WO2012124576A1 - 利得制御回路、通信装置、電子機器、及び、利得制御方法 - Google Patents
利得制御回路、通信装置、電子機器、及び、利得制御方法 Download PDFInfo
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
- H03G3/3042—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers in modulators, frequency-changers, transmitters or power amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
- H03G3/3068—Circuits generating control signals for both R.F. and I.F. stages
Definitions
- the technology disclosed in this specification relates to a gain control circuit, a communication device, an electronic device, and a gain control method.
- intermodulation distortion in which this interference wave component is also demodulated.
- the linear performance of the amplifier circuit or the frequency mixing circuit is low, it is only necessary to consider the reception band (usually only the primary component of the modulation signal). ) Causes third-order distortion, which significantly deteriorates the reception quality.
- band-pass filter As a technique for preventing the problem of “intermodulation distortion”, for example, a technique of adding a band-pass filter having wavelength selectivity to the input unit of the receiving circuit is known.
- this method causes an increase in cost for the band-pass filter and an increase in the substrate area.
- the band-pass filter since the band-pass filter generally operates only on a fixed frequency, it is difficult to use the corresponding frequency in a variable manner, and it is difficult to use the communication channel (in other words, the carrier frequency: hereinafter referred to as “band”). It is necessary to prepare for each.
- the input stage is a gain control circuit (variable gain amplifier circuit) so that the intermodulation distortion can be suppressed in use, and the gain is increased at the time of large input.
- Japanese Patent Application Laid-Open No. 2000-244353 proposes a technique for suppressing distortion in the gain control circuit and the subsequent frequency conversion circuit (mixing circuit, mixer).
- This disclosure is intended to provide a technique capable of suppressing intermodulation distortion.
- a gain control circuit determines a first amplifier that amplifies an input signal, an input signal that is input to the first amplifier, and controls an amplification factor of the first amplifier based on the determination result A signal determination unit.
- Each gain control circuit described in the dependent claims of the gain control circuit according to the first aspect of the present disclosure defines a further advantageous specific example of the gain control circuit according to the first aspect of the present disclosure.
- a communication apparatus includes a first amplifier that amplifies a reception signal, a reception unit that performs reception processing based on a signal output from the first amplifier, and a reception that is input to the first amplifier.
- a signal determination unit that determines a signal and controls an amplification factor of the first amplifier based on the determination result.
- the communication apparatus is similarly applicable to each technology and technique described in the dependent claims of the gain control circuit according to the first aspect. Further advantageous specific examples of the communication device according to the second aspect are defined.
- An electronic apparatus is input to a first amplifier that amplifies an input signal, a signal processing unit that performs signal processing based on a signal output from the first amplifier, and the first amplifier A signal determination unit that determines an input signal and controls an amplification factor of the first amplifier based on the determination result;
- the respective technologies and techniques described in the dependent claims of the gain control circuit according to the first aspect can be similarly applied. Further advantageous specific examples of the electronic device according to the third aspect are defined.
- An electronic device includes a first amplifier that amplifies a reception signal, a reception unit that performs reception processing based on a signal output from the first amplifier, and a reception that is input to the first amplifier.
- a signal determination unit that determines a signal and controls an amplification factor of the first amplifier based on the determination result.
- the input signal includes a desired wave and an interference wave
- the amplification factor of the first amplifier is controlled with a constant level difference between the desired wave and the interference wave.
- the techniques and methods described in the dependent claims of the gain control circuit according to the first aspect can be similarly applied.
- a further advantageous specific example of the gain control method according to the fifth aspect will be defined.
- the technique of the present disclosure controls the amplification factor of the first amplifier in a feedforward system. Unlike the technique proposed in Japanese Patent Laid-Open No. 2000-244353, it is not necessary to provide two stages of gain control circuits in the input signal system.
- the gain of the first amplifier is controlled by feedforward, which is different from the technique proposed in Japanese Patent Laid-Open No. 2000-244353.
- a gain control technique can be realized.
- FIG. 1 is a diagram for explaining cross modulation distortion.
- FIG. 2 is a diagram illustrating the basic configuration of the gain control circuit of the present embodiment.
- FIG. 3 is a diagram illustrating a first modified configuration of the gain control circuit of the present embodiment.
- FIG. 4 is a diagram illustrating a second modified configuration of the gain control circuit of the present embodiment.
- FIG. 5 is a diagram illustrating the communication apparatus (having a reception circuit) according to the first embodiment.
- FIG. 6 is a diagram illustrating a configuration example of the input amplification unit (gain control circuit).
- FIG. 7 is a diagram showing the relationship between the input level of the communication apparatus and the SN ratio (SNR).
- SNR SN ratio
- FIG. 8 is a diagram showing the relationship between the attenuation of the input amplification unit, the SN ratio, and IIP3 when the desired wave is ⁇ 30 dBm.
- FIG. 9 is a diagram showing the relationship between the attenuation of the input amplifier, the SN ratio, and IIP3 when the desired wave is ⁇ 14 dBm.
- FIG. 10 is a diagram illustrating the communication apparatus (having a reception circuit) according to the second embodiment.
- FIG. 11 is a diagram for explaining the operation of the communication apparatus according to the second embodiment.
- FIG. 12A to FIG. 12C are diagrams for explaining the third embodiment.
- the gain control circuit, the communication device, and the electronic device determine a first amplifier that amplifies an input signal (for example, a received signal) and an input signal that is input to the first amplifier, and based on the determination result And a signal determination unit for controlling the amplification factor of the first amplifier.
- the gain control system for the first amplifier is realized by feedforward. Therefore, basically, it is not necessary to provide two stages of gain control circuits in the input signal system. Furthermore, the circuit is simplified as a whole.
- a plurality of communication units including a first amplifier, a reception unit, and a signal determination unit may be provided.
- the signal determination unit determines each level of the desired wave and the interference wave.
- the signal determination unit may perform determination without distinguishing the level of the desired wave and the level of the interference wave. If the desired wave level is higher, control is performed using the absolute value of the desired wave level, and if the desired wave level is higher, control is performed using the absolute value of the disturbing wave level.
- the signal determination unit includes a second amplifier that amplifies the input signal input to the first amplifier, and a level detection unit that detects the level of the output signal of the second amplifier. It is good.
- the level detection unit controls the first amplifier with a relative relationship between the amplification factor of the first amplifier and the amplification factor of the second amplifier.
- the gain of the first amplifier and the gain of the second amplifier are controlled to be the same. Additional circuits such as offset adjustment are not required.
- the second amplifier is preferably smaller in proportion to the size of the first amplifier.
- the first amplifier is preferably good in noise characteristic, but the second amplifier is not necessary, and it is only necessary to distinguish between the level of the desired wave and the level of the interference wave.
- the signal determination unit includes a first level detection unit that detects the level of the desired wave, a second level detection unit that detects the level of the interference wave, a first level detection unit, and a second detection unit. It is preferable to have a level determination unit that controls the amplification factor of the first amplifier based on the detection result. That is, the configuration is such that the desired wave level and the interference wave level are distinguished and determined.
- any of the first method and the second method it is preferable to control the amplification factor of the first amplifier with a constant level difference between the desired wave and the interference wave.
- the gain control circuit, the communication device, and the electronic device may be provided with a band limiting unit that limits the band of the output signal to the band of the desired wave at the output of the first amplifier. This is because the gain control system for the first amplifier is realized by feedforward, so that it is not affected by the band limitation on the output of the first amplifier.
- the gain control circuit, the communication device, and the electronic device detect the signal level corresponding to the output signal level of the first amplifier after the first amplifier to obtain the amplification factor of the first amplifier.
- a feedback control loop for controlling may be provided. This is because it is better to have a gain control loop when the input signal is small.
- This control loop is preferably configured with negative feedback, but is not necessarily limited to negative feedback.
- FIG. 1 is a diagram for explaining cross modulation distortion.
- harmonic distortion occurs depending on its characteristics and nonlinearity. Measuring harmonic distortion while changing the frequency of the sine wave is not enough to evaluate the true performance of the amplifier circuit used in applications where signals with different frequencies are input (for example, communication applications). . In many communications applications, it is necessary to evaluate amplifier circuits using the amount of intermodulation distortion at two or more specified frequencies in order to use multiple channels multiplexed in the frequency domain. Become.
- FIG. 1 shows this state, focusing on the second-order and third-order intermodulation products generated when two signals having frequencies f1 and f2 are applied to the nonlinear element.
- the second order intermodulation distortion is defined using the value of IP2
- the third order intermodulation distortion is defined using the value of IP3.
- the numbers read on the input level side are represented by IIP
- the numbers read on the output level side are represented by OIP
- the order (multiplier) is added to them to represent IIP2, IIP3, OIP2, OIP3, and the like.
- FIG. 2 is a diagram illustrating the basic configuration of the gain control circuit of the present embodiment.
- the gain control circuit 10A is incorporated in the signal processing circuit 1, and includes a variable amplification unit 12, a signal processing unit 14 having a level detection function, and a signal determination unit 20.
- the variable amplification unit 12 is provided in the main signal path, and the output signal is input to the signal processing unit 14, and the signal processing unit 14 performs predetermined signal processing. For this reason, as the variable amplifying unit 12, a low noise amplifier having good noise characteristics (generally having a large size) is used. For example, when the signal processing unit 14 performs reception processing, a demodulation circuit is provided. In performing the required signal processing, the signal processing unit 14 detects an input level (an output level of the variable amplification unit 12) or a signal level of a predetermined functional unit in the signal processing unit 14 corresponding to the input level, The detection result is supplied to the variable amplifier 12.
- an automatic gain adjustment (AGC: Automatic Gain Control) function is performed by a feedback loop (NFB).
- AGC Automatic Gain Control
- the gain adjustment function for the main signal path that makes the input level of the signal processing unit 14 constant when the input level of the variable amplifying unit 12 is small is not limited to that constituted by a feedback loop, Any circuit configuration may be adopted.
- the signal determination unit 20 is provided in a signal path (referred to as a replica signal path) different from the main signal path, determines the state of the signal input to the variable amplification unit 12, and determines the input level of the variable amplification unit 12.
- a replica signal path determines the state of the signal input to the variable amplification unit 12, and determines the input level of the variable amplification unit 12.
- an automatic gain adjustment function is operated by feedforward (FF) with the variable amplification unit 12 so that the input level of the signal processing unit 14 becomes constant.
- the start point (AGC_start) of the feed-forward AGC by the signal determination unit 20 and the variable amplification unit 12 is assumed to be ⁇ dBm.
- the threshold value (Threshold) of the signal determination unit 20 is set to ⁇ dBm.
- the gain of the variable amplifying unit 12 is reduced according to the determination output of the signal determining unit 20.
- the gain of the variable amplifying unit 12 is maximized to prevent NF (noise figure) degradation, and conversely, the gain is limited in the case of a large input, thereby causing distortion in the variable amplifying unit 12 and the signal processing unit 14.
- the signal transmission device 1 (for example, a receiving circuit) having a wide dynamic range is configured.
- the amplification function of the variable amplification unit 12 works so that the input level of the signal processing unit 14 does not decrease.
- the determination result of the signal determination unit 20 is received, and the input level of the signal processing unit 14 is prevented from being excessively increased by the attenuation (attenuation) function of the variable amplification unit 12. Distortion in the variable amplification unit 12 and the signal processing unit 14 can be suppressed. For example, if the input level is larger than the AGC start point and larger than the threshold value of the signal determination unit 20, the function is activated.
- the gain control circuit is One is enough. Further, since the control by the signal determination unit 20 is not feedback control, the interference signal can be detected in a wide band without being affected by the band limitation of the circuit on the rear stage side of the variable amplification unit 12.
- the signal determination unit 20 determines the state of each signal level of the desired signal and the interference signal, it is important that the signal determination unit 20 has a wider bandwidth than the variable amplification unit 12. In other words, it is required to support not only the desired signal component but also the frequency band of the interference signal component.
- the variable amplifying unit 12 is sufficient if it corresponds to the frequency band of the desired signal component, and it is preferable that the frequency characteristics of the interference signal component have been reduced.
- FIG. 3 is a diagram illustrating a first modified configuration of the gain control circuit of the present embodiment.
- the gain control circuit 10B of the first modified configuration is different from the gain control circuit 10A of the basic configuration in that the variable determination unit 22 and the level detection unit 24 are provided in the signal determination unit 20.
- the other points are the same as the gain control circuit 10A.
- the signal determination unit 20 of the modified configuration 1 is configured such that when a plurality of types of signals having different frequencies are supplied to the variable amplification unit 12, each signal level of a signal having a desired frequency (desired signal) and other signals (interfering signals).
- the variable amplifying unit 12 is controlled to operate in an appropriate state on the basis of the state. “To make the variable amplification unit 12 operate in an appropriate state” means that the variable amplification unit 12 operates in a state where IIP3 is at a required level regardless of the state of the desired signal level and the interference signal level. Means.
- the relationship between the desired signal level, interference signal level, and IIP3 is as shown in FIG. That is, in logarithmic notation, the function for the desired signal is represented as a curve with a slope of 1, and the third-order intermodulation distortion is represented by a curve of slope 3, in other words, increases in proportion to the cube of the product of the two signals. To do.
- the variable amplifying unit 12 is operated in a state in which IIP3 is at a required level. Specifically, the gain control operation of the variable amplifying unit 12 is performed in a state where the ratio (D / U) of the desired signal level (D: Desire_Input) and the interference signal level (U: Undesire_Input) is constant.
- This function makes it possible to appropriately control the variable amplifier 12 without being affected by the level difference between the desired signal and the interference signal.
- the gain of the variable amplifying unit 12 is reduced according to the determination output of the signal determining unit 20.
- the gain of the variable amplifying unit 12 is maximized to prevent NF (noise figure) degradation, and conversely, the gain is limited in the case of a large input, thereby causing distortion in the variable amplifying unit 12 and the signal processing unit 14.
- the signal transmission device 1 (for example, a receiving circuit) having a wide dynamic range is configured.
- the variable amplification unit 22 uses a variable gain amplifier that operates with a variable width corresponding to the variable width of the variable amplification unit 12 of the main signal path. .
- the variable amplification unit 22 has a wider bandwidth than the variable amplification unit 12.
- the level determination can be suitably performed, and noise characteristics do not matter so much, so that it is not necessary to be a low noise amplifier.
- size proportional there is an advantage that the characteristics of other points can be made substantially the same as those of the variable amplifying unit 12.
- “Operating with a variable width corresponding to the variable width of the variable amplifier 12 of the main signal path” means that the gain of the variable amplifier 12 which is an example of the first amplifier and the variable amplifier 22 which is an example of the second amplifier.
- the present invention is not limited to this, and there may be some difference. This is because the difference can be offset by providing the level detection unit 24 with an offset function.
- the output signal of the variable amplification unit 22 is supplied to the level detection unit 24.
- the level detection unit 24 detects the signal level from the output of the variable amplification unit 22 and controls the variable amplification unit 12 of the main signal path. As a result, it is possible to realize a gain control method that can expand the dynamic range of the variable amplifying unit 12 without wasting S / N. Due to the effect of the variable amplification unit 22 in the replica signal path, gain control can be performed with a constant level difference (D / U constant) between the desired signal and the interference signal.
- variable amplifying unit 12 Without being affected by the level difference between the interference signal and the desired signal at the input of the variable amplifying unit 12 (regardless of the input level), it is possible to always perform gain control at the optimum operating point, and appropriately adjust the variable amplifying unit 12. Can be controlled.
- a signal transmission device 1 suitable for both NF and dynamic range can be configured.
- FIG. 4 is a diagram illustrating a second modified configuration of the gain control circuit of the present embodiment.
- the gain control circuit 10C of the second modified configuration is different from the gain control circuit 10A of the basic configuration in that the signal determination unit 20 includes a level detection unit 26A, a level detection unit 26B, and a level determination unit 28.
- the other points are the same as the gain control circuit 10A.
- the gain control operation of the variable amplifying unit 12 is performed in a state where the ratio (D / U) between the desired signal level D and the interference signal level U is constant. With this function, the variable amplifying unit 12 can be appropriately controlled without being affected by the level difference between the desired signal and the interference signal.
- the level detection unit 26A detects the level of the desired signal.
- a band-pass filtering circuit that passes the frequency band component of the desired signal through its input stage is used.
- the level detection unit 26B detects the level of an interference signal.
- a band rejection (suppression) filtering circuit band elimination filter, notch filter
- the detection result of the level detection unit 26A and the detection result of the level detection unit 26B are supplied to the level determination unit 28.
- the level determination unit 28 detects the signal level from the detection result of the level detection unit 26A and the detection result of the level detection unit 26B, and controls the variable amplification unit 12 of the main signal path. As a result, it is possible to realize a gain control method capable of expanding the dynamic range of the variable amplification unit 12 without waste of S / N. Due to the effects of the level detection unit 26A, the level detection unit 26B, and the level determination unit 28 of the replica signal path, gain control can be performed with a constant level difference (D / U constant) between the desired signal and the interference signal. Gain control can always be performed at the optimum operating point without being affected by the level difference between the interference signal and the desired signal at the input of the variable amplifier 12.
- a signal transmission device 1 suitable for both NF and dynamic range can be configured.
- an automatic gain control circuit used in a radio communication receiving circuit.
- AGC circuit automatic gain control circuit
- it is used for a receiving circuit in which a received signal fluctuates and a large signal level is received from another transmitting antenna to an adjacent channel, such as a communication device, a TV, or digital audio broadcasting (DAB) that performs mobile communication. It is preferable to apply to an AGC circuit.
- FIG. 5 is a diagram illustrating the communication apparatus (having a reception circuit) according to the first embodiment.
- the communication device 810A includes an input amplification unit 812, a reception-side local oscillation unit 814 that generates a carrier frequency F_ @, a frequency mixing unit 815 (a so-called mixer), a demodulated signal processing unit 816 (for example, a bandpass filter), an output An amplifying unit 817 and a demodulating circuit 818 are provided, and a receiving antenna 811 is connected to the input amplifying unit 812.
- the reception side local oscillation unit 814 and the frequency mixing unit 815 constitute a frequency conversion unit.
- the input amplifying unit 812 multiplies the amplitude of the received signal received by the receiving antenna 811 by a gain, and corresponds to the aforementioned variable amplifying unit 12. From the demodulating circuit 818, the gain control signal GC1 is supplied to the input amplifying unit 812 so that a negative feedback amplifying circuit is configured.
- the communication device 810A selects only a desired frequency by limiting the band of the reception frequency, and a filter circuit 813 (tank circuit) is provided in the load of the input amplification unit 812.
- the filter circuit 813 is an example of a band limiting unit that limits the band of the output signal of the input amplifier 812 to the band of the desired wave.
- a signal determination unit 820A (corresponding to the above-described signal determination unit 20) for determining the input signal level of the input amplification unit 812 is provided in a replica signal path different from the main signal path.
- the signal determination unit 820A includes a level detection unit 824 (corresponding to the level detection unit 24).
- a level detector 824 is provided in front of the input amplifier 812, and the input amplifier 812 is controlled using the detection result as the gain control signal GC2.
- FIG. 6 is a diagram illustrating a configuration example of the input amplification unit 812 (gain control circuit).
- Attenuator circuit 830 is provided at the input stage, and a differential amplifier circuit 840 is connected for each tap output. Incidentally, the input terminal is directly connected to the differential amplifier circuit 840 in the first stage.
- the differential amplifier circuit 840 includes a differential pair of transistors 842 and 844 and a transistor 846 serving as a current source thereof.
- Each tap of the attenuator circuit 830 is sequentially connected to one input terminal of the differential pair of transistors 842 and 844.
- the other input terminals of the transistors 842 and 844 of the differential pair are connected in common and further connected to a feedback circuit that determines the gain.
- This feedback circuit corresponds to that operated by the gain control signal GC1.
- the differential pair operates as a current controlled transconductance (gm) amplifier circuit (Gm-AMP).
- a control signal (corresponding to the gain control signal GC2) for operating any one of the differential pairs is supplied to the control input terminal (gate) of the transistor 846.
- the operating state (gain) at the time of excessive input is determined depending on which stage of the differential pair is operated.
- FIG. 7 is a diagram illustrating the relationship between the input level of the communication apparatus 810A and the SN ratio (SNR).
- FIG. 8 is a diagram showing the relationship between the attenuation of the input amplifier 812, the SN ratio, and IIP3 when the desired wave is ⁇ 30 dBm.
- FIG. 9 is a diagram showing the relationship between the attenuation of the input amplifier 812, the SN ratio, and IIP3 when the desired wave is ⁇ 14 dBm.
- the AGC start point is set to -50 dBm. It can be seen that if the input level is large, the noise characteristics are good.
- FIG. 8 shows an operating point where the desired wave is ⁇ 30 dBm.
- the threshold of the level detection unit 824 is set to ⁇ 30 dBm. For example, assuming that the required IIP3 when the signal level of the jamming wave is ⁇ 14 dBm is +12 dBm, it can be seen that reception is possible when the input amplifier 812 is attenuated by 16 dB.
- FIG. 9 shows an operating point where the desired wave is ⁇ 14 dBm.
- the S / N is further deteriorated even though the operating point of only the desired wave already satisfies the required IIP3. It works like this.
- the communication device 810A according to the first embodiment detects the absolute wave level of the interference wave and controls the gain until the desired wave level exceeds the interference wave level. There are difficulties that cannot be done.
- FIG. 10 is a diagram illustrating the communication apparatus (having a reception circuit) according to the second embodiment.
- the communication device 810B is different from the communication device 810A of the first embodiment in the configuration of the signal determination unit 820.
- the signal determination unit 820B includes a variable amplification unit 822 (corresponding to the variable amplification unit 22) and a level detection unit 824 (corresponding to the level detection unit 24).
- the variable amplifying unit 822 a wide-band variable gain amplifier is used so that interference waves can be properly processed. However, since the noise performance does not need to be good, the variable amplifying unit 822 is reduced in proportion to the size of the variable amplifying unit 812 of the main signal path.
- a signal determination unit 820B is provided in front of the input amplification unit 812, and the input amplification unit 812 is controlled using the detection result as the gain control signal GC2.
- the variable amplifying unit 822 has a variable gain amplifier having the same variable width and wide bandwidth as the input amplifying unit 812 of the main signal path.
- the interference wave can be detected in a wide band without being subjected to the band limitation of the filter circuit 813, and the level difference between the desired wave and the interference wave is constant (D / U constant), gain control can be performed.
- FIG. 11 is a diagram illustrating the operation of the communication apparatus 810B according to the second embodiment.
- FIG. 11 corresponds to FIG. 9 of the first embodiment.
- the amount of attenuation of the input amplifier 812 and S It is the figure which showed / N ratio and IIP3, respectively.
- the input level and SN ratio of the communication device 810B are the same as those shown in FIG.
- the threshold value of the level detection unit 824 is assumed to be ⁇ 30 dBm as in the first embodiment.
- the operation shown in FIG. 8 is performed as in the first embodiment.
- the level calculation of the level detection unit 824 in the communication device 810B according to the second embodiment is as illustrated in FIG.
- the detection threshold is set to ⁇ 30 dBm
- AGC start ⁇ 50 dBm
- the level detection unit 824 controls the input amplification unit 812 to attenuate ⁇ 36 dB (ATT).
- D / U 0 dB
- the input level to the level detection unit 824 is ⁇ 50 dBm, which is equal to or less than the threshold value. For this reason, unnecessary S / N degradation does not occur.
- the input level to the level detection unit 824 is ⁇ 30 dBm, which is just a threshold value.
- ATT attenuation
- the input level to the level detection unit 824 is ⁇ 30 dBm which is just a threshold value
- the state after this state that is, the disturbance wave is ⁇ 30 dBm or more
- gain control can be performed with a level difference between a desired wave and an interference wave and a D / U ratio corresponding to a difference between a detection threshold and an AGC start being constant. it can.
- the gain is not controlled by detecting at the absolute value level of the disturbing wave as in the first embodiment, but the gain control is performed at a constant D / U. Regardless of each input level, gain control can always be performed at an optimum operating point.
- gain control can always be performed at an optimum operating point regardless of the input level.
- FIG. 12 is a diagram for explaining the third embodiment.
- FIG. 12A shows an arrangement image of a plurality of communication devices in the electronic device
- FIG. 12B shows a detailed configuration example of the communication device
- FIG. 12C shows the carrier frequency. An example of frequency arrangement is shown.
- Example 3 is an application example in the case where a plurality of communication devices are arranged in a casing of one electronic device to perform communication. For example, all communication devices (communication chips) are mounted on the same substrate in one electronic device, and each carrier frequency is set in advance. A case is assumed in which three or more transmission / reception combinations are randomly performed on a circuit board in an electronic device regardless of the arrangement and the directivity of radio waves.
- FIG. 12 shows a case where a 3-band frequency arrangement is applied.
- a set of a communication device 710_1 having a transmitter function and a communication device 810_1 having a receiver function, and a transmitter function are provided on the circuit board 701 in the electronic device 751.
- Signal transmission comprising a combination of three sets of transmission / reception including a communication device 710_2 having a receiver function and a communication device 810_2 having a receiver function, a communication device 710_3 having a transmitter function and a communication device 810_3 having a receiver function
- the apparatus 1A is accommodated.
- each of the communication device 710_1, the communication device 710_2, and the communication device 710_3 includes a modulation target signal processing unit 712, a signal amplification unit 713, and a carrier frequency F_n (n is a local frequency). 1, 2 or 3), a transmission side local oscillation unit 714, a frequency mixing unit 715 (so-called mixer), and an output amplification unit 717, and a transmission antenna 718 is connected to the output amplification unit 717. ing.
- the transmission-side local oscillation unit 714 and the frequency mixing unit 715 constitute a modulation unit.
- the modulation target signal processing unit 712 includes, for example, a low-pass filter, and limits the reception bandwidth of the modulated signal.
- the signal amplification unit 713 multiplies the amplitude of the signal output from the modulation target signal processing unit 712 by a gain.
- the frequency mixing unit 715 performs modulation processing by multiplying the signal output from the signal amplification unit 713 by the carrier signal (carrier frequency F_n) from the transmission-side local oscillation unit 714.
- the output amplifier 717 multiplies the amplitude of the signal modulated by the frequency mixer 715 by a gain.
- each of the communication device 810_1, the communication device 810_2, and the communication device 810_3 includes an input amplification unit 812, a reception-side local oscillation unit 814 that generates a carrier frequency F_n, and a frequency mixing unit 815.
- a so-called mixer a demodulated signal processing unit 816 (for example, a low-pass filter), and an output amplifying unit 817, and a receiving antenna 811 is connected to the input amplifying unit 812.
- the reception side local oscillation unit 814 and the frequency mixing unit 815 constitute a demodulation unit.
- the input amplifying unit 812 multiplies the amplitude of the received signal received by the receiving antenna 811 by a gain.
- the frequency mixing unit 815 performs demodulation processing by multiplying the reception signal output from the input amplification unit 812 by the carrier signal (carrier frequency F_n) from the reception-side local oscillation unit 814.
- the demodulated signal processing unit 816 has, for example, a low-pass filter, and limits the reception bandwidth of the demodulated signal.
- the output amplifier 817 multiplies the amplitude of the demodulated signal output from the demodulated signal processor 816 by a gain.
- the modulated signal S711 having the entire reception bandwidth Bw1 is input to the communication device 710_1, modulated by the transmission-side local oscillation unit 714 having the carrier frequency F_1, and transmitted by the transmission antenna 718. , Send radio waves.
- the receiving antenna 811 receives this modulated signal and inputs it to the communication device 810_1, demodulates it by the demodulator, and outputs a demodulated signal S811 from the output amplifier 817.
- the modulated signal S721 having the entire reception bandwidth Bw2 is input to the communication device 710_2, modulated by the transmission-side local oscillation unit 714 having the carrier frequency F_2, and transmitted by the transmission antenna 718. , Send radio waves.
- the receiving antenna 811 receives this modulated signal, inputs it to the communication device 810_2, demodulates it by the demodulator, and outputs a demodulated signal S821 from the output amplifier 817.
- the modulated signal S731 having the entire reception bandwidth Bw3 is input to the communication device 710_3, modulated by the transmission-side local oscillation unit 714 having the carrier frequency F_3, and transmitted by the transmission antenna 718. , Send radio waves.
- the receiving antenna 811 receives this modulated signal, inputs it to the communication device 810_3, demodulates it by the demodulator, and outputs a demodulated signal S831 from the output amplifier 817.
- the carrier frequency F_1, the carrier frequency F_2, and the carrier frequency F_3 are arranged such that the carrier frequency F_1 and the carrier frequency F_2 are separated from each other by a frequency difference D12.
- the band interval between the modulation signal based on the carrier frequency F_1 and the modulation signal based on the carrier frequency F_2 is H12
- the frequency utilization efficiency is high, but cross modulation is a problem.
- a signal of two carrier frequencies that is completely unrelated to the desired wave (own station) is received and input to an amplifier circuit or a frequency mixing circuit having nonlinearity, a signal of the difference between the two carrier frequencies (interference wave) Component) is also output.
- the difference between the two carrier frequencies exists in the vicinity of the frequency of the desired wave, and there is a problem of “intermodulation distortion” in which the interference wave component is also demodulated.
- a first amplifier for amplifying an input signal A gain control circuit comprising: a signal determination unit that determines an input signal input to the first amplifier and controls an amplification factor of the first amplifier based on a determination result.
- a gain control circuit comprising: a signal determination unit that determines an input signal input to the first amplifier and controls an amplification factor of the first amplifier based on a determination result.
- the input signal contains the desired wave and the jamming wave, The gain control circuit according to claim 1, wherein the signal determination unit determines each level of the desired wave and the interference wave.
- a gain control circuit according to Appendix 2 The gain control circuit according to Appendix 2, wherein the signal determination unit determines without distinguishing the level of the desired wave and the level of the interference wave.
- the signal determination unit A second amplifier for amplifying an input signal input to the first amplifier; A level detector for detecting the level of the output signal of the second amplifier, The gain control circuit according to claim 3, wherein the gain of the first amplifier and the gain of the second amplifier are controlled to have a relative relationship.
- the gain control circuit according to claim 4 wherein the gain of the first amplifier and the gain of the second amplifier are controlled to be the same.
- the signal determination unit A first level detector for detecting the level of the desired wave; A second level detector for detecting the level of the jamming wave; The gain control circuit according to appendix 2, further comprising: a level determination unit that controls an amplification factor of the first amplifier based on detection results of the first level detection unit and the second detection unit.
- Appendix 9 The gain control circuit according to any one of appendix 1 to appendix 8, wherein a band limiting unit that limits an output signal band to a desired wave band is provided at an output of the first amplifier.
- a control loop for detecting the signal level corresponding to the output signal level of the first amplifier and controlling the amplification factor of the first amplifier is provided after the first amplifier.
- [Appendix 12] A first amplifier for amplifying an input signal; A signal processing unit for performing signal processing based on a signal output from the first amplifier; An electronic apparatus comprising: a signal determination unit that determines an input signal input to the first amplifier and controls an amplification factor of the first amplifier based on a determination result.
- An electronic apparatus comprising: a signal determination unit that determines a reception signal input to the first amplifier and controls an amplification factor of the first amplifier based on a determination result.
- [Appendix 14] The electronic device according to attachment 13, comprising a plurality of communication units each including a first amplifier, a receiving unit, and a signal determining unit.
- Appendix 15] A gain control method for determining an input signal input to a first amplifier that amplifies an input signal, and controlling an amplification factor of the first amplifier in a feedforward system based on a determination result.
- the input signal contains the desired wave and the jamming wave, The gain control method according to claim 15, wherein the gain of the first amplifier is controlled with a constant level difference between the desired wave and the interference wave.
- SYMBOLS 1 ... Signal processing circuit, 10 ... Gain control circuit, 12 ... Variable amplification part, 14 ... Signal processing part, 20 ... Signal determination part, 22 ... Variable amplification part, 24 ... Level detection part, 26A ... Level detection part, 26B ... Level detection unit, 28 ... level determination unit
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- Control Of Amplification And Gain Control (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
Description
1.全体概要
2.混変調歪について
3.基本構成
4.変形構成1
5.変形構成2
6.具体的な適用例
実施例1:基本構成と対応
実施例2:変形構成1
実施例3:通信装置、電子機器への適用
先ず、基本的な事項について以下に説明する。
以下で説明する基本構成及びその変形例並びに実施例を説明するに当たって、重要な評価ファクタである混変調歪について先ず説明する。図1は、混変調歪を説明する図である。
図2は、本実施形態の利得制御回路の基本構成を説明する図である。利得制御回路10Aは、信号処理回路1に組み込まれており、可変増幅部12と、レベル検出機能を持つ信号処理部14と、信号判定部20とを備えている。
図3は、本実施形態の利得制御回路の第1変形構成を説明する図である。第1変形構成の利得制御回路10Bは、信号判定部20に、可変増幅部22とレベル検出部24とを設けている点が基本構成の利得制御回路10Aと異なる。その他の点は利得制御回路10Aと同じである。
図4は、本実施形態の利得制御回路の第2変形構成を説明する図である。第2変形構成の利得制御回路10Cは、信号判定部20に、レベル検出部26A及びレベル検出部26Bとレベル判定部28とを設けている点が基本構成の利得制御回路10Aと異なる。その他の点は利得制御回路10Aと同じである。
以下に、前述した利得制御回路10の具体的な適用例について説明する。以下では、無線通信用の受信回路に使用される自動利得制御回路(AGC回路)への適用例で説明する。例えば、通信機、TV、或いは移動通信を行なうデジタルオーディオブロードキャスティング(DAB)等、受信信号が変動し、かつ他の送信アンテナから隣接のチャンネルに大きな信号レベルを受けることがある受信回路に用いられるAGC回路へ適用するのが好適である。
図5は、実施例1の通信装置(受信回路を持つ)を説明する図である。通信装置810Aは、入力増幅部812と、搬送周波数F_@を生成する受信側局部発振部814と、周波数混合部815(いわゆるミキサー)と、復調信号処理部816(例えばバンドパスフィルタ)と、出力増幅部817と、復調回路818とを備え、入力増幅部812には受信アンテナ811が接続されている。受信側局部発振部814と周波数混合部815とで周波数変換部が構成される。入力増幅部812は、受信アンテナ811で受けた受信信号の振幅をゲイン倍するものであり、前述の可変増幅部12と対応する。復調回路818からは、ゲイン制御信号GC1が入力増幅部812に供給され、負帰還増幅回路が構成されるようにしている。
図6は、入力増幅部812(利得制御回路)の構成例を示す図である。
図7~図9は、実施例1の通信装置810Aの動作を説明する図である。ここで、図7は、通信装置810Aの入力レベルとSN比(SNR)の関係を示した図である。図8は、希望波が-30dBmのときの入力増幅部812の減衰量とSN比及びIIP3の関係を示した図である。図9は、希望波が-14dBmのときの入力増幅部812の減衰量とSN比及びIIP3の関係を示した図である。
図10は、実施例2の通信装置(受信回路を持つ)を説明する図である。通信装置810Bは、実施例1の通信装置810Aに対して、信号判定部820の構成を変更している。具体的には、信号判定部820Bは、可変増幅部822(可変増幅部22と対応)とレベル検出部824(レベル検出部24と対応)を有する。可変増幅部822としては、妨害波も適正に処理できるように広帯域な可変利得増幅器を使用するが、ノイズ性能は良好である必要がないので主信号パスの可変増幅部812のサイズ比例で小さくしたものを使用する。入力増幅部812の前に信号判定部820Bを設け、その検波結果をゲイン制御信号GC2として用いて入力増幅部812を制御する。
図11は、実施例2の通信装置810Bの動作を説明する図である。ここで、図11は、実施例1の図9と対応し、希望波=-14dBmと希望波=-14dBmのとき(つまりD/U=0dBの場合)の入力増幅部812の減衰量とS/N比及びIIP3をそれぞれ示した図である。
[付記1]
入力信号を増幅する第1増幅器と、
第1増幅器に入力される入力信号を判定し、判定結果に基づいて第1増幅器の増幅率を制御する信号判定部
とを備えた利得制御回路。
[付記2]
入力信号は希望波と妨害波とを含み、
信号判定部は、希望波と妨害波の各レベルを判定する
付記1に記載の利得制御回路。
[付記3]
信号判定部は、希望波のレベルと妨害波のレベルを区別することなく判定する
付記2に記載の利得制御回路。
[付記4]
信号判定部は、
第1増幅器に入力される入力信号を増幅する第2増幅器と、
第2増幅器の出力信号のレベルを検出するレベル検出部
とを有し、
第1増幅器の増幅率と第2増幅器の増幅率とは相対関係を持って制御される
付記3に記載の利得制御回路。
[付記5]
第1増幅器の増幅率と第2増幅器の増幅率とは同じに制御される
付記4に記載の利得制御回路。
[付記6]
第2増幅器は第1増幅器に対してサイズ比例で小さい
付記4又は付記5に記載の利得制御回路。
[付記7]
信号判定部は、
希望波のレベルを検出する第1レベル検出部と、
妨害波のレベルを検出する第2レベル検出部と、
第1レベル検出部と第2検出部の検出結果に基づいて第1増幅器の増幅率を制御するレベル判定部
とを有する付記2に記載の利得制御回路。
[付記8]
希望波と妨害波のレベル差一定で第1増幅器の増幅率を制御する
付記4乃至付記7の何れか1項に記載の利得制御回路。
[付記9]
第1増幅器の出力には、出力信号の帯域を希望波の帯域に制限する帯域制限部が設けられている
付記1乃至付記8の何れか1項に記載の利得制御回路。
[付記10]
第1増幅器の後段に、第1増幅器の出力信号のレベルと対応した信号のレベルを検出して第1増幅器の増幅率を制御する制御ループが設けられている
付記1乃至付記9の何れか1項に記載の利得制御回路。
[付記11]
受信信号を増幅する第1増幅器と、
第1増幅器から出力された信号に基づいて受信処理を行なう受信部と、
第1増幅器に入力される受信信号を判定し、判定結果に基づいて第1増幅器の増幅率を制御する信号判定部
とを備えた通信装置。
[付記12]
入力信号を増幅する第1増幅器と、
第1増幅器から出力された信号に基づいて信号処理を行なう信号処理部と、
第1増幅器に入力される入力信号を判定し、判定結果に基づいて第1増幅器の増幅率を制御する信号判定部
とを備えた電子機器。
[付記13]
受信信号を増幅する第1増幅器と、
第1増幅器から出力された信号に基づいて受信処理を行なう受信部と、
第1増幅器に入力される受信信号を判定し、判定結果に基づいて第1増幅器の増幅率を制御する信号判定部
とを備えた電子機器。
[付記14]
第1増幅器、受信部、及び、信号判定部を具備する通信部を複数備えた
付記13に記載の電子機器。
[付記15]
入力信号を増幅する第1増幅器に入力される入力信号を判定し、判定結果に基づいて、フィードフォワード系で第1増幅器の増幅率を制御する
利得制御方法。
[付記16]
入力信号は希望波と妨害波とを含み、
希望波と妨害波のレベル差一定で第1増幅器の増幅率を制御する
付記15に記載の利得制御方法。
Claims (17)
- 入力信号を増幅する第1増幅器と、
第1増幅器に入力される入力信号を判定し、判定結果に基づいて第1増幅器の増幅率を制御する信号判定部
とを備えた利得制御回路。 - 入力信号は希望波と妨害波とを含み、
信号判定部は、希望波と妨害波の各レベルを判定する
請求項1に記載の利得制御回路。 - 信号判定部は、希望波のレベルと妨害波のレベルを区別することなく判定する
請求項2に記載の利得制御回路。 - 信号判定部は、
第1増幅器に入力される入力信号を増幅する第2増幅器と、
第2増幅器の出力信号のレベルを検出するレベル検出部
とを有し、
第1増幅器の増幅率と第2増幅器の増幅率とは相対関係を持って制御される
請求項3に記載の利得制御回路。 - 希望波と妨害波のレベル差一定で第1増幅器の増幅率を制御する
請求項4に記載の利得制御回路。 - 第1増幅器の増幅率と第2増幅器の増幅率とは同じに制御される
請求項5に記載の利得制御回路。 - 第2増幅器は第1増幅器に対してサイズ比例で小さい
請求項6に記載の利得制御回路。 - 信号判定部は、
希望波のレベルを検出する第1レベル検出部と、
妨害波のレベルを検出する第2レベル検出部と、
第1レベル検出部と第2検出部の検出結果に基づいて第1増幅器の増幅率を制御するレベル判定部
とを有する請求項2に記載の利得制御回路。 - 希望波と妨害波のレベル差一定で第1増幅器の増幅率を制御する
請求項8に記載の利得制御回路。 - 第1増幅器の出力には、出力信号の帯域を希望波の帯域に制限する帯域制限部が設けられている
請求項1に記載の利得制御回路。 - 第1増幅器の後段に、第1増幅器の出力信号のレベルと対応した信号のレベルを検出して第1増幅器の増幅率を制御する制御ループが設けられている
請求項1に記載の利得制御回路。 - 受信信号を増幅する第1増幅器と、
第1増幅器から出力された信号に基づいて受信処理を行なう受信部と、
第1増幅器に入力される受信信号を判定し、判定結果に基づいて第1増幅器の増幅率を
制御する信号判定部
とを備えた通信装置。 - 入力信号を増幅する第1増幅器と、
第1増幅器から出力された信号に基づいて信号処理を行なう信号処理部と、
第1増幅器に入力される入力信号を判定し、判定結果に基づいて第1増幅器の増幅率を制御する信号判定部
とを備えた電子機器。 - 受信信号を増幅する第1増幅器と、
第1増幅器から出力された信号に基づいて受信処理を行なう受信部と、
第1増幅器に入力される受信信号を判定し、判定結果に基づいて第1増幅器の増幅率を制御する信号判定部
とを備えた電子機器。 - 第1増幅器、受信部、及び、信号判定部を具備する通信部を複数備えた
請求項14に記載の電子機器。 - 入力信号を増幅する第1増幅器に入力される入力信号を判定し、判定結果に基づいて、フィードフォワード系で第1増幅器の増幅率を制御する
利得制御方法。 - 入力信号は希望波と妨害波とを含み、
希望波と妨害波のレベル差一定で第1増幅器の増幅率を制御する
請求項16に記載の利得制御方法。
Priority Applications (5)
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EP12757216.2A EP2688214A4 (en) | 2011-03-16 | 2012-03-07 | GAIN CONTROL CIRCUIT, COMMUNICATION APPARATUS, ELECTRONIC DEVICE, AND GAIN CONTROL METHOD |
RU2013141452/08A RU2013141452A (ru) | 2011-03-16 | 2012-03-07 | Схема регулировки усиления, устройство связи, электронное устройство и способ регулировки усиления |
BR112013023044A BR112013023044A2 (pt) | 2011-03-16 | 2012-03-07 | circuito e método de controle de ganho, dispositivo de comunicação, e, aparelho eletrônico |
US14/002,907 US9184718B2 (en) | 2011-03-16 | 2012-03-07 | Gain control circuit, communication device, electronic appliance, and gain control method |
CN201280012201.2A CN103415998B (zh) | 2011-03-16 | 2012-03-07 | 增益控制电路,通信装置,电子设备和增益控制方法 |
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- 2012-03-07 EP EP12757216.2A patent/EP2688214A4/en not_active Withdrawn
- 2012-03-07 US US14/002,907 patent/US9184718B2/en active Active
- 2012-03-07 RU RU2013141452/08A patent/RU2013141452A/ru unknown
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Also Published As
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CN103415998B (zh) | 2015-12-23 |
RU2013141452A (ru) | 2015-03-20 |
US9184718B2 (en) | 2015-11-10 |
BR112013023044A2 (pt) | 2016-12-13 |
EP2688214A1 (en) | 2014-01-22 |
CN103415998A (zh) | 2013-11-27 |
JP2012195735A (ja) | 2012-10-11 |
US20130335146A1 (en) | 2013-12-19 |
EP2688214A4 (en) | 2014-08-13 |
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