WO2016031184A1 - 自動利得制御方法及び自動利得制御回路 - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/52—TPC using AGC [Automatic Gain Control] circuits or 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
- H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
-
- 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
-
- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
- H04B1/0007—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at radiofrequency or intermediate frequency stage
- H04B1/0017—Digital filtering
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
- H04B1/1036—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2628—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA]
Definitions
- the present invention relates to an automatic gain control method and an automatic gain control circuit used in a wireless communication device or the like.
- the fluctuation range of the intensity of the received signal input via the antenna is large.
- the apparatus is configured to receive a weak signal, receiving an excessive signal causes adverse effects such as distortion. Therefore, an automatic gain control (AGC) circuit that controls the gain in signal amplification based on fluctuations in signal intensity and suppresses fluctuations in intensity and supplies an input signal to a subsequent circuit is used. ing.
- AGC automatic gain control
- FIG. 6 shows a configuration of a general radio frequency (RF) front end provided in a receiver in the related art.
- the RF front end amplifies the signal received by the antenna 11 and converts it into a digital signal, and has an automatic gain control function.
- a low noise amplifier (LNA) 12 for amplifying a received signal is connected to the antenna 11.
- the output of the LNA 12 is supplied to a band-pass filter (BPF: band-pass filter) 14 that passes only a signal in a desired frequency band through an amplifier circuit 13.
- BPF band-pass filter
- a signal having a desired frequency that has passed through the BPF 14 is then amplified by a variable gain amplifier 15 and converted into a digital signal by an analog-to-digital converter (ADC) 16.
- ADC analog-to-digital converter
- the converted digital signal is supplied to, for example, a digital signal processing unit of the receiver.
- the variable gain amplifier 15 is an amplifier whose gain changes according to the control signal, and the control signal is, for example, a voltage signal.
- a control circuit 17 is provided for generating a control signal. The control circuit 17 generates a control signal based on the signal strength detected by the ADC 16 so that the signal level input to the ADC 16 becomes constant by reducing the gain of the variable gain amplifier 15 when the signal strength is high. This is supplied to the variable gain amplifier 15.
- the variable gain amplifier 15 and the control circuit 17 constitute an automatic gain control circuit.
- the automatic gain control circuit does not limit the gain in the variable gain amplifier 15 when the intensity of the signal detected on the output side of the variable gain amplifier 15 is below a certain threshold value.
- the variable gain amplifier when the intensity of a signal detected on the output side of the variable gain amplifier 15 is not more than a certain threshold value, the variable gain amplifier is generally operated at the maximum gain. is there.
- the thermal noise of the LNA 12 is dominant in the input signal to the variable gain amplifier 15. Therefore, when the input signal to the ADC 16 obtained by amplifying such an input voltage with the variable gain amplifier 15 is represented by the frequency distribution of the signal voltage when the signal is integrated, as shown in FIG. A close distribution is shown. In such a case, the ADC 16 having a small bit number such as 2 bits is used. In the case of using an ADC of 2 bits or more, a signal that saturates the ADC is allowed to be input to the ADC 16. ADC saturation means that an input signal that exceeds the dynamic range of the ADC is input to the ADC.
- the threshold of automatic gain control is about 30% of the entire input signal distribution represented by a normal distribution. It is set to be outside the dynamic range of the ADC 16. Examples of signals that are weakly received by direct spread spectrum spread modulation include GPS signals received from GPS (Global Positioning System) satellites.
- a disturbance with a sharp frequency spectrum may be input by overlapping a weak but weak signal.
- the result of the automatic gain control is that the signal at the point [A] in FIG. 6, that is, the input signal of the ADC 16 has a sufficient level of the received signal as the desired signal. Included.
- the thermal noise of the LNA 12 is dominant in the input signal of the variable gain amplifier 15, but here, since the signal subjected to spread spectrum modulation is used as the received signal, the level of the received signal is relative to the noise power. If the ratio is greater than or equal to the ratio, a desired result can be obtained by digitally processing the output digital signal from the ADC 16.
- Patent Document 1 discloses a technique for preventing the influence of disturbance input superimposed on a weak received signal in a wide band.
- Patent Document 1 discloses that an ADC provided in a subsequent stage of a variable gain amplifier is prevented from being saturated by an interference wave.
- Patent Document 1 discloses that a variable frequency band limiting filter functioning as a notch filter is provided in front of a variable gain amplifier, and the frequency of the interference wave is removed by the filter by detecting the frequency of the interference wave. .
- Patent Document 2 a technique for reducing the influence of an interference wave from a channel adjacent to a desired wave is disclosed in Patent Document 2.
- Patent Document 2 a narrow-band analog bandpass filter to which an output signal from a variable gain amplifier is supplied is provided, and this filter is set so that the frequency of the disturbing wave is outside the passband. It is disclosed that automatic gain control is performed based on the above.
- Patent Document 3 a variable band digital filter tuned to a desired wave is provided after the ADC, and the output of the variable gain amplifier is supplied to the ADC to convert it into a digital signal. Based on the amplitude of the digital signal, a variable gain is obtained. Controlling the gain of the amplifier is disclosed.
- Patent Document 3 discloses that the band pass characteristic of a band variable digital filter is controlled to reduce the influence of an interference wave.
- Patent Document 4 discloses that desired signal power and interference signal power are obtained by filtering from a signal after quadrature detection, and automatic gain control is performed by a variable gain amplifier following only the desired signal power.
- Patent Document 1 The method described in Patent Document 1 as a method for reducing the influence of disturbance input when a disturbance input overlaps a weak received signal with a wide band is a variable frequency functioning as a notch filter provided in the preceding stage of a variable gain amplifier.
- a band limiting filter is used.
- this filter is an analog filter, and it is difficult to accurately control the filter so as to obtain a desired filter characteristic, and there is a problem that the circuit scale becomes large.
- An object of the present invention is an automatic gain control method using a variable gain amplifier that amplifies a received signal, which can reduce the circuit scale and that is superposed on a frequency band of a received signal that is a desired signal.
- An object of the present invention is to provide an automatic gain control method capable of reducing the influence of input.
- Another object of the present invention is an automatic gain control circuit having a variable gain amplifier for amplifying a received signal, having a small circuit scale, and a disturbance input for superimposing within a frequency band of a received signal which is a desired signal. It is an object of the present invention to provide an automatic gain control circuit capable of reducing the influence of the above.
- an automatic gain control method in a receiver having a variable gain amplifier to which a received signal is input and an analog / digital converter connected to the output of the variable gain amplifier is provided within a frequency band of the received signal. Selecting a frequency having a lower signal level output from the analog / digital converter than the other frequencies in the plurality of frequencies, and selecting the frequency at the output of the analog / digital converter Determining the gain in the variable gain amplifier based on the signal strength of the component.
- an automatic gain control method in a receiver having a variable gain amplifier to which a received signal is input and an analog / digital converter connected to the output of the variable gain amplifier is provided. Selecting a frequency band that deviates from the frequency of the disturbance input superimposed on the received signal, and the gain of the variable gain amplifier based on the signal strength of the component of the selected frequency band at the output of the analog / digital converter. Determining.
- an automatic gain control circuit including a variable gain amplifier for receiving a received signal and supplying an output of the variable gain amplifier to an analog / digital converter is provided.
- a frequency selection circuit that selects a signal within a frequency band of the received signal that is narrower than this frequency band, and generates a control signal for the variable gain amplifier based on the strength of the signal selected by the frequency selection circuit A control signal generation circuit.
- the present invention it is possible to perform automatic gain control based on the signal intensity of the selected frequency component by selecting a frequency that is not affected by the disturbance input from the frequency band of the received signal. Therefore, it is possible to reduce the influence of disturbance input superimposed on the frequency band of the received signal, and to obtain an effect that signal processing at a high signal level can be performed on the received signal.
- FIG. 5 is a diagram for explaining the operation of the circuit shown in FIG. 4. It is a circuit diagram which shows the structure of a general RF front end. It is a figure explaining the level setting in automatic gain control.
- FIG. 1 shows an automatic gain control circuit in a basic embodiment.
- This automatic gain control circuit is preferably used in a receiver that amplifies a received signal that is an analog signal and then converts the amplified signal into a digital signal by an analog / digital converter (ADC).
- ADC analog / digital converter
- the received signal which is a desired signal is, for example, a wideband signal modulated by spread spectrum modulation, and has a frequency band of several MHz, for example.
- the automatic gain control circuit includes a variable gain amplifier 15 that receives a received signal and amplifies the received signal.
- the output of the variable gain amplifier 15 is supplied to an ADC 16 that converts the received signal into a digital signal.
- the digital signal output from the ADC 16 is supplied to, for example, a signal processing unit provided in the receiver.
- the gain in the variable gain amplifier 15 is controlled by a control signal.
- the automatic gain control circuit generates a control signal in accordance with the output of the ADC 16 and performs automatic gain control.
- the automatic gain control circuit includes a frequency selection circuit 18 that is connected to the output of the ADC 16 and selects a signal within a frequency band of the received signal that is narrower than this frequency band.
- the automatic gain control circuit also includes a control signal generation circuit 19 that generates a control signal for the variable gain amplifier 15 based on the intensity of the signal selected by the frequency selection circuit 18.
- the frequency selection circuit 18 selects a frequency having a lower signal level output from the ADC 16 than a plurality of other frequencies in the frequency band of the received signal.
- the frequency selection circuit 18 extracts from the output of the ADC 16 a component in the frequency range that is not affected by the disturbance. . This is because automatic gain control is performed by generating a control signal to the variable gain amplifier 15 on the basis of the signal intensity of the extracted component. Therefore, as the frequency selection circuit 18, a circuit that selects a frequency band that deviates from the frequency of the disturbance input superimposed on the received signal from the frequency band of the received signal can be used.
- a digital filter can be used for the frequency selection circuit 18 as described later.
- the digital filter has a pass band that is narrower than the frequency band of the received signal.
- the pass band of the digital filter is set to a frequency at which the level at the output of the ADC 16 is relatively low.
- the pass band of the digital filter is set to a band out of the frequency of the disturbance input in the frequency band of the received signal.
- the control signal generation circuit 19 When such a frequency selection circuit 18 is used, the influence of disturbance input is not exerted at the frequency selected by the frequency selection circuit 18. As a result, the control signal generation circuit 19 generates a control signal for the variable gain amplifier 16 based on the received signal and a noise component that does not depend on the frequency, such as thermal noise, without depending on the magnitude of the disturbance.
- being independent of frequency means that it is substantially independent of frequency within the frequency band of the received signal.
- the gain of the variable gain amplifier 15 since the magnitude of the disturbance is not reflected in the automatic gain control, the gain of the variable gain amplifier 15 becomes larger than when performing the automatic gain control reflecting the magnitude of the disturbance, and as a result, The ADC 16 is likely to be saturated.
- the ADC 16 is used while allowing saturation as described above. Therefore, when the disturbance is superimposed on the frequency band of the received signal, the magnitude of the disturbance is automatically gained. Even if it is not reflected in the control, there is no adverse effect on the subsequent signal processing. Rather, since the level of the received signal component can be kept high at the input of the ADC 16, the received signal obscured by noise such as thermal noise can be handled more appropriately in the subsequent signal processing. Degradation of machine functions and performance can be prevented. Specifically, assuming that the received signal is a signal by spread spectrum modulation, the automatic gain control circuit of the present embodiment reverses the received signal even if there is a significant disturbance superimposed on the received signal. Diffusion can be performed reliably.
- circuit adjustment is unnecessary and a more stable automatic gain control operation can be realized.
- circuit scale can be reduced as compared with the case where an analog filter is used.
- FIG. 2 shows an example of an RF (high frequency) front end including an automatic gain control circuit according to an embodiment of the present invention.
- the RF front end shown in FIG. 2 has an automatic gain control function, and processes a signal received by the antenna 11 and outputs it as a digital signal.
- the received signal is, for example, a signal by direct spread spectrum spread modulation, and a representative signal is a GPS signal.
- the RF front end shown in FIG. 2 includes an LNA (low noise amplifier) 12 connected to the antenna 11 and an amplifier circuit 13 provided at the output of the LNA 12. Yes.
- LNA low noise amplifier
- the RF front end includes a BPF (band pass filter) 14 that is provided at the output of the amplifier circuit 13 and passes only a signal in a desired frequency band, and a variable gain amplifier 15 to which the output of the BPF 14 is input.
- the amplifier circuit 13 has a function of further amplifying the reception signal output from the LNA 12, but may further have a function of converting the frequency of the reception signal.
- the signal supplied to the BPF 14 becomes a reception signal after frequency conversion.
- the pass band of the BPF 14 is set corresponding to the frequency band of the received signal. If the received signal is a GPS signal, the pass band width of the BPF 14 is set to about 5 to 10 MHz, for example.
- the signal output from the variable gain amplifier 15 whose gain changes according to the control signal is supplied to an ADC (analog / digital converter) 16 and converted into a digital signal.
- the converted digital signal is supplied to, for example, a signal processing unit of a receiver including the RF front end.
- ADC 16 for example, an ADC having a low bit number such as 2 bits is used.
- a digital filter 21 to which a digital signal output from the ADC 16 is input, an amplitude detection circuit 22 that detects the amplitude of the output signal of the digital filter 21, and an amplitude detection circuit 22 A digital loop filter 23 to which an output is input, and a digital / analog converter (DAC: digital-) which converts a digital signal output from the digital loop filter 23 into an analog signal and supplies the analog signal to a variable gain amplifier 15 as a control signal which is a voltage signal. to-analog converter 24).
- DAC digital-
- the digital filter 21 has a narrower pass band than the pass band of the BPF 14, and the frequency of the pass band of the digital filter 21 is that of the digital filter 21 when considering the level for each frequency in the digital signal output from the ADC 16.
- the passband is set to a frequency at which the level at the output of the ADC 16 is relatively low.
- the pass band of the digital filter 21 is set to a band that deviates from the frequency of the disturbance input.
- the variable gain amplifier 15, the digital filter 21, the amplitude detection circuit 22, the digital loop filter 23, and the DAC 24 constitute an automatic gain control circuit.
- the received signal which is a desired signal has a distribution in which noise independent of frequency such as thermal noise caused by the LNA 12 in the previous stage overlaps.
- the amplitude detected by the amplitude detection circuit 22 does not include the influence of the external input, and is the original received signal amplitude. It depends on.
- the control signal obtained by supplying the output of the amplitude detection circuit 22 to the DAC 24 via the digital loop filter 23 and converting it into an analog signal is not affected by the disturbance input, and reflects the magnitude of the disturbance. Automatic gain control is not performed. Also in the circuit of the present embodiment, the reception signal buried in noise such as thermal noise can be more appropriately handled in the subsequent signal processing, similarly to the circuit shown in FIG. Performance degradation can be prevented.
- the circuit shown in FIG. 2 does not require an analog filter for generating a control signal, and thus has an advantage that the circuit scale can be reduced.
- the pass band of the digital filter 21 it is necessary to set the pass band of the digital filter 21 so as to deviate from the frequency of the disturbance input. If the frequency of the disturbance input is known, the setting of the digital filter 21 is easy, but if the frequency of the disturbance input is unknown or the frequency of the disturbance input fluctuates, the digital filter 21 having a fixed pass band. It is inappropriate to use. In such a case, the amplitude of the output of the digital filter 21 is detected by the amplitude detection circuit 22 while changing the center frequency using the digital filter 21 that makes the center frequency of the pass band variable. What is necessary is just to find the center frequency with the smallest amplitude and to set the pass band of the digital filter 21 by the center frequency.
- a digital filter that makes the center frequency of the pass band variable tends to have a complicated circuit configuration.
- the variable frequency digital filter that can be used in this embodiment, the one shown in FIG. 3 can be used. That is, as a variable frequency digital filter, an oscillation waveform generation circuit 27 that generates an oscillation waveform of a variable frequency as a digital signal, a multiplication circuit 28 that multiplies the output of the ADC 16 and the output of the oscillation waveform generation circuit 27, and the multiplication circuit 28 What consists of the digital low-pass filter 29 into which an output is input can be used.
- the cutoff frequency of the digital low-pass filter 29 is set to a frequency converted from the pass bandwidth as the digital filter 21.
- the cut-off frequency of the digital low-pass filter 29 may be matched with the pass bandwidth as the digital filter 21.
- the oscillation waveform generated by the oscillation waveform generation circuit 27 is a sine wave, and the multiplication circuit 28 performs digital multiplication. If the result is supplied to the digital low-pass filter 29, as a whole, it functions as a digital filter in which the center frequency of the pass band is determined by the frequency of the waveform generated by the oscillation waveform generation circuit 27. If the amplitude is detected by the amplitude detection circuit 22 while sweeping the frequency of the waveform generated by the oscillation waveform generation circuit 27 and the frequency sweep is stopped at the point where the amplitude is minimized, the ADC 16 outputs within the frequency band of the received signal. The frequency with the lowest signal level is selected.
- FIG. 4 shows an example of the configuration of an RF front end including an automatic gain control circuit configured to supply the output of the ADC 16 in parallel to a plurality of digital filters.
- the RF front end shown in FIG. 4 is provided with an LNA 12, an amplifier circuit 13, a BPF 14, a variable gain amplifier 15 and an ADC 16 in the same manner as the RF front end shown in FIG. 2, and the output of the ADC 16 is in a receiver including this RF front end.
- n digital filters 21 are provided in which n is an integer of 2 or more and the output of the ADC 16 is input in parallel. n is typically an integer from 3 to 10.
- the pass bands of these n digital filters 21 are all narrower than the pass band of the BPF 14, and their center frequencies are different from each other.
- An amplitude detection circuit 22 is connected to the output of each digital filter 21 to detect the output of the corresponding digital filter 21.
- a selection circuit 25 for inputting the amplitude detected by the n amplitude detection circuits is provided, and the selection circuit 25 selects and outputs the smallest one of the input amplitudes in a state where a disturbance is input.
- the RF front end is provided with a digital loop filter 23 to which the output of the selection circuit 25 is input, and a DAC 24 that converts the output of the digital loop filter 23 into an analog signal and supplies it as a control signal to the variable gain amplifier 25.
- the variable gain amplifier 15, n digital filters 21, n amplitude detection circuits 22, selection circuit 25, digital loop filter 23, and DAC 24 constitute an automatic gain control circuit.
- the frequency band of the received signal has three bands, band 1, band 2, and band 3, as indicated by reference numeral 40 in the figure. It is divided into. These three bands correspond to the pass bands of the three digital filters 21, respectively.
- a disturbance having a sharp frequency spectrum is input in the band 2 in the input signal distribution of the variable gain amplifier.
- the frequency of the disturbance is a position close to band 1 in band 2.
- the magnitude of the amplitude is band 2> band 1> band 3.
- Reference numeral 41 in FIG. 5 indicates a signal distribution at the output of the digital filter 21 when a control signal for the variable gain amplifier 15 is generated based on the amplitude of the output of the digital filter 21 corresponding to the band 1. Yes.
- reference numeral 42 indicates a signal distribution at the output of the digital filter 21 when a control signal for the variable gain amplifier 15 is generated based on the amplitude of the output of the digital filter 21 corresponding to the band 2.
- Reference numeral 43 indicates a signal distribution at the output of the digital filter 21 when a control signal for the variable gain amplifier 15 is generated based on the amplitude of the output of the digital filter 21 corresponding to the band 3. When these signal distributions 41 to 43 are compared, the signal distribution 43 corresponding to the band 3 has the largest signal level.
- the band 3 is least affected by the disturbance input among the bands 1 to 3.
- the signal level is overwhelmingly small due to the influence of the disturbance included in the band 2. Therefore, if automatic gain control is performed based on the amplitude in band 2, the gain of variable gain amplifier 15 is reduced due to the influence of disturbance, and the reception level of the received signal, which is a desired signal, is reduced. Even if the disturbance frequency is in the band 2, the influence of the disturbance also affects the band 1 due to the frequency characteristics of the filter. It should be noted that the signal distributions 41 to 43 in FIG. 5 are obtained under different gains in the variable gain amplifier 15.
- the amplitude of the output of the digital filter 21 corresponding to the band 3 is selected by the selection circuit 25 and supplied to the digital loop filter 23 to generate a control signal for the variable gain amplifier 15. To do.
- the control signal is generated in this way, automatic gain control is performed without being affected by disturbance input.
- the signal level of the received signal component in the signal input to the ADC 16 can be maintained high, so that subsequent signal processing can be performed more appropriately, and deterioration of the function and performance of the receiver can be prevented.
- the digital filter 21 selected by the selection circuit 25 also changes following the change, and the band having the minimum amplitude is always selected. Therefore, even if there is a change in the frequency of the disturbance input, automatic gain control is always performed based on a signal in a band where the signal level of the received signal is high without being affected by the disturbance input.
- Antenna Low noise amplifier (LNA) 13 Amplifier 14 Bandpass filter (BPF) 15 Variable Gain Amplifier 16 Analog / Digital Converter (ADC) 17 control circuit 18 frequency selection circuit 19 control signal generation circuit 21 digital filter 22 amplitude detection circuit 23 digital loop filter 24 digital / analog converter (DAC) 25 Selection Circuit 27 Oscillation Waveform Generation Circuit 28 Multiplication Circuit 29 Digital Low-Pass Filter
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Abstract
Description
12 低雑音増幅器(LNA)
13 増幅回路
14 帯域通過フィルタ(BPF)
15 可変利得増幅器
16 アナログ/デジタル変換器(ADC)
17 制御回路
18 周波数選択回路
19 制御信号生成回路
21 デジタルフィルタ
22 振幅検出回路
23 デジタルループフィルタ
24 デジタル/アナログ変換器(DAC)
25 選択回路
27 発振波形発生回路
28 乗算回路
29 デジタル低域通過フィルタ
Claims (16)
- 受信信号が入力する可変利得増幅器と前記可変利得増幅器の出力に接続するアナログ/デジタル変換器とを有する受信機における自動利得制御方法であって、
前記受信信号の周波数帯域内の複数の周波数の中から、該複数の周波数の中の他の周波数よりも前記アナログ/デジタル変換器が出力する信号レベルが小さい周波数を選択することと、
前記アナログ/デジタル変換器の出力における前記選択された周波数の成分の信号強度に基づいて前記可変利得増幅器における利得を決定することと、
を有する方法。 - 前記選択することは、前記周波数帯域よりも狭い通過帯域を有するデジタルフィルタに前記アナログ/デジタル変換器の出力を供給することを有する、請求項1に記載の方法。
- 前記デジタルフィルタは中心周波数が可変であるデジタルフィルタであり、
前記選択することは、前記中心周波数を変化させながら前記デジタルフィルタの出力の振幅を検出し、該振幅が最小となる中心周波数を選択することを有する、請求項2に記載の方法。 - 前記選択することは、前記周波数帯域を複数の帯域に分割し、帯域ごとの前記受信信号の振幅を検出して振幅が最小である帯域を選択することを有し、
前記決定することは、前記選択された帯域での振幅に基づいて前記可変利得増幅器における利得を決定することを有する、請求項1に記載の方法。 - 前記帯域を選択することは、前記周波数帯域よりも狭い通過帯域をそれぞれ有し、前記周波数帯域内にあって相互に異なる中心周波数を有する複数のデジタルフィルタに前記アナログ/デジタル変換器の出力を供給することと、
前記複数のデジタルフィルタの各々の出力の振幅を検出し、振幅が最小となるデジタルフィルタの出力を選択することと、
を有する、請求項4に記載の方法。 - 受信信号が入力する可変利得増幅器と前記可変利得増幅器の出力に接続するアナログ/デジタル変換器とを有する受信機における自動利得制御方法であって、
前記受信信号の周波数帯域の中から、前記受信信号に重畳する外乱入力の周波数から外れる周波数帯域を選択することと、
前記アナログ/デジタル変換器の出力における前記選択された周波数帯域の成分の信号強度に基づいて前記可変利得増幅器における利得を決定することと、
を有する方法。 - 前記選択することは、前記周波数帯域よりも狭い通過帯域を有するデジタルフィルタに前記アナログ/デジタル変換器の出力を供給することを有する、請求項6に記載の方法。
- 前記受信信号は、直接拡散スペクトラム拡散変調による信号である、請求項1乃至7のいずれか1項に記載の方法。
- 受信信号が入力する可変利得増幅器を備え、前記可変利得増幅器の出力をアナログ/デジタル変換器に供給する自動利得制御回路であって、
前記アナログ/デジタル変換器の出力に接続し、前記受信信号の周波数帯域内の、該周波数帯域よりも狭い帯域の信号を選択する周波数選択回路と、
前記周波数選択回路が選択した信号の強度に基づいて前記可変利得増幅器に対する制御信号を生成する制御信号生成回路と、
を有する回路。 - 前記周波数選択回路は、前記アナログ/デジタル変換器の出力に接続し、前記周波数帯域よりも狭い通過帯域を有するデジタルフィルタである、請求項9に記載の回路。
- 前記通過帯域は、前記受信信号に重畳する外乱入力の周波数から外れる周波数帯域である、請求項10に記載の回路。
- 前記デジタルフィルタは、中心周波数が可変であるデジタルフィルタであり、
前記中心周波数を変化させながら前記デジタルフィルタの出力の振幅を検出し、該振幅が最小となる中心周波数での前記デジタルフィルタの出力に基づいて前記制御信号を生成する、請求項10に記載の回路。 - 前記デジタルフィルタは、
デジタル信号として可変周波数の発振波形を発生する発振波形発生回路と、
前記アナログ/デジタル変換器の出力と前記発振波形発生回路の出力とを乗算する乗算回路と、
前記乗算回路の出力が入力するデジタル低域通過フィルタと、
を有する、請求項12に記載の回路。 - 前記制御信号生成回路は、
前記デジタルフィルタの出力の振幅を検出する振幅検出回路と、
前記振幅検出回路の出力が入力するデジタルループフィルタと、
前記デジタルループフィルタの出力をアナログ信号に変換して前記制御信号として前記可変利得増幅器に供給するデジタル/アナログ変換器と、
を有する、請求項9乃至13のいずれか1項に記載の回路。 - 前記周波数選択回路は、
前記周波数帯域よりも狭い通過帯域をそれぞれ有し、中心周波数が相互に異なる複数のデジタルフィルタと、
前記複数のデジタルフィルタの出力の振幅をそれぞれ検出する複数の振幅検出回路と、 前記複数の振幅検出回路で検出された振幅のうち最小のものを検出して出力する選択回路と、
を有する、請求項9に記載の回路。 - 前記制御信号生成回路は、
前記選択回路の出力が入力するデジタルループフィルタと、
前記デジタルループフィルタの出力をアナログ信号に変換して前記制御信号として前記可変利得増幅器に供給するデジタル/アナログ変換器と、
を有する、請求項15に記載の回路。
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