JP2010154080A - Temperature compensation circuit and temperature compensation method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately execute temperature compensation of the gain of an analog signal processing unit over a wide temperature range with an extremely simple structure, in a wireless terminal device including an analog signal processing unit such as a transmission circuit. <P>SOLUTION: This temperature compensation circuit for executing temperature compensation of a wireless terminal device including an analog signal processing unit for input of a digital baseband modulation signal to be converted to an analog RF signal to be amplified and output includes: a temperature compensation control unit provided with a temperature sensor for measuring the temperature of the analog signal processing unit for determining an amplitude value of the baseband modulation signal for executing the temperature compensation of the analog signal processing unit in response to the temperature of the analog signal processing unit input from the temperature sensor; and an amplitude adjustment unit for adjusting the signal amplitude of the baseband modulation signal in response to the amplitude value determined by the temperature compensation control unit to be output to the analog signal processing unit. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a temperature compensation circuit and a temperature compensation method for performing gain temperature compensation in an analog signal processing unit of a wireless terminal device.

  The wireless terminal device performs frequency conversion of the RF signal received by the antenna into the baseband band, converts the frequency of the baseband signal into an RF signal and transmits the RF signal from the antenna, and a PHY unit that performs modulation / demodulation processing of the baseband signal And a control unit. The RF unit performs analog signal processing, and the PHY unit and control unit perform digital signal processing. In many cases, the operating temperature range of a wireless terminal for general use is defined to be approximately −40 ° C. to 85 ° C., and the wireless terminal is required to exhibit stable performance in this temperature range.

By the way, from the viewpoint of characteristic changes due to temperature fluctuations, the PHY unit that performs digital signal processing has almost no temperature fluctuations, but the RF unit that performs analog signal processing has large temperature fluctuations. Measures are taken. For example, in the method described in Non-Patent Document 1, a reference voltage generation circuit that does not depend on temperature is provided, and temperature fluctuations of element circuits constituting the RF section are suppressed, thereby suppressing characteristic fluctuation of the entire RF section.
Translated by Tadahiro Kuroda, Analog CMOS integrated circuit design, ISBN: 4-621-07221-8, Maruzen Co., Ltd., p.465

  With the technique of Non-Patent Document 1 described above, it is difficult to completely suppress temperature fluctuations in the RF unit that performs analog signal processing. Although this reference voltage generation circuit can suppress the temperature dependence of the power consumption of the circuit, it cannot compensate for a decrease in mobility of transistors constituting the circuit. This decrease in transistor mobility is related to the gain of the amplifier, and the influence is particularly great in the amplifier of the transmission circuit. For this reason, in an amplifier or the like of a transmission circuit, ingenuity such as realizing a reverse characteristic with a bias circuit is made in order to compensate for a gain variation due to a temperature variation.

  However, it has been difficult to achieve reverse characteristics over a wide temperature range. In addition, the bias circuit that realizes the reverse characteristic is an analog circuit and has some variation. Therefore, it is necessary to design in consideration of variations in the bias circuit that realizes the reverse characteristics, and there has been a problem that the cost increases due to the complexity of the configuration and the decrease in yield due to the expectation of the variation margin. The output stage of the analog signal processing unit is often composed of a plurality of amplifiers. However, if the above-described temperature compensation is performed on a plurality of amplifiers, the cost further increases.

  The present invention provides a wireless terminal device including an analog signal processing unit such as a transmission circuit, which has a very simple configuration and can accurately perform gain temperature compensation in the analog signal processing unit over a wide temperature range. An object is to provide a circuit and a temperature compensation method.

  According to a first aspect of the present invention, there is provided a temperature compensation circuit for performing temperature compensation of a wireless terminal device including an analog signal processing unit that inputs a digital baseband modulation signal, converts the analog baseband modulation signal into an analog RF signal, and amplifies and outputs the analog RF signal. A temperature sensor that measures the temperature of the signal processing unit, and determines the amplitude value of the baseband modulation signal for temperature compensation of the analog signal processing unit according to the temperature of the analog signal processing unit input from the temperature sensor A compensation control unit and an amplitude adjustment unit that adjusts the signal amplitude of the baseband modulation signal according to the amplitude value determined by the temperature compensation control unit and outputs the signal to the analog signal processing unit.

  In the temperature compensation circuit of the first invention, the amplitude adjusting unit includes a register that holds the amplitude value determined by the temperature compensation control unit, and a multiplier that multiplies the amplitude value held in the register by the baseband modulation signal. Composed.

  In the temperature compensation circuit of the first invention, the temperature compensation control unit holds a temperature characteristic necessary for temperature compensation of the analog signal processing unit as a table, and refers to the table to perform baseband modulation according to the temperature of the temperature sensor. In this configuration, the amplitude value of the signal is determined.

  In the temperature compensation circuit of the first invention, the wireless terminal device is configured to perform transmission processing and reception processing in a time-sharing manner, operates the temperature sensor for a predetermined time before performing the transmission processing, and operates the temperature compensation control unit intermittently. Means are provided.

  In the temperature compensation circuit of the first invention, the analog signal processing unit of the wireless terminal device includes TPC means for controlling the transmission power of the RF signal according to the reception power of the RF signal, and the temperature compensation control unit According to the received power and the temperature of the analog signal processing unit, the gain control value of the RF signal transmission power and the amplitude value of the baseband modulation signal are divided and determined and output to the TPC means and the amplitude adjusting unit, respectively. .

  This wireless terminal device is configured to perform transmission processing and reception processing in a time-sharing manner, operate the temperature sensor for a predetermined time before performing transmission processing, monitor the received power of the RF signal, and intermittently operate the temperature compensation control unit. Means for operating.

  According to a second aspect of the present invention, there is provided a temperature compensation method for performing temperature compensation of a wireless terminal device including an analog signal processing unit that inputs a digital baseband modulation signal, converts it to an analog RF signal, amplifies it, and outputs it. A first step of measuring the temperature of the analog signal processing unit using a sensor, and a baseband for performing temperature compensation of the analog signal processing unit according to the temperature of the analog signal processing unit measured in the first step A second step for determining the amplitude value of the modulation signal, and the amplitude value determined in the second step are set in the amplitude adjustment unit, and the signal amplitude of the baseband modulation signal is adjusted and output to the analog signal processing unit. 3 steps.

  In the temperature compensation method of the second invention, the second step refers to a table holding temperature characteristics necessary for temperature compensation of the analog signal processing unit, and the amplitude value of the baseband modulation signal according to the temperature of the temperature sensor. To decide.

  In the temperature compensation method of the second invention, the analog signal processing unit of the wireless terminal device includes TPC means for controlling the transmission power of the RF signal in accordance with the reception power of the RF signal, and the second step includes the step of The gain control value of the RF signal transmission power and the amplitude value of the baseband modulation signal are divided and determined according to the received power and the temperature of the analog signal processing unit, and output to the TPC means and the amplitude adjustment unit, respectively.

  The present invention adjusts the amplitude value of the digital baseband modulation signal input to the analog signal processing unit in accordance with the temperature of the analog signal processing unit of the wireless terminal device. Further, a temperature characteristic necessary for temperature compensation of the analog signal processing unit is held as a table, and the amplitude value of the baseband modulation signal corresponding to the temperature of the analog signal processing unit is determined with reference to this table, thereby simplifying With the configuration, the temperature compensation of the analog signal processing unit can be performed accurately and over a wide range.

  Further, by combining TPC and temperature compensation and dividing and determining the gain control value of the RF signal transmission power and the amplitude value of the baseband modulation signal, it is possible to perform TPC with temperature compensation with high accuracy.

(First embodiment)
FIG. 1 shows a first embodiment of a wireless terminal apparatus including a temperature compensation circuit of the present invention.
In FIG. 1, a wireless terminal device includes an RF unit 10 that performs analog signal processing such as frequency conversion between an RF signal and a baseband signal, a PHY unit 20 that performs digital signal processing such as modulation / demodulation processing of the baseband signal, and the wireless terminal device. It is comprised from the control part 30 which controls.

  In the present embodiment, since the RF unit 10 is a target of temperature compensation, the RF unit 10 includes a temperature sensor 11, and the output of the temperature sensor 11 is monitored by the temperature compensation control unit 31 of the control unit 30, and is necessary for temperature compensation. The amplitude value of the correct baseband signal is calculated. For example, the temperature compensation control unit 31 refers to a table storing temperature compensation parameters corresponding to the temperature characteristics of the amplifier of the transmission circuit 12 of the RF unit 10 and adjusts the amplitude value of the baseband modulation signal according to the temperature. The temperature compensation parameter is determined, and the temperature compensation parameter is output to the amplitude adjustment unit 21 of the PHY unit 20. The PHY unit 20 performs modulation processing of transmission data input from the control unit 30, and the amplitude adjustment unit 21 performs amplitude adjustment of the baseband modulation signal according to the temperature compensation parameter, and converts the temperature-compensated baseband modulation signal to RF. The data is output to the transmission circuit 12 of the unit 10.

  Although the RF unit 10 includes a temperature sensor 11 here, the temperature of the RF unit 10 can be measured if the temperature sensor 11 is very close to the RF unit 10, for example. The temperature sensor 11 may not be provided. The same applies to the second and third embodiments described later.

  Here, the temperature characteristics of the amplifier gain in the transmission circuit 12 of the RF unit 10 will be described. FIG. 2 shows an example of the temperature characteristic of the amplifier gain. The horizontal axis represents input power, and the vertical axis represents output power, which shows temperature characteristics at −20 ° C. to 80 ° C. at intervals of 20 ° C. FIG. 2 (2) is an enlarged view of a part of FIG. 2 (1).

  As shown in FIG. 2, the amplifier gain generally decreases as the temperature increases from a low temperature. Assuming that the target output power determined by the wireless specifications is 10 dBm, the input adjustment range of the amplifier to be controlled is about 1 dB depending on the temperature. Therefore, if the input signal power is adjusted according to the monitored temperature based on the temperature characteristic of the amplifier gain evaluated in advance, it is possible to obtain a constant transmission signal power without depending on the temperature.

  On the other hand, since the transmission circuit 12 of the RF unit 10 is composed of a plurality of element circuits having gain, the transmission / reception of the RF unit 10 can be performed by evaluating the input / output characteristics of the entire transmission circuit 12 in advance. The temperature compensation of the circuit 12 can be performed. The gain fluctuation of the transmission circuit 12 of the RF unit 10 due to temperature change is about several dB at most. The temperature compensation parameter managed by the control unit 30 is an amplitude ratio corresponding to the temperature with the signal amplitude at normal temperature being 1 (reference), and the temperature compensation parameter is set in the amplitude adjusting unit 21 of the PHY unit 20 to compensate the temperature. I do.

  FIG. 3 shows a configuration example of each unit of the first embodiment. Here, the power adjustment of ± 3 dB is performed with reference to the output power of the baseband signal at room temperature.

  In FIG. 3, the RF unit 10 includes a transmission circuit 12, a local oscillator (LO) 13, and a temperature sensor 11 that are targets of amplifier gain temperature compensation. The transmission circuit 12 includes a DA converter 121, a low-pass filter (LPF) 122, a mixer 123, a preamplifier 124, and a power amplifier 125. The DA converter 121 converts the digital baseband modulation signal input from the PHY unit 20 into an analog baseband modulation signal. The mixer 123 multiplies the analog baseband modulation signal input via the LPF 122 and the carrier signal output from the LO 13 and converts the product into an RF signal. This RF signal is amplified by preamplifier 124 and power amplifier 125 and transmitted from an antenna not shown.

  The PHY unit 20 includes an amplitude adjustment unit 21 and a modem circuit unit 22. The modem circuit unit 22 performs processing such as encoding for error correction, interleaving, and filtering for band limitation on transmission data input from the control unit 30. The amplitude adjustment unit 21 multiplies the adjustment value register 211 for setting the temperature compensation parameter input from the control unit 30 and the baseband modulation signal output from the modem circuit unit 22 and the value of the adjustment value register 211 to the RF unit 10. An output multiplier 212 is provided.

  The control unit 30 includes an MPU (Micro-Processing Unit) and a memory that stores a program, but the temperature compensation control unit 31 is also set in the MPU and the memory. The temperature compensation control unit 31 is configured to output a temperature compensation parameter corresponding to the temperature information of the temperature sensor 11 with reference to the temperature compensation parameter table 32 that stores the temperature compensation parameter.

FIG. 4 shows an operation flow of the temperature compensation control unit 31 of the first embodiment.
In FIG. 4, the temperature compensation control unit 31 of the control unit 30 starts the temperature compensation control before the transmission data is output to the modem circuit unit 22 of the PHY unit 20. The temperature compensation control unit 31 reads the output of the temperature sensor 11 of the RF unit 10 (S1). Next, the temperature compensation control unit 31 refers to the temperature compensation parameter table 32, determines a temperature compensation parameter corresponding to the output of the temperature sensor 11 (S2), and then uses this temperature compensation parameter as an amplitude adjustment unit of the PHY unit 20. 21 is set in the adjustment value register 211 (S3).

  The amplitude adjustment unit 21 of the PHY unit 20 multiplies the baseband modulation signal output from the modem circuit unit 22 by the multiplier 212 and the value of the adjustment value register 211, adjusts the signal amplitude of the baseband modulation signal, and outputs the RF unit. 10 is output. As a result, the RF unit 10 can compensate for gain fluctuation due to temperature fluctuation of the RF unit 10 by adjusting the signal amplitude of the baseband modulation signal input from the PHY unit 20.

  FIG. 5 shows an example of the temperature compensation parameter table 32. The temperature compensation parameter table 32 is set in advance by evaluating the overall temperature characteristics of the transmission circuit 12 of the RF unit 10.

  In the example shown in FIG. 5, since the gain of the transmission circuit 12 decreases by 1 dB when the temperature of the RF unit 10 is 20 ° C. and becomes 40 ° C., the output of the transmission circuit 12 is increased by 1 dB. This shows that temperature compensation is performed by increasing the signal amplitude of the baseband modulation signal input to the transmission circuit 12. In FIG. 5, the dB display in which the amplitude ratio is converted into electric power and the output value of the amplitude adjustment unit are shown for explanation, but only the amplitude ratio corresponding to the temperature may be stored as the temperature compensation parameter. For example, the amplitude ratio is “1” when the temperature of the RF unit 10 is 20 ° C. In this case, the output of the modem circuit unit 22 is output from the amplitude adjustment unit 21 to the transmission circuit 12 of the RF unit 10 as it is. Since the gain characteristic of the RF unit 10 is based on a state of 20 ° C., the output level of the RF unit 10 is a predetermined level. Next, when the temperature of the RF unit 10 reaches 40 ° C., the gain fluctuation of the RF unit 10 becomes −1 dB, and the amplitude ratio is set to “1.122”. The amplitude ratio of this baseband modulation signal is equivalent to increasing 1 dB when converted to a power ratio, and the gain variation of -1 dB in the RF unit 10 is canceled to obtain a total gain characteristic of 0 dB. A predetermined signal output is obtained.

  When the temperature of the RF unit 10 is between 20 ° C. and 40 ° C., for example, the measurement temperature is cut down and set to 20 ° C. Usually, the upper limit of the transmission power in the wireless terminal device is determined by the specifications of the wireless system, and it is preferable that the transmission power exceeding the specified value is not output, so it is reasonable to operate with the measured temperature cut down. Although the scale of the temperature compensation parameter table 32 becomes large, the temperature compensation parameter table 32 may be subdivided to finely compensate the temperature. Further, the amplitude ratio corresponding to the temperature may be determined by linear interpolation without subdividing the table. Since the degree of temperature compensation depends on the transmission power range defined by the wireless system, the resolution of the temperature compensation parameter table 32 may be set according to each specification.

  By setting such a temperature compensation parameter, temperature compensation from -40 ° C. to 80 ° C. (± 3 dB as a gain compensation range) can be performed. In the table of FIG. 5, the signal amplitude for each amplitude ratio is shown in 8-bit display for reference. That is, if the dynamic range of the signal amplitude of the band limiting filter output of the modem circuit unit 22 is scaled to be ± 89, the full range ± 127 of the 8-bit DA converter is obtained by multiplying the amplitude ratio according to temperature. The signal amplitude after temperature compensation can be set to fall within.

  As described above, in the present embodiment, the configuration is such that the logical amplitude of the baseband modulation signal that is a digital signal is adjusted in order to compensate for the gain fluctuation of the RF unit 10. For this reason, there is no variation compared to the case of amplitude adjustment by an analog circuit, and there is a feature that there is no temperature fluctuation of the amplitude adjustment unit itself. Therefore, temperature compensation can be performed with high accuracy.

  Further, in the normal temperature compensation, the temperature compensation is performed for each amplifier of the transmission circuit that performs analog signal processing. In this case, since the degree of temperature compensation of the individual amplifiers of the transmission circuit varies, it is difficult to accurately realize temperature compensation for the entire transmission circuit. In this embodiment, if the temperature compensation parameters of the entire transmission circuit are held as a table, it can be handled by the amplitude control of the digital signal, so that the temperature compensation of the entire transmission circuit can be realized with extremely high accuracy.

(Second Embodiment)
FIG. 6 shows a second embodiment of a wireless terminal apparatus including the temperature compensation circuit of the present invention.
In FIG. 6, the wireless terminal device includes an RF unit 10, a PHY unit 20, and a control unit 30. The RF unit 10 includes a temperature sensor 11, a transmission circuit 12, a local oscillator 13, and a reception circuit 14. The PHY unit 20 includes an amplitude adjustment unit 21, and the control unit 30 includes a temperature compensation control unit 31 and an enable control unit 33.

  Here, it is assumed that reception processing and transmission processing are performed in a time division manner by the TDMA method, and the enable control unit 33 of the control unit 30 outputs a timing control signal corresponding to the time division control. The temperature sensor 11 is controlled by a TEMP control signal, the transmission circuit 12 is controlled by a TX control signal, the local oscillator 13 is controlled by an LO control signal, and the reception circuit 14 is controlled by an RX control signal.

FIG. 7 shows the operation timing of the second embodiment.
6 and 7, the local oscillator 13 of the RF unit 10 operates when the LO control signal is low. At the timing when the LO control signal becomes low, the RX control signal and the TX control signal alternately become low, and the reception circuit 14 and the transmission circuit 12 operate. A predetermined guard time is set between reception and transmission. The TEMP control signal becomes low at the timing when the LO control signal and the RX signal become low so that the transmission timing after reception is in time, and the temperature sensor 11 operates. The temperature compensation control unit 31 inputs temperature information from the temperature sensor 11 at a timing when the TEMP control signal becomes low, determines a temperature compensation parameter according to the temperature, and at a timing immediately before the TX control signal becomes low, PHY. The adjustment value register 211 of the amplitude adjustment unit 21 of the unit 20 is accessed to set the temperature compensation parameter.

FIG. 8 shows an operation flow of the temperature compensation control unit 31 of the second embodiment.
6 and 8, the temperature compensation control unit 31 of the control unit 30 starts the temperature compensation control before outputting transmission data to the PHY unit 20. First, the temperature compensation control unit 31 operates the temperature sensor 11 to set the TEMP control signal for starting the temperature compensation control to low (S11), and the temperature compensation control unit 31 reads the output of the temperature sensor 11 of the RF unit 10 (S1). ). The subsequent steps are the same as those in the first embodiment shown in FIG. As a result, the temperature sensor 11 and the temperature compensation control unit 31 do not need to be constantly operated, and the power consumed by the temperature compensation control can be reduced.

  In the operation timing shown in FIG. 7, the temperature compensation control is started by setting the TEMP control signal to low and operating the temperature sensor 11 before the timing of operating the receiving circuit 14. If the operation is completed, the temperature compensation control may be started by setting the TEMP control signal to low and operating the temperature sensor 11 before the timing of operating the transmission circuit 12.

(Third embodiment)
FIG. 9 shows a third embodiment of a wireless terminal apparatus including the temperature compensation circuit of the present invention.
This embodiment is characterized by performing transmission power control (TPC) together with temperature compensation control. The transmission power control (TPC) is a function for controlling the transmission signal power of the wireless terminal apparatus according to the distance from the base station obtained from the reception level.

  Here, a description will be given based on a configuration example of each part of the first embodiment shown in FIG. The RF unit 10 includes a TPC control register 15 that performs gain control of the preamplifier 124 and the power amplifier 125 of the transmission circuit 12 and is associated with the present embodiment, and includes an RSSI (Received Signal Strength Indicator) circuit 141 of the reception circuit 14. This is a configuration for detecting the reception level. The control unit 30 includes a temperature compensation / TPC control unit 34 instead of the temperature compensation control unit 31, and the temperature compensation / TPC control unit 34 refers to the temperature compensation parameter table 32 and the TPC parameter table 35. The temperature compensation / TPC control unit 34 is configured to perform TPC together with the temperature compensation control similar to that of the first embodiment. However, the temperature compensation parameter and the TPC parameter are adjusted to each other in consideration of the difference between both gain adjustment ranges. The parameter is set.

FIG. 10 shows an operation flow of the temperature compensation / TPC control unit 34 of the third embodiment.
In FIG. 10, the temperature compensation / TPC control unit 34 of the control unit 30 starts TPC together with temperature compensation control before outputting transmission data to the modem circuit unit 22 of the PHY unit 20. The temperature compensation / TPC control unit 34 reads the output of the temperature sensor 11 of the RF unit 10 (S1), and determines the temperature compensation parameter corresponding to the output of the temperature sensor 11 with reference to the temperature compensation parameter table 32 (S2). . On the other hand, the temperature compensation / TPC control unit 34 reads the reception level from the reception circuit 14 of the RF unit 10 (S21), and refers to the TPC parameter table 35 to determine the TPC parameter according to the reception level (S22). The TPC parameter is determined in advance as a specification according to the radio system as a gain control value corresponding to the transmission signal power corresponding to the reception level. Next, the temperature compensation / TPC control unit 34 sets parameters (gain control values) set in the preamplifier 124 and the power amplifier 125 of the transmission circuit 12 and the amplitude adjustment unit 21 of the PHY unit 20 based on the temperature compensation parameter and the TPC parameter, respectively. Is determined and output (S23).

  The processing in step S23 will be specifically described. Here, the amplitude adjustment unit 21 of the PHY unit 20 can perform gain adjustment in units of 1 dB with respect to the gain fluctuation of the RF unit 10, but the preamplifier 124 and the power amplifier 125 of the RF unit 10 are analog circuits. It is difficult to adjust the gain in 1 dB units. Therefore, the following description will be made assuming that the gain adjustment range of the preamplifier 124 is two steps of −5 dB and −10 dB, and the gain adjustment range of the power amplifier 125 is two steps of −20 dB and −40 dB.

  The TPC parameter corresponding to the reception level is set to −23 dB, and the temperature obtained from the temperature sensor 11 is set to 40 ° C. When the temperature is 40 ° C., the gain fluctuation of the RF unit 10 is −1 dB from the temperature compensation parameter table 32 shown in FIG. Therefore, the gain adjustment by both the adjustment value register 211 and the TPC control register 15 of the amplitude adjustment unit 21 may be -22 dB obtained by subtracting -1 dB from -23 dB of the TPC parameter. The temperature compensation / TPC control unit 34 has −20 dB for the power amplifier 125 and 0 dB for the preamplifier 124 according to the gain adjustment ranges of the amplitude adjustment unit 21 of the PHY unit 20, the preamplifier 124 of the RF unit 10, and the power amplifier 125. The adjustment unit 21 sets the combination to be −2 dB.

  As described above, in the temperature compensation / TPC of this embodiment, the parameters to be set in the adjustment value register 211 and the TPC control register 15 of the amplitude adjustment unit 21 are mutually adjusted based on the temperature compensation parameter and the TPC parameter, and the adjustment value register By performing a part of the TPC of the RF unit 10 at 211, temperature compensation and TPC can be performed with high accuracy.

  Note that the gain switching in the analog circuit unit is realized, for example, by switching a resistance ratio or a current ratio. This is due to the characteristics of the integrated circuit that can realize the relative accuracy relatively accurately although the absolute accuracy of the circuit elements is low. For example, when the reference resistor is switched from 1:10 to 1: 5, the amplitude gain is halved (power ratio -6 dB), and when the reference resistor is switched from 1:10 to 1: 1, the amplitude gain is 1/10 (power ratio). -20dB). On the other hand, such a large gain switching is difficult in a digital circuit. This is because the resolution (dynamic range) has to be increased for switching, the scale of the digital circuit is increased, and the DA converter must also have a high resolution. For this reason, in the present embodiment, the gain switching of the analog circuit suitable for coarse adjustment and the gain switching of the digital circuit suitable for fine adjustment are combined to realize highly accurate TPC and temperature compensation control as a whole with a simple circuit configuration. .

  Further, as in the second embodiment, the present embodiment can also be applied to a configuration in which reception processing and transmission processing are performed in a time division manner by the TDMA method.

The figure which shows 1st Embodiment of the radio | wireless terminal apparatus containing the temperature compensation circuit of this invention. The figure which shows an example of the temperature characteristic of amplifier gain. The figure which shows the structural example of each part of 1st Embodiment. The flowchart which shows the operation | movement flow of the temperature compensation control part 31 of 1st Embodiment. The figure which shows an example of a temperature compensation parameter table. The figure which shows 2nd Embodiment of the radio | wireless terminal apparatus containing the temperature compensation circuit of this invention. The time chart which shows the operation timing of 2nd Embodiment. The flowchart which shows the operation | movement flow of the temperature compensation control part 31 of 2nd Embodiment. The figure which shows 3rd Embodiment of the radio | wireless terminal apparatus containing the temperature compensation circuit of this invention. 10 is a flowchart showing an operation flow of a temperature compensation / TPC control unit according to a third embodiment.

Explanation of symbols

10 RF unit 11 Temperature sensor 12 Transmission circuit 121 DA converter (D / A)
122 Low-pass filter (LPF)
123 mixer 124 preamplifier 125 power amplifier 13 local oscillator (LO)
DESCRIPTION OF SYMBOLS 14 Reception circuit 15 TPC control register 20 PHY part 21 Amplitude adjustment part 211 Adjustment value register 212 Mixer 22 Modem circuit part 30 Control part 31 Temperature compensation control part 32 Temperature compensation parameter table 33 Enable control part 34 Temperature compensation and TPC control part 35 TPC Parameter table

Claims (9)

In a temperature compensation circuit that performs temperature compensation of a wireless terminal device including an analog signal processing unit that inputs a digital baseband modulation signal, converts it to an analog RF signal, amplifies it, and outputs it,
A temperature sensor for measuring the temperature of the analog signal processing unit;
A temperature compensation control unit that determines an amplitude value of the baseband modulation signal for performing temperature compensation of the analog signal processing unit according to the temperature of the analog signal processing unit input from the temperature sensor;
A temperature compensation circuit comprising: an amplitude adjustment unit that adjusts a signal amplitude of the baseband modulation signal according to an amplitude value determined by the temperature compensation control unit and outputs the signal to the analog signal processing unit . The temperature compensation circuit according to claim 1,
The amplitude adjustment unit includes a register that holds the amplitude value determined by the temperature compensation control unit, and a multiplier that multiplies the amplitude value held in the register by the baseband modulation signal. Temperature compensation circuit. The temperature compensation circuit according to claim 1,
The temperature compensation control unit holds a temperature characteristic necessary for temperature compensation of the analog signal processing unit as a table, and determines an amplitude value of the baseband modulation signal according to the temperature of the temperature sensor with reference to the table A temperature compensation circuit characterized by having a configuration as described above. The temperature compensation circuit according to claim 1,
The wireless terminal device is configured to perform transmission processing and reception processing in a time-sharing manner, and includes means for operating the temperature sensor for a predetermined time before performing transmission processing and intermittently operating the temperature compensation control unit. A characteristic temperature compensation circuit. The temperature compensation circuit according to claim 1,
The analog signal processing unit of the wireless terminal device includes TPC means for controlling the transmission power of the RF signal according to the reception power of the RF signal,
The temperature compensation control unit divides and determines the gain control value of the RF signal transmission power and the amplitude value of the baseband modulation signal according to the received power of the RF signal and the temperature of the analog signal processing unit. The temperature compensation circuit is configured to output to each of the TPC means and the amplitude adjustment unit. The temperature compensation circuit according to claim 5,
The wireless terminal device is configured to perform transmission processing and reception processing in a time-sharing manner, operate the temperature sensor for a predetermined time before performing transmission processing, monitor the received power of the RF signal, and perform the temperature compensation control. A temperature compensation circuit comprising means for intermittently operating the part. In a temperature compensation method for performing temperature compensation of a wireless terminal device including an analog signal processing unit that inputs a digital baseband modulation signal, converts it to an analog RF signal, amplifies it, and outputs it,
A first step of measuring the temperature of the analog signal processing unit using a temperature sensor;
A second step of determining an amplitude value of the baseband modulation signal for performing temperature compensation of the analog signal processing unit according to the temperature of the analog signal processing unit measured in the first step;
And a third step of setting the amplitude value determined in the second step in an amplitude adjusting unit, adjusting the signal amplitude of the baseband modulation signal, and outputting the adjusted signal to the analog signal processing unit. Temperature compensation method. The temperature compensation method according to claim 7, wherein
The second step refers to a table holding temperature characteristics necessary for temperature compensation of the analog signal processing unit, and determines an amplitude value of the baseband modulation signal according to the temperature of the temperature sensor. Temperature compensation method. The temperature compensation method according to claim 7, wherein
The analog signal processing unit of the wireless terminal device includes TPC means for controlling the transmission power of the RF signal according to the reception power of the RF signal,
In the second step, the gain control value of the transmission power of the RF signal and the amplitude value of the baseband modulation signal are divided and determined according to the reception power of the RF signal and the temperature of the analog signal processing unit. And outputting to the TPC means and the amplitude adjusting unit, respectively.

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