WO2011007556A1

WO2011007556A1 - Polar modulator

Info

Publication number: WO2011007556A1
Application number: PCT/JP2010/004540
Authority: WO
Inventors: 森本滋; 石田薫; 中村真木
Original assignee: パナソニック株式会社
Priority date: 2009-07-13
Filing date: 2010-07-13
Publication date: 2011-01-20

Abstract

Disclosed is a polar modulator that performs high efficiency operations and secures excellent modulating characteristics in response to changes in ambient temperature or the temperature of a power amplifier. A signal generator generates a phase signal and an amplitude signal from an input signal. An LDO linear regulator outputs an amplitude signal voltage on the basis of the amplitude signal. A phase modulator phase-modulates the phase signal. The power amplifier amplitude-modulates the phase-modulated phase signal using the amplitude signal voltage supplied by the LDO linear regulator, generating a modulated signal. A temperature sensor measures the ambient temperature or the temperature of the power generator, and outputs the measured temperature as temperature information. Based on the temperature information, a DC/DC output controller outputs a control signal that controls the power supply voltage that drives the LDO linear regulator. A DC/DC converter supplies a power supply voltage based on the control signal to the LDO linear regulator.

Description

Polar modulator

The present invention relates to a power control method and a power control device for a wireless transmitter using a polar modulation circuit, and more specifically, according to changes in the temperature of the power amplifier or the ambient temperature, to ensure good modulation characteristics, The present invention also relates to a polar modulation device that performs high-efficiency operation.

Communication devices such as mobile phones and wireless LANs are required to operate with low power consumption while ensuring the accuracy of transmission signals, regardless of changes in the temperature or ambient temperature of the power amplifier or individual variations. In such a communication device, a transmission circuit that operates with a small size and high efficiency and outputs a highly linear transmission signal is used. A conventional transmission circuit will be described below.

As a conventional transmission circuit, for example, there has been a transmission circuit (hereinafter referred to as an orthogonal modulation circuit) that generates a transmission signal using a modulation method such as orthogonal modulation. Furthermore, a polar modulation circuit is known as a conventional transmission circuit that operates smaller and more efficiently than an orthogonal modulation circuit. In this polar modulation circuit, for example, Patent Documents 1 and 2 are disclosed as those that operate with low power consumption while ensuring the accuracy of a transmission signal.

FIG. 9 is a diagram showing a polar modulation device 900 which is an example of a conventional polar modulation device. 9, a polar modulation device 900 includes a digital block 901, first to third DACs 902 to 904, an offset DAC (hereinafter referred to as OFDAC) 905, an adder 906, a phase modulator 907, a DC / DC A DC converter (hereinafter referred to as DC / DC) 908, first and second LDO linear regulators (hereinafter referred to as LDO) 909 and 910, a power amplifier 911, and a temperature sensor 912 are provided. The digital block 901 includes a signal generation unit 9011 and an offset control unit 9012.

In the digital block 901, the signal generation unit 9011 generates an amplitude signal and a phase signal. The offset control unit 9012 calculates an offset value based on the temperature information Tdet notified from the temperature sensor 912. Here, the temperature sensor 912 measures the temperature of the power amplifier 911 or the ambient temperature, and notifies the digital block 901 of the measured temperature information Tdet.

The amplitude signal generated by the signal generation unit 9011 is input to the adder 906 via the second DAC 903. In the adder 906, the offset value calculated by the offset control unit 9012 is added to the amplitude signal A (t) output from the second DAC 903. The offset value is input to the adder 906 via the OFDAC 905. In the adder 906, the amplitude signal A (t) ′ to which the offset value has been added is input to the first and

second LDOs

909 and 910.

The first and

second LDOs

909 and 910 supply the amplitude signal voltage Vcc controlled according to the input amplitude signal A (t) ′ to the power amplifier 911. Typically, the first and

second LDOs

909 and 910 supply to the power amplifier 911 an amplitude signal voltage Vcc proportional to the magnitude of the input amplitude signal A (t) ′.

The phase signal generated by the signal generation unit 9011 is input to the phase modulator 907 via the third DAC 904. The phase modulator 907 performs phase modulation on the phase signal and outputs a phase modulation signal. The power amplifier 911 amplifies the phase modulation signal with the amplitude signal voltage Vcc supplied from the first and

second LDOs

909 and 910 and outputs the amplified signal as a modulation signal. The signal amplified by the power amplifier 911 is output as a transmission signal from the output terminal. The amplitude level of the modulation signal that is the output of the power amplifier 911 is denoted as Vout.

Next, the relationship between the amplitude signal voltage Vcc supplied from the first and

second LDOs

909 and 910 to the power amplifier 911 and the amplitude level Vout of the modulation signal that is the output of the power amplifier 911 will be described. FIG. 10A is a diagram showing the relationship between the amplitude signal voltage Vcc supplied to the power amplifier 911 at +25 degC and the amplitude level Vout of the modulation signal that is the output of the power amplifier 911. Here, since +25 degC is used as a reference, an offset value is not added to the amplitude signal generated by the signal generation unit 9011. That is, A (t) ′ = A (t). As described above, the first and

second LDOs

909 and 910 control the amplitude signal voltage Vcc supplied to the power amplifier 911 according to the input amplitude signal A (t) ′. Therefore, the amplitude signal voltage Vcc supplied to the power amplifier 911 is controlled according to the amplitude signal A (t) output from the second DAC 903.

FIG. 10B is a diagram showing the relationship between the amplitude signal voltage Vcc supplied to the power amplifier 911 at +125 degC and the amplitude level Vout of the modulation signal that is the output of the power amplifier 911. Here, since it is +125 degC, the offset value calculated by the offset control unit 9012 is added to the amplitude signal generated by the signal generation unit 9011. Specifically, the amplitude signal A (t) ′ shown in FIG. 10B is shifted by +1 mV every +1 degC with respect to the amplitude signal A (t) at +25 degC, which is the reference temperature. That is, the amplitude signal A (t) ′ to which the offset value is added becomes the amplitude signal A (t) + 0.1V output from the second DAC 903. The first and

second LDOs

909 and 910 control the amplitude signal voltage Vcc supplied to the power amplifier 911 according to the input amplitude signal A (t) ′. Thereby, the power amplifier 911 can ensure the same modulation characteristic as the amplitude level Vout of the modulation signal at +25 degC with respect to the amplitude level Vout of the modulation signal at +125 degC.

FIG. 10C is a diagram showing the relationship between the amplitude signal voltage Vcc supplied to the power amplifier 911 at −25 degC and the amplitude level Vout of the modulation signal that is the output of the power amplifier 911. Here, since it is −25 degC, the offset value calculated by the offset control unit 9012 is added to the amplitude signal generated by the signal generation unit 9011. Specifically, the amplitude signal A (t) ′ shown in FIG. 10C is shifted by −1 mV every −1 degC with respect to the amplitude signal A (t) at +25 degC which is the reference temperature. That is, the amplitude signal A (t) ′ to which the offset value is added becomes the amplitude signal A (t) −0.05 V output from the second DAC 903. The first and

second LDOs

909 and 910 control the amplitude signal voltage Vcc supplied to the power amplifier 911 according to the input amplitude signal A (t) ′. As a result, the power amplifier 911 can ensure the same modulation characteristics as the amplitude level Vout of the modulation signal at +25 degC with respect to the amplitude level Vout of the modulation signal at −25 degC.

As described above, in the conventional polar modulation device 900, even when the temperature of the power amplifier 911 or the ambient temperature changes, the amplitude signal generated by the signal generation unit 9011 is changed according to the temperature change by the offset control unit 9012. The offset value calculated in the above is added. That is, as shown in FIGS. 10B and 10C, the amplitude signal A (t) is shifted to A (t) ′. Thereby, the power amplifier 911 ensures the modulation characteristics of the amplitude level Vout of the modulation signal and ensures the accuracy of the transmission signal.

At this time, the DC / DC 908 supplies a constant power supply voltage Vback to the first and

second LDOs

909 and 910. The power supply voltage Vback needs to be determined based on the amplitude signal voltage Vcc supplied from the first and

second LDOs

909 and 910 to the power amplifier 911. If the first and

second LDOs

909 and 910 cannot supply the amplitude signal voltage Vcc corresponding to the amplitude signal A (t) ′ to the power amplifier 911, the modulation of the amplitude level Vout of the modulation signal that is the output of the power amplifier 911 is performed. This is because the characteristics cannot be secured.

Accordingly, the power supply voltage Vback uses the peak voltage Vpeak and the headroom voltage Vhr of the amplitude signal to secure the modulation characteristic of the amplitude level Vout of the modulation signal that is the output of the power amplifier 911. It is determined based on. The headroom voltage Vhr is obtained by saturating the first and

second LDOs

909 and 910 when the amplitude signal voltage Vcc supplied to the power amplifier 911 by the first and

second LDOs

909 and 910 approaches the power supply voltage Vback. It is set to prevent the modulation characteristic of the amplitude level Vout of the modulation signal that is the output of the amplifier 911 from deteriorating.
Vback = Vpeak + Vhr (Equation 1)

As shown in FIGS. 10A to 10C, the peak voltages Vpeak of the amplitude signal A (t) ′ at +25 degC, +125 degC, and −25 degC are VpeakA, VpeakB, and VpeakC, respectively. For example, when VpeakA = 0.9V, VpeakB = 1.0V and VpeakC = 0.85V. Further, when the headroom voltage Vhr = 0.2V, the power supply voltage Vback supplied by the DC / DC 908 is Vback = 1.2V based on VpeakB at +125 degC. That is, the power supply voltage Vback supplied by the DC / DC 908 is determined based on the peak voltage of the amplitude signal A (t) ′ at a high temperature (+125 degC).

Special table 2003-506941 gazette JP 2005-176331 A

However, when the power supply voltage Vback supplied from the DC / DC 908 to the first and

second LDOs

909 and 910 is set to 1.2 V based on the peak voltage VpeakB (1.0 V) at a high temperature (+125 degC), At a low temperature (−25 degC), even when the peak voltage VpeakC (0.85 V) is taken into account, it is sufficient to set the power supply voltage Vback to 1.05 V, so that the operating efficiency is lowered.

Up to this point, when the temperature of the power amplifier 911 or the ambient temperature changes, offset control is performed on the amplitude signal using the adder 906, and the modulation of the amplitude level Vout of the modulation signal that is the output of the power amplifier 911 is performed. An explanation was given to ensure the characteristics. However, when the characteristic of the power amplifier 911 deviates from the standard characteristic at a specific temperature, the amplitude signal may be adjusted using not only the adder 906 but also a multiplier.

FIG. 10D is a diagram showing the relationship between the amplitude signal voltage Vcc supplied to the power amplifier 911 and the amplitude level Vout of the modulation signal that is the output of the power amplifier 911 when adjusting the amplitude signal using a multiplier. In this case, the amplitude signal generated by the signal generation unit 9011 is multiplied by an optimum multiplication coefficient by a multiplier. Specifically, an amplitude signal A (t) ′ obtained by multiplying the amplitude signal A (t) in the standard characteristic of the power amplifier 911 at a predetermined temperature by the multiplication coefficient m = 1.1 is generated. The first and

second LDOs

909 and 910 control the amplitude signal voltage Vcc supplied to the power amplifier 911 according to the input amplitude signal A (t) ′.

As a result, the power amplifier 911 has the modulation signal amplitude level Vout in the standard characteristic of the power amplifier 911 at the predetermined temperature, even if the characteristic of the power amplifier 911 deviates from the standard characteristic at the specific temperature. Similar modulation characteristics are ensured. As described above, when the power supply voltage Vback supplied from the DC / DC 908 to the first and

second LDOs

909 and 910 is set to 1.2 V, the peak voltage VpeakD (0.99 V) is taken into consideration. Since it is sufficient to set the power supply voltage Vback to 1.19 V, the operation efficiency is lowered.

On the other hand, as a result of adjusting the amplitude signal using the multiplier, if the voltage difference between the peak voltage VpeakD and the power supply voltage Vback is small, the first and

second LDOs

909 and 910 are saturated, and the power amplifier The modulation characteristic of the amplitude level Vout of the modulation signal that is the output of 911 cannot be ensured, and distortion occurs.

Further, the conventional field effect transistor (FET) requires two positive and negative power supplies, so that it is difficult to reduce the size. On the other hand, a compound semiconductor material such as GaAs, which is a material for the power amplifier, is expensive, and Miniaturization is desired because it is brittle and easy to break. However, when a small, multi-layered transistor is used as a power amplifier of a wireless transmitter, the heat generated due to the current cannot be dissipated because of the vertically stacked configuration despite the small arrangement area. For this reason, the temperature change becomes large and the input / output characteristics of the transistor are likely to change.

Therefore, an object of the present invention is to provide a good modulation characteristic by controlling the offset of the amplitude signal according to the change of the temperature of the power amplifier or the ambient temperature and at the same time variably controlling the power supply voltage supplied to the LDO. It is an object of the present invention to provide a polar modulation device that ensures high efficiency operation.

In order to achieve the above object, a polar modulation device of the present invention includes a signal generation unit that generates an amplitude signal and a phase signal from an input signal, an LDO linear regulator that outputs an amplitude signal voltage based on the amplitude signal, and a phase A phase modulation unit that phase-modulates the signal, a power amplifier that generates the modulation signal by amplitude-modulating the phase-modulated phase signal using the amplitude signal voltage supplied from the LDO linear regulator as a power supply voltage, and the temperature of the power amplifier or A temperature sensor that measures ambient temperature and outputs it as temperature information, a DC / DC output control unit that outputs a control signal for controlling a power supply voltage for driving the LDO linear regulator according to the temperature information, and a control signal based on the control signal A DC / DC converter for supplying a power supply voltage to the LDO linear regulator.

The polar modulation device includes an offset control unit that calculates an offset value to be added to the amplitude signal according to temperature information, and an adder that adds the offset value calculated by the offset control unit to the amplitude signal generated by the signal generation unit And further comprising.

The offset control unit calculates an offset value to be added to the amplitude signal by multiplying the offset compensation coefficient caused by the temperature variation of the power amplifier by the difference from the reference temperature of the temperature information.

The polar modulator further includes an LUT that stores temperature information and an offset value to be added to the amplitude signal in association with each other. The offset control unit calculates an offset value to be added to the amplitude signal from the LUT according to the temperature information.

The DC / DC output control unit calculates a correction voltage for correcting the power supply voltage for driving the LDO linear regulator according to the offset value, and adds the correction voltage and the peak voltage of the amplitude signal when the temperature information is the reference temperature. The control signal is calculated by adding the headroom voltage of the LDO linear regulator. The DC / DC converter supplies a power supply voltage based on the control signal to the LDO linear regulator.

The DC / DC output control unit uses the increase in the output voltage of the LDO linear regulator due to the addition of the offset value to the amplitude signal as the correction voltage.

The offset control unit calculates a multiplication coefficient for multiplying the amplitude signal based on the temperature information. The polar modulation device further includes a multiplier that multiplies the amplitude signal generated by the signal generation unit by a multiplication coefficient. The adder adds an offset value to the amplitude signal multiplied by the multiplication coefficient.

The offset control unit calculates an offset value by multiplying the offset compensation coefficient caused by the temperature variation of the power amplifier and the difference from the reference temperature of the temperature information, and obtains the gain caused by the temperature variation of the power amplifier. The multiplication coefficient is calculated by multiplying the compensation coefficient by the difference from the reference temperature of the temperature information.

The DC / DC output control unit calculates a correction voltage for correcting the power supply voltage for driving the LDO linear regulator according to the offset value, and corrects the power supply voltage for driving the LDO linear regulator according to the multiplication coefficient. The control signal is calculated by multiplying the peak voltage of the amplitude signal when the temperature information is the reference temperature by the correction coefficient, and adding the correction voltage and the headroom voltage of the LDO linear regulator to the multiplication result. Is calculated. The DC / DC converter supplies a power supply voltage based on the control signal to the LDO linear regulator.

The DC / DC output control unit sets the increase in the output voltage of the LDO linear regulator due to the addition of the offset value to the amplitude signal as the correction voltage, and the multiplication coefficient as the correction coefficient.

The power amplifier is a heterojunction bipolar transistor (HBT / Heterojunction Bipolar Transistor) having a configuration in which different types of semiconductor layers are stacked vertically.

The DC / DC output control unit calculates a correction value for correcting the temperature variation of the DC / DC converter and a correction value for correcting the temperature variation of the headroom voltage of the LDO linear regulator according to the temperature information. Then, the control signal is added by adding the calculated correction value of the DC / DC converter and the correction value of the headroom voltage of the LDO linear regulator to the power supply voltage of the LDO linear regulator when the temperature information is the reference temperature. Is calculated. The DC / DC converter supplies a power supply voltage based on the control signal to the LDO linear regulator.

The polar modulation device is connected to the antenna via the duplexer and the antenna SW, and measures the temperature or ambient temperature of the duplexer and the antenna SW, and outputs a second temperature sensor as second temperature information. Connected. The polar modulation device includes: an offset control unit that calculates a multiplication coefficient to be multiplied to the amplitude signal and an offset value to be added to the amplitude signal according to the temperature information and the second temperature information; and the amplitude generated by the signal generation unit The signal processing apparatus further includes a multiplier that multiplies the signal by a multiplication coefficient, and an adder that adds an offset value to the amplitude signal output from the multiplier.

The polar modulation device includes a gain compensation coefficient caused by temperature variation of the power amplifier, an offset compensation coefficient caused by temperature variation of the power amplifier, and a gain compensation coefficient caused by temperature variation of the duplexer and the antenna SW. A stored LUT is further provided. The offset control unit, from the LUT, compensates the gain due to the temperature variation of the power amplifier, the offset compensation factor due to the temperature variation of the power amplifier, and the gain compensation due to the temperature variation of the duplexer and the antenna SW. The first correction value is calculated by multiplying the difference from the reference temperature of the temperature information by the gain compensation coefficient due to the temperature variation of the power amplifier read from the LUT, and the second correction value is calculated. The second correction value is calculated by multiplying the difference from the reference temperature of the temperature information by the gain compensation coefficient resulting from the temperature variation of the duplexer and the antenna SW read from the LUT, and the reference temperature of the temperature information Is multiplied by the compensation coefficient of the offset value caused by the temperature variation of the power amplifier read from the LUT, thereby obtaining the third correction value. Calculated by using the first correction value and a second correction value to calculate a multiplication coefficient, and calculates an offset value using the third correction value.

In the LUT, a plurality of gain compensation coefficients caused by temperature variations of the power amplifier and offset compensation coefficients caused by temperature variations of the power amplifier are set in accordance with the temperature information, and temperature variations of the duplexer and the antenna SW are set. A plurality of gain compensation coefficients resulting from the above may be set according to the second temperature information. The offset control unit reads, from the LUT, the gain compensation coefficient caused by the temperature variation of the power amplifier and the offset compensation coefficient caused by the temperature variation of the power amplifier according to the temperature information, and uses them as the second temperature information. In response, the gain compensation coefficient due to the temperature variation of the duplexer and the antenna SW is read out.

The polar modulation device measures the temperature or ambient temperature of the LDO linear regulator and outputs a third temperature sensor that outputs the temperature information as third temperature information, and a multiplication that multiplies the amplitude signal according to the temperature information and the third temperature information. An offset control unit that calculates a coefficient and an offset value to be added to the amplitude signal, a multiplier that multiplies the amplitude signal generated by the signal generation unit by a multiplication coefficient, and an offset to the amplitude signal output from the multiplier And an adder for adding values.

The polar modulation device includes a gain compensation coefficient caused by temperature variation of the power amplifier, an offset compensation coefficient caused by temperature variation of the power amplifier, a gain compensation coefficient caused by temperature variation of the LDO linear regulator, and an LDO linear Further provided is an LUT that stores a compensation coefficient for offset caused by temperature variation of the regulator. The offset control unit, from the LUT, gain compensation coefficient due to power amplifier temperature variation, offset compensation coefficient due to power amplifier temperature variation, and gain compensation coefficient due to LDO linear regulator temperature variation, The offset compensation coefficient caused by the temperature variation of the LDO linear regulator is read, and the difference from the reference temperature of the temperature information is multiplied by the gain compensation factor caused by the temperature variation of the power amplifier read from the LUT. The first correction value is calculated, and the second correction value is calculated by multiplying the difference from the reference temperature of the temperature information by the compensation coefficient of the offset value caused by the temperature variation of the power amplifier read from the LUT. The calculated difference from the reference temperature of the third temperature information and the LDO linear regulation read from the LUT The third correction value is calculated by multiplying the gain compensation coefficient caused by the temperature variation of the data, the difference from the reference temperature of the third temperature information, and the temperature variation of the LDO linear regulator read from the LUT The fourth correction value is calculated by multiplying the offset compensation coefficient caused by the first correction value, the multiplication coefficient is calculated using the first correction value and the third correction value, and the second correction value is calculated. The offset value is calculated using the value and the fourth correction value.

In the LUT, a plurality of gain compensation coefficients due to power amplifier temperature variations and offset compensation coefficients due to power amplifier temperature variations are set in accordance with temperature information, resulting from temperature variations in the LDO linear regulator. A plurality of gain compensation coefficients and offset compensation coefficients caused by temperature variations of the LDO linear regulator may be set according to the third temperature information. The offset control unit reads, from the LUT, the gain compensation coefficient caused by the temperature variation of the power amplifier and the offset compensation coefficient caused by the temperature variation of the power amplifier in accordance with the temperature information, and uses them as the third temperature information. In response, the gain compensation coefficient caused by the temperature variation of the LDO linear regulator and the offset compensation coefficient caused by the temperature variation of the LDO linear regulator are read out.

The polar modulator further includes a third temperature sensor that measures the temperature or ambient temperature of the LDO linear regulator and outputs the measured temperature information as third temperature information. The offset control unit calculates an offset value and a multiplication coefficient according to the temperature information, the second temperature information, and the third temperature information.

The polar modulation device includes a gain compensation coefficient caused by temperature variation of the power amplifier, an offset compensation coefficient caused by temperature variation of the power amplifier, a gain compensation coefficient caused by temperature variation of the duplexer and the antenna SW, It further includes an LUT that stores a gain compensation coefficient caused by temperature variation of the LDO linear regulator and an offset compensation coefficient caused by temperature variation of the LDO linear regulator. The offset control unit, from the LUT, compensates the gain due to the temperature variation of the power amplifier, the offset compensation factor due to the temperature variation of the power amplifier, and the gain compensation due to the temperature variation of the duplexer and the antenna SW. The coefficient, the gain compensation coefficient due to the temperature variation of the LDO linear regulator, and the offset compensation coefficient due to the temperature variation of the LDO linear regulator are read, the difference from the reference temperature of the temperature information, and the power read from the LUT The first correction value is calculated by multiplying the gain compensation coefficient caused by the temperature variation of the amplifier, and the difference from the reference temperature of the temperature information and the offset caused by the temperature variation of the power amplifier read from the LUT The second correction value is calculated by multiplying the compensation coefficient of the value, and the second temperature information is calculated. The third correction value is calculated by multiplying the difference from the reference temperature by the gain compensation coefficient resulting from the temperature variation of the duplexer and the antenna SW read from the LUT, and the third temperature information reference The fourth correction value is calculated by multiplying the difference from the temperature by the gain compensation coefficient resulting from the temperature variation of the LDO linear regulator read from the LUT, and the difference from the reference temperature in the third temperature information And the offset compensation coefficient caused by the temperature variation of the LDO linear regulator read from the LUT, the fifth correction value is calculated, and the first correction value, the third correction value, The multiplication coefficient is calculated using the correction value of 4, and the offset value is calculated using the second correction value and the fifth correction value.

In the LUT, a plurality of gain compensation coefficients resulting from temperature variations of the power amplifier and offset compensation coefficients resulting from temperature variations of the power amplifier are set according to the temperature information. A plurality of gain compensation coefficients are set according to the second temperature information, and the gain compensation coefficient due to the temperature variation of the LDO linear regulator and the offset compensation coefficient due to the temperature variation of the LDO linear regulator are the first. A plurality may be set according to the temperature information of 3. The offset control unit reads, from the LUT, the gain compensation coefficient caused by the temperature variation of the power amplifier and the offset compensation coefficient caused by the temperature variation of the power amplifier according to the temperature information, and uses them as the second temperature information. Accordingly, the gain compensation coefficient due to the temperature variation of the duplexer and the antenna SW is read out, and the gain compensation coefficient due to the temperature variation of the LDO linear regulator and the temperature of the LDO linear regulator according to the third temperature information Read out the offset compensation coefficient caused by the variation.

The DC / DC output control unit calculates a correction voltage for correcting the power supply voltage for driving the LDO linear regulator and a correction value for correcting the temperature variation of the DC / DC converter according to the temperature information, and the temperature information, The correction coefficient for correcting the power supply voltage for driving the LDO linear regulator is calculated according to the second temperature information, and the temperature variation of the headroom voltage of the LDO linear regulator is corrected according to the second temperature information. The correction value is calculated, the peak voltage of the amplitude signal when the temperature information is the reference temperature is multiplied by the correction coefficient, the multiplication result is corrected, the headroom voltage of the LDO linear regulator, and the calculated The control signal is obtained by adding the correction value of the DC / DC converter and the correction value of the headroom voltage of the LDO linear regulator. Calculated to. The DC / DC converter supplies a power supply voltage based on the control signal to the LDO linear regulator.

The DC / DC output control unit adds the first correction value obtained by multiplying the amplitude signal by the offset compensation coefficient caused by the temperature variation of the power amplifier and the difference from the reference temperature of the temperature information. The second correction value obtained by multiplying the increase of the output voltage of the linear regulator as a correction voltage, the gain compensation coefficient resulting from the temperature variation of the power amplifier, and the difference from the reference temperature of the temperature information, a duplexer, and A result obtained by multiplying the gain compensation coefficient caused by the temperature variation of the antenna SW and the third correction value obtained by multiplying the difference from the reference temperature of the second temperature information is defined as a correction coefficient.

As described above, according to the present invention, good modulation is achieved by performing offset control on the amplitude signal and variably controlling the power supply voltage supplied to the LDO according to changes in the temperature of the power amplifier or the ambient temperature. It is possible to realize a polar modulation device that secures characteristics and performs high-efficiency operation.

FIG. 1A is a diagram illustrating a polar modulation device 100 according to a first embodiment of the present invention. FIG. 1B is a diagram showing a polar modulation device 100b according to the first embodiment of the present invention. FIG. 1C is a diagram illustrating an example of an LUT in which temperature information Tdet is associated with an offset value. FIG. 1D is a diagram illustrating an example of an LUT in which temperature information Tdet and correction voltage Vdcdc are associated with each other. FIG. 2 is a flowchart showing the operation of the digital block 101. FIG. 3A is a diagram illustrating a polar modulation device 200 according to the second embodiment of the present invention. FIG. 3B is a diagram illustrating a polar modulation device 200b according to the second embodiment of the present invention. FIG. 3C is a diagram illustrating an example of an LUT in which the temperature information Tdet and the correction coefficient Gdcdc are associated with each other. FIG. 4A shows a polar modulation device 300 according to the third embodiment of the present invention. FIG. 4B is a diagram illustrating a polar modulation device 300b according to the third embodiment of the present invention. FIG. 4C is a diagram illustrating a polar modulation device 300c according to the third embodiment of the present invention. FIG. 5A is a diagram illustrating an example of a loss that occurs in the duplexer 600. FIG. 5B is a diagram for explaining the cause of the characteristic variation that may occur in each part of the polar modulation system. FIG. 6A is a diagram illustrating an example of the temperature coefficient stored in the LUT 302. FIG. 6B is a diagram illustrating an example of the temperature coefficient stored in the LUT 302. FIG. 6C is a diagram illustrating an example of the temperature coefficient stored in the LUT 302. FIG. 7A is a diagram illustrating a configuration of a polar modulation system including a polar modulation device 400 according to the fourth embodiment of the present invention. FIG. 7B is a diagram illustrating a configuration of a polar modulation system including the polar modulation device 400b according to the fourth embodiment of the present invention. FIG. 8A is a diagram illustrating an example of the temperature coefficient stored in the LUT 402. FIG. 8B is a diagram illustrating an example of the temperature coefficient stored in the LUT 402. FIG. 9 is a diagram illustrating a polar modulator 900 which is an example of a conventional polar modulator. FIG. 10A is a diagram showing the relationship between the amplitude signal voltage Vcc supplied to the power amplifier 911 at +25 degC and the amplitude level Vout of the modulation signal that is the output of the power amplifier 911. FIG. 10B is a diagram showing the relationship between the amplitude signal voltage Vcc supplied to the power amplifier 911 at +125 degC and the amplitude level Vout of the modulation signal that is the output of the power amplifier 911. FIG. 10C is a diagram showing the relationship between the amplitude signal voltage Vcc supplied to the power amplifier 911 at −25 degC and the amplitude level Vout of the modulation signal that is the output of the power amplifier 911. FIG. 10D is a diagram illustrating a relationship between the amplitude signal voltage Vcc supplied to the power amplifier 911 and the amplitude level Vout of the modulation signal that is the output of the power amplifier 911 when offset control is performed using a multiplier.

Hereinafter, each embodiment of the present invention will be described with reference to the drawings.
<First Embodiment>
FIG. 1A is a diagram illustrating a polar modulation device 100 according to a first embodiment of the present invention. In FIG. 1A, a polar modulation device 100 includes a digital block 101, first to third DACs 102 to 104, an OFDAC 105, an adder 106, a phase modulator 107, a DC / DC 108, a first and a second.

LDOs

109 and 110, a power amplifier (PA) 111, and a temperature sensor 112 are provided. The digital block 101 includes a signal generation unit 1011, an offset control unit 1012, and a DC / DC output control unit 1013.

In the digital block 101, the signal generation unit 1011 generates an amplitude signal and a phase signal. The offset control unit 1012 calculates an offset value based on the temperature information Tdet notified from the temperature sensor 112. Here, the temperature sensor 112 measures the temperature of the power amplifier 111 or the ambient temperature, and notifies the digital block 101 of the measured temperature information Tdet.

The amplitude signal generated by the signal generation unit 1011 is input to the adder 106 via the second DAC 103. In the adder 106, the offset value calculated by the offset control unit 1012 is added to the amplitude signal A (t) output from the second DAC 103. Note that the offset value is input to the adder 106 via the OFDAC 105. In the adder 106, the amplitude signal A (t) ′ added with the offset value is input to the first and

second LDOs

109 and 110.

Note that, like the polar modulation device 100b shown in FIG. 1B, the adder 106 is arranged between the digital block 101 and the second DAC 103, and adds an offset value to the amplitude signal A (t) in the digital domain. You may do.

The first and

second LDOs

109 and 110 supply the amplitude signal voltage Vcc controlled according to the input amplitude signal A (t) ′ to the power amplifier 111.

In addition, the phase signal generated by the signal generation unit 1011 is input to the phase modulator 107 via the third DAC 104. The phase modulator 107 performs phase modulation on the phase signal and outputs a phase modulation signal. The power amplifier 111 amplifies the phase modulation signal with the amplitude signal voltage Vcc supplied from the first and

second LDOs

109 and 110 and outputs the amplified signal as a modulation signal. The signal amplified by the power amplifier 111 is output as a transmission signal from the output terminal.

Also in the polar modulation device 100 according to the first embodiment of the present invention, as shown in FIGS. 10A to 10C, the amplitudes at +125 degC and −25 degC with respect to A (t) at +25 degC that is the reference temperature. The signal A (t) is shifted to A (t) ′.

The basic operation of the polar modulation device 100 according to the first embodiment of the present invention described so far is the same as that of the conventional polar modulation device 900 shown in FIG. 9, but the first embodiment of the present invention. In the polar modulation device 100 according to the above, the power supply voltage Vback supplied from the DC / DC 108 to the first and

second LDOs

109 and 110 is not constant. The power supply voltage Vback supplied from the DC / DC 108 to the first and

second LDOs

109 and 110 will be described below.

In the polar modulation device 100 according to the first embodiment of the present invention, the digital block 101 further includes a DC / DC output control unit 1013 in addition to the signal generation unit 1011 and the offset control unit 1012. FIG. 2 is a flowchart showing the operation of the digital block 101. In FIG. 2, the digital block 101 includes a temperature information acquisition command step S201, a temperature information acquisition step S202, an offset value calculation step S203, an offset value output step S204, a correction voltage calculation step S205, and a correction voltage output step S206. And execute.

In the temperature information acquisition command step S201, the control unit (not shown) of the digital block 101 acquires the temperature information Tdet from the temperature sensor 112 to the offset control unit 1012 and the DC / DC output control unit 1013. Instruct.

In the temperature information acquisition step S202, the offset control unit 1012 and the DC / DC output control unit 1013 acquire the temperature information Tdet notified from the temperature sensor 112 based on the instruction from the control unit in the temperature information acquisition command step S201. .

In the offset value calculation step S203, the offset control unit 1012 calculates an offset value to be added to the amplitude signal generated by the signal generation unit 1011 based on the temperature information Tdet notified from the temperature sensor 112. Here, for example, as calculated by the offset control unit 9012 of the conventional polar modulation device 900, the offset value is calculated as a value that causes the amplitude signal generated by the signal generation unit 1011 to be shifted by +1 mV every +1 degC. The The polar modulation device 100 may hold in advance a lookup table (LUT) in which the temperature information Tdet is associated with the offset value (see, for example, FIG. 1C). Further, in the LUT, instead of the temperature information Tdet, a difference (Tdet−Tdet0) between the temperature information Tdet and the reference value Tdet0 of the temperature information may be used.

In the offset value output step S204, the offset control unit 1012 outputs the offset value calculated in the offset value calculation step S203 to the OFDAC 105.

On the other hand, in the correction voltage calculation step S205, the DC / DC output control unit 1013 calculates the correction voltage Vdcdc based on the temperature information Tdet notified from the temperature sensor 112. Here, the correction voltage Vdcdc is calculated by the following (Equation 2) using the temperature coefficient k (V / degC), the temperature information Tdet (degC), and the reference value Tdet0 (degC) of the temperature information. . Here, the reference value of the temperature information may be described as a reference temperature.
Vdcdc = k × (Tdet−Tdet0) (Equation 2)

In the correction voltage output step S206, the DC / DC output control unit 1013 outputs a control signal corresponding to the correction voltage Vdcdc calculated in the correction voltage calculation step S205 to the first DAC 102.

A control signal corresponding to the correction voltage Vdcdc is input to the DC / DC 108 via the first DAC 102. The DC / DC 108 supplies the power supply voltage Vback to the first and

second LDOs

109 and 110 based on the peak voltage Vpeak0 at the temperature information reference value Tdet0 and the correction voltage Vdcdc. Here, the peak voltage Vpeak of (Equation 1) described above is calculated by the following (Equation 3).
Vpeak = Vpeak0 + Vdcdc (Equation 3)

For example, the temperature information reference value Tdet0 = + 25 degC and the temperature coefficient k = 1 mV / degC will be specifically described below. As shown in FIG. 10A, since the reference value of the temperature information (Tdet0 = + 25 degC), the peak voltage Vpeak0 = VpeakA (0.9 V) at the reference value Tdet0 of the temperature information.

10A, in the case of +25 degC, since Tdet = + 25 degC, Vdcdc = 0V. Here, the correction voltage Vdcdc = 0V is input to the DC / DC 108 via the first DAC 102. In the DC / DC 108, since the correction voltage Vdcdc = 0V, the peak voltage Vpeak in (Expression 1) is set to the above-described peak voltage Vpeak0 (0.9V). Therefore, from (Equation 1), from the peak voltage Vpeak (0.9 V) and the headroom voltage Vhr (0.2 V), the DC / DC 108 supplies the power supply voltage Vback (1.1 V) to the first and

second LDOs

109 and 110.

10B, in the case of +125 degC, since Tdet = + 125 degC, Vdcdc = + 0.1V. Here, the correction voltage Vdcdc = + 0.1 V is input to the DC / DC 108 via the first DAC 102. In the DC / DC 108, since the correction voltage Vdcdc = + 0.1 V, the peak voltage Vpeak in (Equation 1) is set to 1.0 V from the above-described peak voltage Vpeak0 (0.9 V) + Vdcdc (0.1 V). Therefore, from (Equation 1), from the peak voltage Vpeak (1.0 V) and the headroom voltage Vhr (0.2 V), the DC / DC 108 supplies the power supply voltage Vback (1.2 V) to the first and

second LDOs

109 and 110.

From FIG. 10C, in the case of −25 degC, since Tdet = −25 degC, Vdcdc = −0.05V. Here, the correction voltage Vdcdc = −0.05 V is input to the DC / DC 108 via the first DAC 102. Since the correction voltage Vdcdc = −0.05 V in the DC / DC 108, the peak voltage Vpeak in (Equation 1) is 0.85 V from the above-described peak voltage Vpeak0 (0.9 V) + Vdcdc (−0.05 V). To do. Therefore, from (Equation 1), from the peak voltage Vpeak (0.85 V) and the headroom voltage Vhr (0.2 V), the DC / DC 108 supplies the power supply voltage Vback (1.05 V) to the first and

second LDOs

109 and 110.

As described above, the DC / DC output control unit 1013 changes the power supply voltage Vback that the DC / DC 108 supplies to the first and

second LDOs

109 and 110 according to the change in the temperature of the power amplifier 111 or the ambient temperature.

Note that, in the correction voltage calculation step S205, the DC / DC output control unit 1013 calculates the correction voltage Vdcdc according to the above-described (Equation 2), but the DC / DC output control unit 1013 includes the temperature information Tdet and the correction voltage. A lookup table (LUT) associated with Vdcdc may be held (see, for example, FIG. 1D). Further, in the LUT, instead of the temperature information Tdet, a difference (Tdet−Tdet0) between the temperature information Tdet and the reference value Tdet0 of the temperature information may be used.

As described above, according to the polar modulation device 100 according to the first embodiment of the present invention, the offset control unit 1012 performs offset control on the amplitude signal simultaneously with the change in the temperature of the power amplifier or the ambient temperature. The DC / DC output control unit 1013 controls the correction voltage Vdcdc, and the DC / DC 108 variably controls the power supply voltage Vback supplied to the first and

second LDOs

109 and 110, thereby ensuring good modulation characteristics. In addition, highly efficient operation can be performed.

In the polar modulation device 100 according to the present embodiment, the power amplifier 111 may be a heterojunction bipolar transistor (HBT) having a configuration in which different types of semiconductor layers are vertically stacked. Since the HBT uses a junction (heterojunction) in which a plurality of electrodes are arranged in the vertical direction and different semiconductor layers are stacked, the arrangement area is small compared to a bipolar transistor having a normal structure. Therefore, the power amplifier 111 can prevent output distortion of the power amplifier caused by heat while reducing the circuit scale. For this reason, the polar modulation device 100 according to the first embodiment of the present invention can ensure better modulation characteristics. In addition, since the HTB has a configuration in which a collector electrode, a base electrode, and an emitter electrode are stacked in the vertical direction, the arrangement area can be reduced, and the cost can be reduced by reducing the size of an expensive GaAs substrate.

In the present embodiment, the correction voltage Vdcdc is the same as the offset value. However, the correction voltage Vdcdc is not necessarily limited to this, and the correction voltage Vdcdc may be different from the offset value.

<Second Embodiment>
FIG. 3A is a diagram illustrating a polar modulation device 200 according to the second embodiment of the present invention. 3A, the polar modulation device 200 includes a digital block 101, first to third DACs 102 to 104, an OFDAC 105, an adder 106, a phase modulator 107, a DC / DC 108, a first and a second.

LDOs

109 and 110, a power amplifier 111, a temperature sensor 112, and a multiplier 201 are provided. The digital block 101 includes a signal generation unit 1011, an offset control unit 1012, and a DC / DC output control unit 1013. In FIG. 3A, the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

As in the polar modulation device 200b shown in FIG. 3B, the adder 106 is arranged between the multiplier 201 and the second DAC 103, and adds an offset value to the amplitude signal A (t) in the digital domain. It may be. Although not shown, both the adder 106 and the multiplier 201 may be arranged in the analog region.

The polar modulation device 200 according to the second embodiment of the present invention is different from the polar modulation device 100 according to the first embodiment in that a multiplier 201 is provided. As shown in FIG. 10D, the offset control unit 1012 adjusts the amplitude signal using the multiplier 201 when the characteristic of the power amplifier 111 deviates from the standard characteristic at a specific temperature. Thereby, the characteristic of the power amplifier 111 is corrected. The DC / DC output control unit 1013 calculates a correction coefficient Gdcdc, which is an adjustment value from the standard characteristics, and outputs it to the first DAC 102.

The correction coefficient Gdcdc is input to the DC / DC 108 via the first DAC 102. The DC / DC 108 is based on the peak voltage Vpeak0 of the amplitude signal in the standard characteristic and the correction coefficient Gdcdc that is an adjustment value from the standard characteristic when the characteristic of the power amplifier 111 deviates from the standard characteristic at the specific temperature. Thus, the power supply voltage Vback is supplied to the first and

second LDOs

109 and 110.

Here, the correction coefficient Gdcdc is calculated by the following (Equation 2) ′ using the temperature coefficient j (degC ⁻¹ ), the temperature information Tdet (degC), and the reference value Tdet0 (degC) of the temperature information. The
Gdcdc = j × (Tdet−Tdet0) (Equation 2) ′

The DC / DC 108 supplies the power supply voltage Vback to the first and

second LDOs

109 and 110 based on the peak voltage Vpeak0 at the temperature information reference value Tdet0 and the correction coefficient Gdcdc. Here, the peak voltage Vpeak of (Equation 1) described above is calculated by the following (Equation 3) ′.
Vpeak = Vpeak0 × Gdcdc (Equation 3) ′

For example, a case where the temperature information reference value Tdet0 = + 25 degC and the temperature coefficient j = 0.111 degC ⁻¹ will be specifically described below. As shown in FIG. 10D, when the intercept with respect to the amplitude control voltage Vcc is 0.1 V and the temperature information reference value Tdet0 = + 25 degC, the peak voltage Vpeak0 at the temperature information reference value Tdet0 is 1.0 V. Become. Here, when the temperature changes to the specific temperature +125 degC, Tdet = + 125 degC, so that Gdcdc = 1.1. As a result, Vpeak is calculated to be 1.09 V (= 0.1 V + 0.9 V × 1.1), and Vback is calculated and output by applying Vpeak to (Equation 1).

As described above, when the characteristic of the power amplifier 111 becomes a specific characteristic deviating from the standard characteristic at the specific temperature, the DC / DC output control unit 1013 causes the DC / DC 108 to change the first and second in accordance with the specific characteristic. The power supply voltage Vback supplied to the

LDOs

109 and 110 is changed. The polar modulation device 200 may hold in advance a lookup table (LUT) in which the temperature information Tdet and the correction coefficient Gdcdc are associated (see, for example, FIG. 3C). Further, in the LUT, instead of the temperature information Tdet, a difference (Tdet−Tdet0) between the temperature information Tdet and the reference value Tdet0 of the temperature information may be used.

As described above, according to the polar modulation device 200 according to the second embodiment of the present invention, the offset control unit 1012 multiplies the amplitude signal with respect to the amplitude signal according to the change in the temperature of the power amplifier 111 or the ambient temperature. Simultaneously with the offset control using 201, the DC / DC output control unit 1013 controls the correction coefficient Gdcdc, and the DC / DC 108 variably controls the power supply voltage Vback supplied to the first and

second LDOs

109 and 110. Good modulation characteristics can be ensured and highly efficient operation can be performed.

Note that the polar modulation device 200 according to the second embodiment of the present invention can also be used for process adjustment in the manufacturing stage. In addition, the polar modulation device used for the process adjustment does not variably control the power supply voltage Vback supplied from the DC / DC 108 to the first and

second LDOs

109 and 110 in accordance with a change in the temperature of the power amplifier 111 or the ambient temperature. Alternatively, the power supply voltage Vback supplied from the DC / DC 108 to the first and

second LDOs

109 and 110 may be adjusted in advance according to the characteristics (individual variation) of the power amplifier 111.

<Third Embodiment>
FIG. 4A is a diagram illustrating a configuration of a polar modulation system including a polar modulation device 300 according to the third embodiment of the present invention. In FIG. 4A, polar modulator 300 is connected to antenna 602 via duplexer 600 and antenna switch (601) 601. In addition, a temperature sensor 603 is installed in the vicinity of the duplexer 600 and the antenna SW 601.

In the open-loop polar modulation system as shown in FIG. 4A, a loss has occurred between the duplexer 600 and the antenna SW601. Even if the power is increased in consideration of the loss, since the loss varies depending on the temperature (that is, the characteristics of the duplexer 600 and the antenna SW 601 vary depending on the temperature), the power that cannot be ignored at the end of the antenna 602 There was a risk of fluctuations. FIG. 5A is a diagram illustrating an example of a loss that occurs in the duplexer 600. In the example shown in FIG. 5A, as the temperature rises, the loss generated in the duplexer 600 increases, and the rate of increase in loss also changes when the temperature is +25 degC. Although not shown, the antenna SW601 also has a similar tendency of loss. For this reason, when the loss increases due to the temperature rise, the power is lowered, and there is a possibility that the specification lower limit such as 3GPP may not be satisfied. Conversely, there is a risk that the power will not satisfy the upper limit of the specification at low temperatures.

FIG. 5B is a diagram for explaining the cause of temperature variation occurring in each part of the polar modulation system. Referring to FIG. 5B, Vback output from DC / DC 108 may include a DC / DC offset error eO _DCDC . Further, the headroom voltage Vhr may include a headroom voltage offset error eOhr. The Vcc output from the

LDOs

109 and 110 may include an LDO gain error eG _LDO and an LDO offset error eO _LDO . Further, the output Vout of the power amplifier 111 may include a gain error eG _PA of the power amplifier and an offset error eO _PA of the power amplifier. Further, the output Vout2 of the duplexer 600 and the antenna SW601 are likely to include the gain errors _{eG SD} duplexer and antenna SW. Among these, the third embodiment describes a configuration that compensates for the gain error eG _PA of the power amplifier, the offset error eO _PA of the power amplifier, and the gain error eG _SD of the duplexer and the antenna SW.

The polar modulation device 300 according to the third embodiment corrects the temperature characteristics of the duplexer 600 and the antenna SW 601 in addition to the temperature characteristics of the power amplifying unit 111 with the following configuration, and performs power fluctuation at the end of the antenna 602. To prevent. The polar modulation device 300 includes a digital block 301, first to third DACs 102 to 104, an OFDAC 105, an adder 106, a phase modulator 107, a DC / DC 108, first and

second LDOs

109 and 110, , A power amplifier 111, a temperature sensor 112, a multiplier 201, and a lookup table (LUT) 302. The digital block 301 includes a signal generation unit 1011, an offset control unit 3012, and a DC / DC output control unit 3013. In FIG. 4A, the same components as those in the first and second embodiments are denoted by the same reference numerals, and the description thereof is omitted.

4B, the adder 106 is disposed between the multiplier 201 and the second DAC 103, and adds an offset value to the amplitude signal A (t) in the digital domain. It may be. Although not shown, both the adder 106 and the multiplier 201 may be arranged in the analog region.

In the digital block 301, the signal generation unit 1011 generates an amplitude signal and a phase signal. The offset control unit 3012 adjusts the amplitude signal using the multiplier 201 and the adder 106 when the characteristic of the amplitude level Vout2 of the modulation signal from the antenna 602 deviates from the standard characteristic at the specific temperature. Specifically, the offset control unit 3012, based on the temperature information Tdsw notified from the temperature sensor 603 in addition to the temperature information Tdet notified from the temperature sensor 112, a multiplication coefficient a set in the multiplier 201, An offset value b set in the adder 106 is calculated. Here, the temperature sensor 112 measures the temperature of the power amplifier 111 or the ambient temperature, and notifies the digital block 301 of the measured temperature information Tdet. The temperature sensor 603 measures the temperature of the duplexer 600 and the antenna SW 601 or the ambient temperature, and notifies the digital block 301 of the measured temperature information Tdet_SD. It is assumed that there is almost no difference in temperature between duplexer 600 and antenna SW601.

Here, the reference value of the temperature information is room temperature, and Tdet0 = + 25 degC and Tdet0_SD = + 25 degC. At this time, the amplitude level Vout2 of the modulation signal from the antenna 602 is obtained by using the attenuation factor n in the duplexer 600 and the antenna SW601 and the amplitude level Vout of the modulation signal that is the output of the power amplifier 111 (Equation 4). Is represented by In addition, when the power amplifier is used in the saturation region, the relationship of the amplitude level Vout of the output modulation signal with respect to the power supply voltage is expressed by using only the zero-order component (offset O _PA ) and the first-order component (amplification factor m). In simple terms, (Expression 5) is obtained. Vcc is expressed by (Equation 6) using the amplification factor h of the

LDOs

109 and 110. A (t) ′ is expressed by (Equation 7) using the multiplication coefficient a and the offset value b.
Vout2 = n · Vout (Expression 4)
Vout = m · (Vcc−O _PA ) (Expression 5)
Vcc = h · A (t) ′ (Expression 6)
A (t) ′ = a · A (t) + b (Expression 7)

Further, A (t) ′ is expressed by (Equation 8) in consideration of temperature changes of the power amplifier 111, the duplexer 600, and the antenna SW601. Here, the coefficients (correction values) cG _PA , cG _SD , and cO _PA used in (Equation 8) are expressed by (Equation 9) to (Equation 11). Here, C _GPA is a gain compensation coefficient of the power amplifier 111 due to temperature variation of the power amplifier 111. C _GSD is a compensation coefficient of the gain of the duplexer 600 and the antenna SW601 due to the temperature variation of the duplexer 600 and the antenna SW601. C _OPA is a compensation coefficient for offset of the power amplifier 111 caused by temperature variation of the power amplifier 111.
A (t) ′ = cG _PA × cG _SD × A (t) + cO _PA (Equation 8)
cG _PA = 1 / eG _PA
= C _GPA x (Tdet-Tdet0) (Equation 9)
cG _SD = 1 / eG _SD
= C _GSD × (Tdet_SD−Tdet0_SD) (Equation 10)
cO _PA = -1 / h × eO _PA
= 1 / h x C _OPA x (Tdet-Tdet0) (Equation 11)

Next, when the multiplication coefficient a and the offset value b of (Expression 7) are calculated using (Expression 8) to (Expression 11), the multiplication coefficient a is calculated using (Expression 12) and the offset value b is (Expression 13) can be used.
a = cG _SD × cG _PA (Equation 12)
b = cO _PA (Expression 13)

The LUT 302 stores in advance a compensation coefficient C _GPA for the gain of the power amplifier 111, a temperature compensation coefficient C _OPA for the offset of the power amplifier 111, and a compensation coefficient C _GSD for the gain of the duplexer 600 and the antenna SW601 (for example, FIG. 6A). Note that the compensation coefficients C _GPA , C _OPA , and C _GSD may change according to the temperature information (see, for example, FIG. 6B). This is because, as shown in FIG. 5, the rate of increase in loss generated in the duplexer 600, the antenna SW601, and the like changes according to the temperature. Referring to FIG. 6B, offset control unit 3012 uses compensation coefficients C _{GPA1 and} C _OPA1 when temperature information Tdet_SD from temperature sensor 112 is below room temperature, and temperature information Tdet_SD from temperature sensor 603 is below room temperature. Sometimes the compensation factor C _GSD1 is used. The temperature information Tdet_SD from the temperature sensor 112 using a compensation coefficient _{_C GPA2, C} _OPA2 at room temperature or higher temperature information Tdet_SD from the temperature sensor 603 uses the compensation factor _{C GSD2} at room temperature or higher.

Here, in consideration of temperature changes of the power amplifier 111, the duplexer 600, and the antenna SW601, the power supply voltage Vback is corrected by (Equation 14).
Vback = Gdcdc × Vpeak0 + Vdcdc + Vhr
(Equation 14)

Further, the DC / DC output control unit 3013, when the characteristic of the amplitude level Vout2 of the modulation signal from the antenna 602 is a specific characteristic that deviates from the standard characteristic, the correction coefficient Gdcdc that is an adjustment value from the standard characteristic, and the correction voltage Vdcdc. Is calculated and output to the first DAC 102. Here, the correction coefficient Gdcdc and the correction voltage Vdcdc are calculated from (Equation 15) and (Equation 16). From (Equation 12) and (Equation 13), the correction coefficient Gdcdc and the correction voltage Vdcdc are expressed as (Equation 17) and (Equation 18) using the multiplication coefficient a and the offset value b.
Gdcdc = cGPA × cGSD (Equation 15)
Vdcdc = h × cOPA (Expression 16)
Gdcdc = a (Expression 17)
Vdcdc = h × b (Equation 18)

In the above description, it is assumed that there is almost no difference in temperature between duplexer 600 and antenna SW601. However, when a temperature difference between duplexer 600 and antenna SW601 is assumed, a polar modulation system is used. Can also include a temperature sensor 6031 that measures the temperature of the duplexer 600 or the ambient temperature and a temperature sensor 6032 that measures the temperature of the antenna SW 601 or the ambient temperature (see, for example, FIG. 4C). In this case, the offset control unit 3012 uses the multiplier based on the temperature information Tdet notified from the temperature sensor 112, the temperature information Tdet_D notified from the temperature sensor 6031, and the temperature information Tdet_S notified from the temperature sensor 6032. The multiplication coefficient a set to 201 and the offset value b set to the adder 106 can be calculated. Further, LUT 302 includes a compensation coefficient _{C GPA} in the gain of the power amplifier 111, a compensation coefficient _{C GSD_D} gain duplexer 600 may also store the compensation coefficients _{C GSD_S} gain antenna SW601 advance (for example, FIG. 6C).

As described above, the polar modulation device 300 according to the third embodiment sets the multiplication coefficient a in the multiplier 201 when the temperature of the power amplifier 111, the duplexer 600, and the antenna SW601 changes, and the adder 106 By setting the offset value b, in addition to the temperature characteristics of the power amplifier 111, the temperature characteristics of the duplexer 600 and the antenna SW601 can be corrected, and power fluctuation at the end of the antenna 602 can be prevented.

(Fourth embodiment)
In the fourth embodiment, the duplexer and antenna SW gain error eG _SD , DC / DC offset error eO _DCDC , headroom voltage offset error eOhr, and LDO gain error described with reference to FIG. 5B are used. This configuration compensates for an eG _LDO , an LDO offset error eO _LDO , a power amplifier gain error eG _PA, and a power amplifier offset error eO _PA . In the following, a configuration in which the polar modulation device 400 compensates for all these errors will be described. However, a configuration in which one of these errors or a combination of a plurality of these errors is compensated may be employed.

FIG. 7A is a diagram illustrating a configuration of a polar modulation system including a polar modulation device 400 according to the fourth embodiment of the present invention. In FIG. 7A, a polar modulation device 400 includes a digital block 401, first to third DACs 102 to 104, an OFDAC 105, an adder 106, a phase modulator 107, a DC / DC 108, a first and a second.

LDOs

109 and 110, a power amplifier 111, a temperature sensor 112, a temperature sensor 403, a multiplier 201, and an LUT 402 are provided. The digital block 401 includes a signal generation unit 1011, an offset control unit 4012, and a DC / DC output control unit 3013. In FIG. 7A, the same components as those in the third embodiment are denoted by the same reference numerals, and the description thereof is omitted.

7B, the adder 106 is disposed between the multiplier 201 and the second DAC 103, and adds an offset value to the amplitude signal A (t) in the digital domain. It may be. Although not shown, both the adder 106 and the multiplier 201 may be arranged in the analog region.

The polar modulation device 400 according to the fourth embodiment of the present invention further includes a temperature sensor 403 as compared with the third embodiment. The temperature sensor 403 measures the temperature of the first and

second LDOs

109 and 110 or the ambient temperature, and notifies the digital block 401 of the measured temperature information Tdet_LDO. It is assumed that there is almost no difference in temperature between the first LDO 109 and the second LDO 110.

In the digital block 401, the signal generation unit 1011 generates an amplitude signal and a phase signal. The offset control unit 4012 adjusts the amplitude signal using the multiplier 201 and the adder 106 when the characteristic of the amplitude level Vout2 of the modulation signal from the antenna 602 deviates from the standard characteristic at the specific temperature. Specifically, the offset control unit 4012 performs multiplication based on Tdet_LDO notified from the temperature sensor 403 in addition to temperature information Tdet notified from the temperature sensor 112 and temperature information Tdet_SD notified from the temperature sensor 603. The multiplication coefficient a set in the unit 201 and the offset value b set in the adder 106 are calculated.

The reference value of the temperature information is room temperature, and Tdet0 = + 25 degC, Tdet0_SD = + 25 degC, and Tdet0_LDO = + 25 degC. Also at this time, the relationship of the above (Equation 4) to (Equation 7) is established. Further, A (t) ′ is expressed by (Equation 19) in consideration of temperature changes of the power amplifier 111, the duplexer 600, the antenna SW601, and the

LDOs

109 and 110. However, the coefficients cG _PA , cG _SD , and cO _PA used in (Equation 19) are expressed by the above (Equation 9) to (Equation 11). The coefficients (correction values) cG _LDO and cO _LDO are expressed by (Equation 20) to (Equation 21). Here, C _GLDO is a gain compensation coefficient of the

LDOs

109 and 110 caused by temperature variations of the

LDOs

109 and 110. C _OLDO is a compensation coefficient for offset of the

LDOs

109 and 110 caused by temperature variations of the

LDOs

109 and 110.
A (t) ′ = cG _PA × cG _SD × cG _LDO × A (t) + cO _PA + cO _LDO
(Equation 19)
cG _LDO = 1 / eG _LDO
= C _GLDO x (Tdet_LDO-Tdet0_LDO) (Equation 20)
cO _LDO = -1 / h × eO _LDO
= 1 / h x C _OLDO x (Tdet_LDO-Tdet0_LDO) (Equation 21)

Next, when the multiplication coefficient a and the offset value b of (Equation 7) are calculated using (Equation 9) to (Equation 11) and (Equation 19) to (Equation 21), the multiplication coefficient a is ( Using equation (22), the offset value b can be expressed using equation (23).
a = cG _SD × cG _PA × cG _LDO (Expression 22)
b = cO _LDO + cO _PA (Expression 23)

The LUT 402 includes a gain compensation coefficient C _GPA for the power amplifier 111, a temperature compensation coefficient C _OPA for the offset of the power amplifier 111, a gain compensation coefficient C _GSD for the duplexer 600 and the antenna SW 601, and gain compensation for the

LDOs

109 and 110. and the coefficient _{C GLDO,} previously stores a compensation factor _{C OLDO} offset LDO109,110 (e.g., see FIG. 8A). Note that the compensation coefficients C _GPA , C _OPA , C _GSD , C _GLDO , and C _OLDO may change according to the temperature information (see, for example, FIG. 8B). This is because, as shown in FIG. 5, the rate of increase in loss generated in the duplexer 600, the antenna SW601, and the like changes according to the temperature. Referring to FIG. 8B, offset control unit 4012 uses compensation coefficients C _GPA1 and C _OPA1 when temperature information Tdet from temperature sensor 112 is below room temperature, and temperature information Tdet_SD from temperature sensor 603 is below room temperature. Sometimes the compensation coefficient C _GSD1 is used, and when the temperature information Tdet_LDO from the temperature sensor 403 is less than room temperature, the compensation coefficients C _GLDO1 and C _OLDDO1 are used. The temperature information Tdet will use the compensation factor _{_C GPA2,} _C _OPA2 at least room temperature from the temperature sensor 112, temperature information Tdet_SD from the temperature sensor 603 using a compensation coefficient _{C GSD2} at room temperature or higher temperatures When the temperature information Tdet_LDO from the sensor 403 is equal to or higher than room temperature, the compensation coefficients _CGLDO2 and _COLDO2 are used.

Here, in consideration of temperature changes of the power amplifier 111, the duplexer 600, the antenna SW601, and the

LDOs

109 and 110, the power supply voltage Vback is corrected by (Equation 24).
Vback = Gdcdc × Vpeak0 + Vdcdc + Vhr
(Equation 24)

Also, the DC / DC output control unit 4013 obtains the correction coefficient Gdcdc and the correction voltage Vdcdc, which are adjustment values from the standard characteristic, when the characteristic of the amplitude level Vout2 of the modulation signal from the antenna 602 is out of the standard characteristic. Calculate and output to the first DAC 102. Here, the correction coefficient Gdcdc and the correction voltage Vdcdc can be calculated from (Equation 25) and (Equation 26) as described in the third embodiment. Further, since the temperature variations of the

LDOs

109 and 110 are corrected by the adder 106 and the multiplier 201 using (Equation 22) and (Equation 23), the temperature signal of the

LDOs

109 and 110 causes an amplitude signal that is an LDO output. The peak voltage Vpeak does not change. For this reason, the headroom voltage Vhr, which is the difference between the power supply voltage Vback and the peak voltage Vpeak of the amplitude signal, does not change due to the temperature variation of the

LDOs

109 and 110, so that the correction coefficient Gdcdc and the correction voltage Vdcdc are corrected. There is no need to implement.
Gdcdc = cG _PA × cG _SD (Equation 25)
Vdcdc = cO _DCDC + cO _hr + h × cO _PA (Equation 26)

However, the offset value cO _DCDC of the DC / DC 108 is expressed by (Expression 27) using the DC / DC offset error eO _DCDC . The offset value cO _hr of the headroom voltage is expressed by (Equation 28) using the offset error eOhr of the headroom voltage.
cO _DCDC = −eO _DCDC (Equation 27)
cO _hr = −eOhr (Equation 28)

As described above, the polar modulation device 400 according to the fourth embodiment corrects the temperature characteristics of the

LDOs

109 and 110 in addition to the temperature characteristics of the power amplifying unit 111 and the temperature characteristics of the duplexer 600 and the antenna SW 601, and the antenna 602. The power fluctuation at the end can be prevented.

INDUSTRIAL APPLICABILITY The present invention is useful for a power control method and a power control device for a radio transmitter using a polar modulation device, and particularly for a device using a bipolar transistor that transmits and receives a high-frequency signal (for example, a mobile phone terminal). It can be used, and is suitable for the case where low distortion and high efficiency operation are desired.

100, 200, 300, 400, 900

Polar modulator

101, 301, 401, 901 Digital block 102-104, 902-904 DAC
105, 905 OFDAC
106,906 Adder 107,907 Phase modulator 108,908 DC / DC
109, 110, 909, 910 LDO
111, 911

Power amplifier

112, 403, 603, 912

Temperature sensor

1011, 9011

Signal generation unit

1012, 3012, 4012, 9012 Offset

control unit

1013, 3013, 4013 DC / DC output control unit 201

Multiplier

302, 402 LUT
600 Duplexer 601 Antenna SW
602 antenna

Claims

A polar modulation device,
A signal generator that generates an amplitude signal and a phase signal from the input signal;
An LDO linear regulator that outputs an amplitude signal voltage based on the amplitude signal;
A phase modulation unit for phase modulating the phase signal;
A power amplifier that generates a modulated signal by amplitude-modulating the phase-modulated phase signal, using the amplitude signal voltage supplied from the LDO linear regulator as a power supply voltage;
A temperature sensor that measures the temperature or ambient temperature of the power amplifier and outputs the temperature information; and
A DC / DC output control unit that outputs a control signal for controlling a power supply voltage for driving the LDO linear regulator according to the temperature information;
A polar modulation device comprising: a DC / DC converter that supplies a power supply voltage based on the control signal to the LDO linear regulator.
The polar modulator is
An offset control unit that calculates an offset value to be added to the amplitude signal according to the temperature information;
The polar modulation device according to claim 1, further comprising an adder that adds the offset value calculated by the offset control unit to the amplitude signal generated by the signal generation unit.
The offset control unit calculates an offset value to be added to the amplitude signal by multiplying an offset compensation coefficient caused by temperature variation of the power amplifier by a difference from a reference temperature of the temperature information. The polar modulation device according to claim 2, characterized in that it is characterized in that:
The polar modulator further includes an LUT that stores the temperature information and an offset value to be added to the amplitude signal in association with each other,
The polar modulation device according to claim 2, wherein the offset control unit calculates an offset value to be added to the amplitude signal from the LUT according to the temperature information.
The DC / DC output control unit calculates a correction voltage for correcting a power supply voltage for driving the LDO linear regulator according to the offset value, and a peak voltage of the amplitude signal when the temperature information is a reference temperature. In addition, the control signal is calculated by adding the correction voltage and the headroom voltage of the LDO linear regulator,
The polar modulation device according to claim 2, wherein the DC / DC converter supplies a power supply voltage based on the control signal to the LDO linear regulator.
6. The DC / DC output control unit according to claim 5, wherein an increase in the output voltage of the LDO linear regulator due to the addition of the offset value to the amplitude signal is used as the correction voltage. Polar modulation device.
The offset control unit calculates a multiplication coefficient for multiplying the amplitude signal based on the temperature information,
The polar modulation device further includes a multiplier that multiplies the multiplication signal by the amplitude signal generated by the signal generation unit,
The polar modulator according to claim 2, wherein the adder adds the offset value to the amplitude signal multiplied by the multiplication coefficient.
The offset control unit
The offset value is calculated by multiplying the offset compensation coefficient due to the temperature variation of the power amplifier by the difference from the reference temperature of the temperature information,
The polar coefficient according to claim 7, wherein the multiplication coefficient is calculated by multiplying a gain compensation coefficient caused by temperature variation of the power amplifier by a difference from a reference temperature of the temperature information. Modulation device.
The DC / DC output control unit calculates a correction voltage for correcting a power supply voltage for driving the LDO linear regulator according to the offset value, and a power supply voltage for driving the LDO linear regulator according to the multiplication coefficient. A correction coefficient for correcting the correction is calculated, the peak voltage of the amplitude signal when the temperature information is a reference temperature is multiplied by the correction coefficient, and the multiplication result is multiplied by the correction voltage and the headroom of the LDO linear regulator. The control signal is calculated by adding the voltage,
The polar modulation device according to claim 7, wherein the DC / DC converter supplies a power supply voltage based on the control signal to the LDO linear regulator.
The DC / DC output control unit sets an increase in the output voltage of the LDO linear regulator due to the addition of the offset value to the amplitude signal as the correction voltage, and sets the multiplication coefficient as the correction coefficient. The polar modulation device according to claim 9.
The polar modulation device according to claim 1, wherein the power amplifier is a heterojunction bipolar transistor (HBT / Heterojunction Bipolar Transistor) having a configuration in which different kinds of semiconductor layers are stacked vertically.
The DC / DC output control unit corrects a temperature variation of the DC / DC converter according to the temperature information and a correction for correcting a temperature variation of the headroom voltage of the LDO linear regulator. A power supply voltage of the LDO linear regulator when the temperature information is a reference temperature, and the calculated correction value of the DC / DC converter and a correction value of the headroom voltage of the LDO linear regulator, To calculate the control signal,
The polar modulation device according to claim 1, wherein the DC / DC converter supplies a power supply voltage based on the control signal to the LDO linear regulator.
The polar modulation device is connected to an antenna via a duplexer and an antenna SW, and measures a temperature or an ambient temperature of the duplexer and the antenna SW and outputs a second temperature information as a second temperature information. Connected to the temperature sensor,
The polar modulator is
An offset control unit that calculates a multiplication coefficient for multiplying the amplitude signal and an offset value to be added to the amplitude signal according to the temperature information and the second temperature information;
A multiplier for multiplying the amplitude signal generated by the signal generation unit by the multiplication coefficient;
The polar modulation device according to claim 1, further comprising an adder that adds the offset value to the amplitude signal output from the multiplier.
The polar modulation device includes a gain compensation coefficient caused by temperature variation of the power amplifier, an offset compensation coefficient caused by temperature variation of the power amplifier, and a gain caused by temperature variation of the duplexer and the antenna SW. An LUT that stores the compensation coefficient of
The offset control unit
From the LUT, a gain compensation coefficient caused by temperature variation of the power amplifier, an offset compensation coefficient caused by temperature variation of the power amplifier, and gain compensation caused by temperature variation of the duplexer and the antenna SW Read the coefficients and
The first correction value is calculated by multiplying the difference from the reference temperature of the temperature information by the gain compensation coefficient resulting from the temperature variation of the power amplifier read from the LUT,
By multiplying the difference of the second temperature information from the reference temperature by the gain compensation coefficient resulting from the temperature variation of the duplexer and the antenna SW read from the LUT, the second correction value is obtained. Calculate
A third correction value is calculated by multiplying the difference from the reference temperature of the temperature information by the offset coefficient compensation coefficient caused by the temperature variation of the power amplifier read from the LUT,
The polar modulation according to claim 13, wherein the multiplication coefficient is calculated using the first correction value and the second correction value, and the offset value is calculated using the third correction value. apparatus.
In the LUT, a plurality of gain compensation coefficients resulting from temperature variations of the power amplifier and offset compensation coefficients resulting from temperature variations of the power amplifier are set according to the temperature information, and the duplexer and A plurality of gain compensation coefficients resulting from temperature variations of the antenna SW are set according to the second temperature information,
The offset control unit reads, from the LUT, a gain compensation coefficient caused by temperature variation of the power amplifier and an offset compensation coefficient caused by temperature variation of the power amplifier according to the temperature information, The polar modulation device according to claim 14, wherein a gain compensation coefficient due to temperature variation of the duplexer and the antenna SW is read in accordance with second temperature information.
The DC / DC output control unit calculates a correction voltage for correcting a power supply voltage for driving the LDO linear regulator according to the offset value, and a power supply voltage for driving the LDO linear regulator according to the multiplication coefficient. A correction coefficient for correcting the correction is calculated, the peak voltage of the amplitude signal when the temperature information is a reference temperature is multiplied by the correction coefficient, and the multiplication result is multiplied by the correction voltage and the headroom of the LDO linear regulator. The control signal is calculated by adding the voltage,
The polar modulation device according to claim 13, wherein the DC / DC converter supplies a power supply voltage based on the control signal to the LDO linear regulator.
The DC / DC output control unit sets an increase in the output voltage of the LDO linear regulator due to the addition of the offset value to the amplitude signal as the correction voltage, and sets the multiplication coefficient as the correction coefficient. The polar modulation device according to claim 16, wherein:
The polar modulator is
A third temperature sensor that measures the temperature or ambient temperature of the LDO linear regulator and outputs it as third temperature information;
An offset control unit that calculates a multiplication coefficient for multiplying the amplitude signal and an offset value to be added to the amplitude signal according to the temperature information and the third temperature information;
A multiplier for multiplying the amplitude signal generated by the signal generation unit by the multiplication coefficient;
The polar modulation device according to claim 1, further comprising an adder that adds the offset value to the amplitude signal output from the multiplier.
The polar modulation device includes a gain compensation coefficient caused by temperature variation of the power amplifier, an offset compensation coefficient caused by temperature variation of the power amplifier, and a gain compensation coefficient caused by temperature variation of the LDO linear regulator. And an LUT that stores a compensation coefficient of offset caused by temperature variation of the LDO linear regulator,
The offset control unit
From the LUT, a gain compensation factor due to temperature variation of the power amplifier, an offset compensation factor due to temperature variation of the power amplifier, and a gain compensation factor due to temperature variation of the LDO linear regulator, Read offset compensation coefficient due to temperature variation of the LDO linear regulator,
The first correction value is calculated by multiplying the difference from the reference temperature of the temperature information by the gain compensation coefficient resulting from the temperature variation of the power amplifier read from the LUT,
A second correction value is calculated by multiplying the difference from the reference temperature of the temperature information by the compensation coefficient of the offset value caused by the temperature variation of the power amplifier read from the LUT,
A third correction value is calculated by multiplying the difference of the third temperature information from the reference temperature by the gain compensation coefficient resulting from the temperature variation of the LDO linear regulator read from the LUT,
A fourth correction value is calculated by multiplying the difference of the third temperature information from the reference temperature by the offset compensation coefficient caused by the temperature variation of the LDO linear regulator read from the LUT,
The multiplication coefficient is calculated using the first correction value and the third correction value, and the offset value is calculated using the second correction value and the fourth correction value. The polar modulation device according to claim 18.
In the LUT, a plurality of gain compensation coefficients caused by temperature variations of the power amplifier and offset compensation coefficients caused by temperature variations of the power amplifier are set according to the temperature information, and the LDO linear regulator A plurality of gain compensation coefficients resulting from temperature variations and offset compensation coefficients resulting from temperature variations of the LDO linear regulator are set according to the third temperature information,
The offset control unit reads, from the LUT, a gain compensation coefficient caused by temperature variation of the power amplifier and an offset compensation coefficient caused by temperature variation of the power amplifier according to the temperature information, The gain compensation coefficient caused by temperature variation of the LDO linear regulator and the offset compensation coefficient caused by temperature variation of the LDO linear regulator are read out according to third temperature information. The polar modulator according to claim 19.
The polar modulation device further includes a third temperature sensor that measures the temperature or ambient temperature of the LDO linear regulator and outputs the temperature as third temperature information,
The offset control unit calculates the offset value and the multiplication coefficient according to the temperature information, the second temperature information, and the third temperature information. 13. The polar modulation device according to 13.
The polar modulation device includes a gain compensation coefficient caused by temperature variation of the power amplifier, an offset compensation coefficient caused by temperature variation of the power amplifier, and a gain caused by temperature variation of the duplexer and the antenna SW. An LUT that stores a compensation coefficient of gain, a compensation coefficient of gain caused by temperature variation of the LDO linear regulator, and an offset compensation coefficient caused by temperature variation of the LDO linear regulator,
The offset control unit
From the LUT, a gain compensation coefficient caused by temperature variation of the power amplifier, an offset compensation coefficient caused by temperature variation of the power amplifier, and gain compensation caused by temperature variation of the duplexer and the antenna SW A coefficient, a gain compensation coefficient due to temperature variation of the LDO linear regulator, and an offset compensation coefficient due to temperature variation of the LDO linear regulator,
The first correction value is calculated by multiplying the difference from the reference temperature of the temperature information by the gain compensation coefficient resulting from the temperature variation of the power amplifier read from the LUT,
A second correction value is calculated by multiplying the difference from the reference temperature of the temperature information by the compensation coefficient of the offset value caused by the temperature variation of the power amplifier read from the LUT,
The third correction value is obtained by multiplying the difference from the reference temperature of the second temperature information by the gain compensation coefficient resulting from the temperature variation of the duplexer and the antenna SW read from the LUT. Calculate
A fourth correction value is calculated by multiplying the difference from the reference temperature of the third temperature information by the gain compensation coefficient resulting from the temperature variation of the LDO linear regulator read from the LUT,
A fifth correction value is calculated by multiplying the difference of the third temperature information from the reference temperature by the offset compensation coefficient caused by the temperature variation of the LDO linear regulator read from the LUT,
The multiplication coefficient is calculated using the first correction value, the third correction value, and the fourth correction value, and the second correction value and the fifth correction value are used. The polar modulation device according to claim 21, wherein the offset value is calculated.
In the LUT, a plurality of gain compensation coefficients resulting from temperature variations of the power amplifier and offset compensation coefficients resulting from temperature variations of the power amplifier are set according to the temperature information, and the duplexer and the A plurality of gain compensation coefficients caused by the temperature variation of the antenna SW are set in accordance with the second temperature information, and the gain compensation coefficient caused by the temperature variation of the LDO linear regulator and the temperature variation of the LDO linear regulator are set. A plurality of offset compensation coefficients are set according to the third temperature information,
The offset control unit reads, from the LUT, a gain compensation coefficient caused by temperature variation of the power amplifier and an offset compensation coefficient caused by temperature variation of the power amplifier according to the temperature information, According to the second temperature information, a gain compensation coefficient due to the temperature variation of the duplexer and the antenna SW is read, and according to the third temperature information, the gain due to the temperature variation of the LDO linear regulator 23. The polar modulation device according to claim 22, wherein a compensation coefficient for the offset and a compensation coefficient for an offset due to temperature variation of the LDO linear regulator are read out.
The DC / DC output controller is
According to the temperature information, a correction voltage for correcting a power supply voltage for driving the LDO linear regulator and a correction value for correcting a temperature variation of the DC / DC converter are calculated,
A correction coefficient for correcting a power supply voltage for driving the LDO linear regulator is calculated according to the temperature information and the second temperature information, and a headroom of the LDO linear regulator is calculated according to the second temperature information. Calculate the correction value to correct the temperature variation of the voltage,
The peak voltage of the amplitude signal when the temperature information is a reference temperature is multiplied by the correction coefficient, and the multiplication result is multiplied by the correction voltage, the headroom voltage of the LDO linear regulator, and the calculated DC / A control signal is calculated by adding the correction value of the DC converter and the correction value of the headroom voltage of the LDO linear regulator,
The polar modulation device according to claim 21, wherein the DC / DC converter supplies a power supply voltage based on the control signal to the LDO linear regulator.
The DC / DC output controller is
The LDO linear regulator is obtained by adding a first correction value obtained by multiplying the amplitude signal by a compensation coefficient of an offset caused by temperature variation of the power amplifier and a difference from the reference temperature of the temperature information. The increase in the output voltage is the correction voltage,
A gain resulting from temperature variation of the duplexer and the antenna SW, a second correction value obtained by multiplying a gain compensation coefficient due to temperature variation of the power amplifier, and a difference from the reference temperature of the temperature information. 25. The result obtained by multiplying the compensation coefficient by a third correction value obtained by multiplying the difference from the reference temperature of the second temperature information is defined as the correction coefficient. Polar modulation device.