CN114301479A - Power line carrier communication receiver and control method thereof - Google Patents
Power line carrier communication receiver and control method thereof Download PDFInfo
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Abstract
According to the present disclosure, a power line carrier communication receiver includes a first variable gain amplifier, a second variable gain amplifier, a third variable gain amplifier, an analog-to-digital converter, and an automatic gain control unit, which are sequentially cascaded; the automatic gain control unit is respectively in communication connection with the output end of the analog-to-digital converter, the control end of the first variable gain amplifier, the control end of the second variable gain amplifier and the control end of the third variable gain amplifier, and is used for controlling the first variable gain amplifier, the second variable gain amplifier and the third variable gain amplifier according to the digital signals output by the analog-to-digital converter. The power line carrier communication receiver and the control method thereof provided by the disclosure are implemented to improve the anti-attenuation capability of the receiver.
Description
Technical Field
The invention relates to the technical field of integrated circuits, in particular to a power line carrier communication receiver and a control method thereof.
Background
Power line carrier communication technology has been popular in the 20 th century. The information transmission interaction is realized by using the existing low-voltage distribution network as a signal transmission medium. In recent years, with the progress of semiconductor and chip technologies, power line carrier communication technologies have been rapidly developed. In order to meet the requirements of longer communication distance and higher communication success rate, the requirement on the anti-attenuation capability of a receiver is higher and higher.
Disclosure of Invention
In order to overcome the technical problems in the prior art, the present disclosure provides a power line carrier communication receiver and a control method thereof, so as to improve the anti-attenuation capability of the receiver.
According to an aspect of the present disclosure, there is provided a power line carrier communication receiver including a first variable gain amplifier, a second variable gain amplifier, a third variable gain amplifier, an analog-to-digital converter, and an automatic gain control unit, which are sequentially cascaded;
the automatic gain control unit is respectively connected with the output end of the analog-to-digital converter, the control end of the first variable gain amplifier, the control end of the second variable gain amplifier and the control end of the third variable gain amplifier in a communication way, and is used for controlling the first variable gain amplifier, the second variable gain amplifier and the third variable gain amplifier according to digital signals output by the analog-to-digital converter.
Optionally, the power line carrier communication receiver further includes an adjustable band-pass filter, and the second variable gain amplifier and the adjustable band-pass filter are integrally arranged;
and the automatic gain control unit is connected with the control end of the adjustable band-pass filter and is used for controlling the adjustable band-pass filter.
Optionally, the analog-to-digital converter is a sigma delta converter, and the tunable band-pass filter is a fourth-order RC active band-pass filter.
Optionally, the first variable gain amplifier is a programmable gain low noise amplifier, the second variable gain amplifier is a programmable gain amplifier, and the third variable gain amplifier is a programmable gain amplifier.
Optionally, the adjustment step size of the first variable gain amplifier is the same as the adjustment step size of the second variable gain amplifier, and the gain step size of the first variable gain amplifier is greater than the gain step size of the second variable gain amplifier;
the adjustment step size of the second variable gain amplifier is larger than that of the third variable gain amplifier, and the gain gear of the second variable gain amplifier is smaller than that of the third variable gain amplifier.
Optionally, the first variable gain amplifier includes an operational amplifier, a first capacitor array, a second capacitor array, a third capacitor array, and a fourth capacitor array;
a first input end of the operational amplifier is respectively connected with one end of the first capacitor array and one end of the third capacitor array, the other end of the first capacitor array is used for inputting signals, and the other end of the third capacitor array is connected with a first output end of the operational amplifier;
a second input end of the operational amplifier is respectively connected with one end of the second capacitor array and one end of the fourth capacitor array, the other end of the second capacitor array is used for inputting signals, and the other end of the fourth capacitor array is connected with a second output end of the operational amplifier;
the first capacitor array and the second capacitor array have the same parameters, and are symmetrical in position;
the third capacitor array and the fourth capacitor array have the same parameters, and are symmetrical in position.
Optionally, the automatic gain control unit includes a baseband processing unit, and the baseband processing unit is connected to the output end of the analog-to-digital converter in a communication manner.
According to another aspect of the present disclosure, there is provided a control method for a power line carrier communication receiver, where the method is used for the power line carrier communication receiver in any one of the embodiments of the present disclosure, and the method includes:
the automatic gain control unit acquires a digital signal output by the analog-to-digital converter, and estimates the amplitude of a power line carrier signal received by the power line carrier communication receiver according to the digital signal;
configuring the first variable gain amplifier, the second variable gain amplifier and the third variable gain amplifier according to the amplitude of the power line carrier signal.
Optionally, the configuring the first variable gain amplifier, the second variable gain amplifier, and the third variable gain amplifier according to the amplitude of the power line carrier signal includes:
determining the amplitude difference between the amplitude of the power line carrier signal and a preset signal amplitude expected value;
reading a pre-stored current gain adjustable range of the first variable gain amplifier, a pre-stored current gain adjustable range of the second variable gain amplifier and a pre-stored current gain adjustable range of the third variable gain amplifier;
determining gain adjustment amounts of the first variable gain amplifier, the second variable gain amplifier and the third variable gain amplifier according to the current gain adjustable range of the first variable gain amplifier, the current gain adjustable range of the second variable gain amplifier, the current gain adjustable range of the third variable gain amplifier and the amplitude difference;
and sending a gain gear adjustment control instruction to the corresponding first variable gain amplifier, the second variable gain amplifier and/or the third variable gain amplifier according to the gain adjustment amount, and updating the current gain adjustable range of the first variable gain amplifier, the current gain adjustable range of the second variable gain amplifier and the current gain adjustable range of the third variable gain amplifier according to the gain adjustment amount.
Optionally, the adjustment step size of the first variable gain amplifier and the adjustment step size of the second variable gain amplifier are both equal to the gain adjustable amplitude of the third variable gain amplifier;
the determining the gain adjustment amounts of the first variable gain amplifier, the second variable gain amplifier and the third variable gain amplifier according to the current gain adjustable range of the first variable gain amplifier, the current gain adjustable range of the second variable gain amplifier, the current gain adjustable range of the third variable gain amplifier and the amplitude difference comprises:
judging whether the amplitude difference exceeds the current gain adjustable range of the third variable gain amplifier;
if the amplitude difference does not exceed the current gain adjustable range of the third variable gain amplifier, taking the amplitude difference as the gain adjustment amount of the third variable gain amplifier;
and if the amplitude difference exceeds the current gain adjustable range of the third variable gain amplifier, determining the gain adjustment amount of the first variable gain amplifier, the second variable gain amplifier and the third variable gain amplifier according to the amplitude difference and the adjustment step length of the second variable gain amplifier.
According to one or more technical schemes provided in the embodiments of the present application, the power line carrier communication receiver increases the overall gain adjustment range by cascading three stages of amplifiers, and controls the first variable gain amplifier, the second variable gain amplifier and the third variable gain amplifier according to the digital signal output by the analog-to-digital converter in cooperation with the automatic gain control unit, so as to adjust the gain, so that the output of the third variable gain amplifier is stabilized within a reasonable range, and the anti-attenuation capability of the receiver is improved.
Drawings
Further details, features and advantages of the disclosure are disclosed in the following description of exemplary embodiments, taken in conjunction with the accompanying drawings, in which:
fig. 1 shows a schematic block diagram of a power line carrier communication receiver according to an exemplary embodiment of the present disclosure;
fig. 2 shows a schematic block diagram of a first variable gain amplifier according to an exemplary embodiment of the present disclosure;
fig. 3 shows a flowchart of a control method of a power line carrier communication receiver according to an exemplary embodiment of the present disclosure;
fig. 4 shows another flowchart of a control method of a power line carrier communication receiver according to an exemplary embodiment of the present disclosure.
Detailed Description
Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present disclosure are shown in the drawings, it is to be understood that the present disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided for a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the disclosure are for illustration purposes only and are not intended to limit the scope of the disclosure.
It should be understood that the various steps recited in the method embodiments of the present disclosure may be performed in a different order, and/or performed in parallel. Moreover, method embodiments may include additional steps and/or omit performing the illustrated steps. The scope of the present disclosure is not limited in this respect.
The term "include" and variations thereof as used herein are open-ended, i.e., "including but not limited to". The term "based on" is "based, at least in part, on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Relevant definitions for other terms will be given in the following description. It should be noted that the terms "first", "second", and the like in the present disclosure are only used for distinguishing different devices, modules or units, and are not used for limiting the order or interdependence relationship of the functions performed by the devices, modules or units.
It is noted that references to "a", "an", and "the" modifications in this disclosure are intended to be illustrative rather than limiting, and that those skilled in the art will recognize that "one or more" may be used unless the context clearly dictates otherwise.
The names of messages or information exchanged between devices in the embodiments of the present disclosure are for illustrative purposes only, and are not intended to limit the scope of the messages or information.
Aspects of the present disclosure are described below with reference to the accompanying drawings.
Referring to fig. 1, a power line carrier communication receiver includes a first variable gain amplifier 101, a second variable gain amplifier 102, a third variable gain amplifier 103, an analog-to-digital converter 104, and an automatic gain control unit 105, which are sequentially cascaded;
the automatic gain control unit 105 is respectively connected to the output end of the analog-to-digital converter 104, the control end of the first variable gain amplifier 101, the control end of the second variable gain amplifier 102, and the control end of the third variable gain amplifier 103 in communication, and is configured to control the first variable gain amplifier 101, the second variable gain amplifier 102, and the third variable gain amplifier 103 according to the digital signal output by the analog-to-digital converter 104.
In the power line carrier communication receiver in the embodiment of the present disclosure, the three stages of amplifiers are cascaded to increase the overall gain adjustment range, and the automatic gain control unit is used to control the first variable gain amplifier 101, the second variable gain amplifier 102, and the third variable gain amplifier 103 according to the digital signal output by the analog-to-digital converter 104, so as to adjust the gain, so that the output of the third variable gain amplifier is stabilized within a reasonable range. Wherein the gain adjustment step size of the third variable gain amplifier 103 may be smaller than the gain adjustment step sizes of the first variable gain amplifier 101 and the second variable gain amplifier 102. The power line carrier communication receiver can realize gain adjustment with different precisions.
Illustratively, the first variable gain amplifier 101 is a programmable gain low noise amplifier, the second variable gain amplifier 102 is a programmable gain amplifier (LNA), and the third variable gain amplifier 103 is a Programmable Gain Amplifier (PGA).
When the first variable gain amplifier is a programmable gain low noise amplifier, due to the low noise coefficient, the first variable gain amplifier can provide proper gain for the whole power line carrier communication receiver and simultaneously has the protection function, and can ensure that the power line carrier communication receiver has an extremely low system noise coefficient.
The second variable gain amplifier and the third variable gain amplifier can adopt the existing programmable gain amplifier, which comprises a fully balanced differential amplifier module, a decoder module and a resistance switch array module, wherein the resistance ratio of a negative feedback resistance voltage divider in the fully balanced differential amplifier module determines the maximum gain of the amplifier, and the attenuation quantity of the attenuation input signal of the resistance switch array module is controlled through the decoding result of the decoder module, so that the gain of the amplifier can be programmed finally.
Exemplarily, referring to fig. 2, the first variable gain amplifier includes an operational amplifier 201, a first capacitor array C1, a second capacitor array C2, a third capacitor array C3, and a fourth capacitor array C4;
a first input end of the operational amplifier is respectively connected with one end of a first capacitor array C1 and one end of a third capacitor array C3, the other end of the first capacitor array C1 is used for inputting signals, and the other end of the third capacitor array C3 is connected with a first output end of the operational amplifier;
a second input end of the operational amplifier is respectively connected with one end of a second capacitor array C2 and one end of a fourth capacitor array C4, the other end of the second capacitor array C2 is used for inputting signals, and the other end of the fourth capacitor array C4 is connected with a second output end of the operational amplifier;
the first capacitor array C1 and the second capacitor array C2 have the same parameters, and the first capacitor array C1 and the second capacitor array C2 are symmetrical in position;
the third capacitor array C3 has the same parameters as the fourth capacitor array C4, and the third capacitor array C3 is symmetrical to the fourth capacitor array C4.
The amplifier is characterized in that signals are amplified by adopting a capacitance proportion, and compared with the traditional resistance proportion amplifying circuit structure, the amplifier can greatly reduce equivalent noise of an input end by adopting the capacitance proportion amplification and reduce the noise coefficient. Here, the first variable gain amplifier may select an appropriate gain step by 4-bit decoding, and the capacitor array is a variable capacitor.
For example, referring to fig. 1, the adjustment step size of the first variable gain amplifier 101 is the same as the adjustment step size of the second variable gain amplifier 102, and the gain step size of the first variable gain amplifier 101 is greater than that of the second variable gain amplifier 102;
the adjustment step size of the second variable gain amplifier 102 is larger than that of the third variable gain amplifier 103, and the gain step size of the second variable gain amplifier 102 is smaller than that of the third variable gain amplifier 103.
Illustratively, the first variable gain amplifier is designed as a programmable gain low noise amplifier, the noise coefficient does not exceed 4dB at the maximum gain, the gain is adjustable between-12 dB and 36dB, the step length is adjusted to 6dB, and 9 gain steps are provided. The gain of the second variable gain amplifier is adjustable between 0dB and 18dB, the gain adjustment step length is 6dB, and 4 gain gears are total. The gain of the third variable gain amplifier is adjustable between 0dB and 6dB, the step length is adjusted to 1dB, and the gain is in 7 gain gears. Through the cascade connection of the three stages of amplifiers, the gain change of-12 dB to 60dB can be realized, the dynamic range reaches 74dB, the amplification and receiving requirements on weak signals in power line carrier communication are fully met, and the anti-attenuation performance of the system is improved.
Illustratively, the analog-to-digital converter is a Σ Δ converter, and the power consumption of the Σ Δ converter can be reduced compared to analog-to-digital converters of other architectures. The method is beneficial to the low-power-consumption design of the system, greatly improves the signal-to-noise ratio through high sampling rate and shapes the noise, and ensures the effective bit width of the output.
In an alternative implementation, referring to fig. 1, further comprising a tunable bandpass filter 106, the second variable gain amplifier 102 is integrated with the tunable bandpass filter 106, and the automatic gain control unit 105 is connected to a control terminal of the tunable bandpass filter 106 for controlling the tunable bandpass filter. When the programmable gain low noise amplifier is used, the cascade mode of the adjustable band-pass filter behind the low noise amplifier can greatly reduce the noise coefficient of the system and improve the anti-attenuation performance.
Illustratively, the tunable bandpass filter is a tunable bandwidth bandpass filter (PBPL), and optionally, the tunable bandpass filter is a fourth-order RC active bandpass filter, where RC is a resistor-capacitor. The out-of-band rejection capability of the fourth-order RC active band-pass filter is 24 dB/octave, and the fourth-order RC active band-pass filter and the second variable gain amplifier are integrally designed. The passband of the adjustable band-pass filter is adjustable between 0.2MHz and 13.2MHz, and the adjustment step length of the upper cutoff frequency and the lower cutoff frequency of the passband is 1 MHz. The passband of the tunable bandpass filter is adjusted to effectively cover the communication requirements of all frequency bands at present.
In one embodiment, the automatic gain control unit 105 comprises a baseband processing unit communicatively coupled to an output of the analog-to-digital converter 104. The baseband calculates a reasonable gain value according to the amplitude of the signal output by the analog-to-digital converter, and then feeds back the gain value to the programmable gain amplifier through a gain adjustment strategy, so that the output of the programmable gain amplifier is in an amplitude interval with good linearity of the digital-to-analog converter
Referring to fig. 3, a control method of a power line carrier communication receiver, for the power line carrier communication receiver in the embodiments of the present disclosure, includes:
s301, the automatic gain control unit acquires a digital signal output by the analog-to-digital converter, and estimates the amplitude of a power line carrier signal received by the power line carrier communication receiver according to the digital signal;
and S302, configuring a first variable gain amplifier, a second variable gain amplifier and a third variable gain amplifier according to the amplitude of the power line carrier signal.
In one embodiment, referring to fig. 4, configuring a first variable gain amplifier, a second variable gain amplifier, and a third variable gain amplifier according to an amplitude of a power line carrier signal includes:
s401, determining the amplitude difference between the amplitude of the power line carrier signal and a preset signal amplitude expected value;
in S401, the expected signal amplitude value may be set as needed, and is not limited in this embodiment.
S402, reading the pre-stored current gain adjustable range of the first variable gain amplifier, the current gain adjustable range of the second variable gain amplifier and the current gain adjustable range of the third variable gain amplifier;
in S402, the pre-stored current gain adjustable range of the first variable gain amplifier, the pre-stored current gain adjustable range of the second variable gain amplifier, and the pre-stored current gain adjustable range of the third variable gain amplifier are initialized according to the parameters of the first variable gain amplifier, the second variable gain amplifier, and the third variable gain amplifier. For example, the gain of the second variable gain amplifier is 0dB to 18dB, and the current gain adjustable range of the second variable gain amplifier is 0dB to 18 dB.
S403, determining gain adjustment amounts of the first variable gain amplifier, the second variable gain amplifier and the third variable gain amplifier according to the current gain adjustable range of the first variable gain amplifier, the current gain adjustable range of the second variable gain amplifier, the current gain adjustable range of the third variable gain amplifier and the amplitude difference;
s404, sending a gain gear adjustment control instruction to the corresponding first variable gain amplifier, second variable gain amplifier and/or third variable gain amplifier according to the gain adjustment amount, and updating the current gain adjustable range of the first variable gain amplifier, the current gain adjustable range of the second variable gain amplifier and the current gain adjustable range of the third variable gain amplifier according to the gain adjustment amount.
In S404, when the current gain adjustable range of the first variable gain amplifier, the current gain adjustable range of the second variable gain amplifier, and the current gain adjustable range of the third variable gain amplifier are updated according to the gain adjustment amount, for example, when the current gain adjustable range of the second variable gain amplifier is 0dB to 18dB, and the gain adjustment amount of the second variable gain amplifier is 6dB, the current gain adjustable range of the second variable gain amplifier is [ (0dB-6dB) to (18 dB-6dB) ].
The technical scheme of the embodiment can automatically adjust the current gain adjustable range of the first variable gain amplifier, the current gain adjustable range of the second variable gain amplifier and the current gain adjustable range of the third variable gain amplifier, and determine the gain adjustment amount of the first variable gain amplifier, the second variable gain amplifier and the third variable gain amplifier based on the current gain adjustable range of the first variable gain amplifier, the current gain adjustable range of the second variable gain amplifier and the current gain adjustable range of the third variable gain amplifier, thereby simplifying the calculation steps and improving the calculation efficiency.
Illustratively, the adjustment step size of the first variable gain amplifier and the adjustment step size of the second variable gain amplifier are both equal to the gain adjustable amplitude of the third variable gain amplifier;
determining the gain adjustment amounts of the first variable gain amplifier, the second variable gain amplifier and the third variable gain amplifier according to the current gain adjustable range of the first variable gain amplifier, the current gain adjustable range of the second variable gain amplifier, the current gain adjustable range of the third variable gain amplifier and the amplitude difference comprises:
judging whether the amplitude difference exceeds the current gain adjustable range of the third variable gain amplifier;
if the amplitude difference does not exceed the current gain adjustable range of the third variable gain amplifier, taking the amplitude difference as the gain adjustment quantity of the third variable gain amplifier; it can be known that, at this time, the gain adjustment amount of the first variable gain amplifier and the gain adjustment amount of the second variable gain amplifier are 0.
And if the amplitude difference exceeds the current gain adjustable range of the third variable gain amplifier, determining the gain adjustment amount of the first variable gain amplifier, the second variable gain amplifier and the third variable gain amplifier according to the amplitude difference and the adjustment step length of the second variable gain amplifier. The adjustment step length of the first variable gain amplifier and the adjustment step length of the second variable gain amplifier are both 6dB, the adjustment step length of the third variable gain amplifier is 1dB, and the gain adjustable amplitude of the third variable gain amplifier is 6 dB. The total gain of the first variable gain amplifier and the second variable gain amplifier can be determined to be adjusted according to the amplitude difference, wherein the amplitude remainder can be obtained by subtracting the amplitude remainder from the amplitude difference, and the amplitude remainder is the remainder obtained by dividing the amplitude difference by the adjustment step size of the second variable gain amplifier. And determining the gain adjustment amount of the first variable gain amplifier by using the remainder, and determining the gain adjustment amounts of the first variable gain amplifier and the second variable gain amplifier according to the total gain, the current gain adjustable range of the first variable gain amplifier and the current gain adjustable range of the second variable gain amplifier. Specifically, according to the priorities of the first variable gain amplifier and the second variable gain amplifier, taking the priority of the first variable gain amplifier as an example, which is greater than the priority of the second variable gain amplifier, according to the total gain and the current gain adjustable range of the first variable gain amplifier, when the total gain is within the current gain adjustable range of the first variable gain amplifier, the total gain is used as the gain adjustment amount of the first variable gain amplifier. And when the total gain exceeds the current gain adjustable range of the first variable gain amplifier, taking the upper limit of the current gain adjustable range as the gain adjustment amount of the first variable gain amplifier, and taking the difference value of the total gain and the upper limit of the current gain adjustable range as the gain adjustment amount of the second variable gain amplifier. By adopting the technical scheme of the embodiment, the corresponding calculation efficiency can be further improved.
According to the technical scheme of the embodiment, different gain adjustment amount calculation modes can be adopted according to the relation between the amplitude difference and the current gain adjustable range of the third variable gain amplifier, so that the calculation amount is reduced, and the efficiency is improved.
Claims (10)
1. A power line carrier communication receiver is characterized by comprising a first variable gain amplifier, a second variable gain amplifier, a third variable gain amplifier, an analog-to-digital converter and an automatic gain control unit which are sequentially cascaded;
the automatic gain control unit is respectively connected with the output end of the analog-to-digital converter, the control end of the first variable gain amplifier, the control end of the second variable gain amplifier and the control end of the third variable gain amplifier in a communication way, and is used for controlling the first variable gain amplifier, the second variable gain amplifier and the third variable gain amplifier according to digital signals output by the analog-to-digital converter.
2. The power-line carrier communication receiver according to claim 1, wherein the power-line carrier communication receiver further comprises a tunable bandpass filter, and the second variable gain amplifier is provided integrally with the tunable bandpass filter;
and the automatic gain control unit is connected with the control end of the adjustable band-pass filter and is used for controlling the adjustable band-pass filter.
3. The power-line carrier communication receiver of claim 2, wherein the analog-to-digital converter is a sigma delta converter and the tunable band-pass filter is a fourth-order RC active band-pass filter.
4. The power-line carrier communication receiver according to claim 1, wherein the first variable gain amplifier is a programmable gain low noise amplifier, the second variable gain amplifier is a programmable gain amplifier, and the third variable gain amplifier is a programmable gain amplifier.
5. The power-line carrier communication receiver according to claim 1, wherein an adjustment step size of the first variable gain amplifier is the same as an adjustment step size of the second variable gain amplifier, and a gain step size of the first variable gain amplifier is larger than a gain step size of the second variable gain amplifier;
the adjustment step size of the second variable gain amplifier is larger than that of the third variable gain amplifier, and the gain gear of the second variable gain amplifier is smaller than that of the third variable gain amplifier.
6. The power line carrier communication receiver according to any one of claims 1 to 5, wherein the first variable gain amplifier comprises an operational amplifier, a first capacitor array, a second capacitor array, a third capacitor array and a fourth capacitor array;
a first input end of the operational amplifier is respectively connected with one end of the first capacitor array and one end of the third capacitor array, the other end of the first capacitor array is used for inputting signals, and the other end of the third capacitor array is connected with a first output end of the operational amplifier;
a second input end of the operational amplifier is respectively connected with one end of the second capacitor array and one end of the fourth capacitor array, the other end of the second capacitor array is used for inputting signals, and the other end of the fourth capacitor array is connected with a second output end of the operational amplifier;
the first capacitor array and the second capacitor array have the same parameters, and are symmetrical in position;
the third capacitor array and the fourth capacitor array have the same parameters, and are symmetrical in position.
7. The power-line carrier communication receiver of claim 1, wherein the automatic gain control unit comprises a baseband processing unit, the baseband processing unit being communicatively coupled to an output of the analog-to-digital converter.
8. A control method for a power line carrier communication receiver according to any one of claims 1 to 7, the method comprising:
the automatic gain control unit acquires a digital signal output by the analog-to-digital converter, and estimates the amplitude of a power line carrier signal received by the power line carrier communication receiver according to the digital signal;
configuring the first variable gain amplifier, the second variable gain amplifier and the third variable gain amplifier according to the amplitude of the power line carrier signal.
9. The method according to claim 8, wherein the configuring the first variable gain amplifier, the second variable gain amplifier and the third variable gain amplifier according to the amplitude of the power line carrier signal includes:
determining the amplitude difference between the amplitude of the power line carrier signal and a preset signal amplitude expected value;
reading a pre-stored current gain adjustable range of the first variable gain amplifier, a pre-stored current gain adjustable range of the second variable gain amplifier and a pre-stored current gain adjustable range of the third variable gain amplifier;
determining gain adjustment amounts of the first variable gain amplifier, the second variable gain amplifier and the third variable gain amplifier according to the current gain adjustable range of the first variable gain amplifier, the current gain adjustable range of the second variable gain amplifier, the current gain adjustable range of the third variable gain amplifier and the amplitude difference;
and sending a gain gear adjustment control instruction to the corresponding first variable gain amplifier, the second variable gain amplifier and/or the third variable gain amplifier according to the gain adjustment amount, and updating the current gain adjustable range of the first variable gain amplifier, the current gain adjustable range of the second variable gain amplifier and the current gain adjustable range of the third variable gain amplifier according to the gain adjustment amount.
10. The method according to claim 9, wherein the step size of the first variable gain amplifier and the step size of the second variable gain amplifier are both equal to the gain adjustable amplitude of a third variable gain amplifier;
the determining the gain adjustment amounts of the first variable gain amplifier, the second variable gain amplifier and the third variable gain amplifier according to the current gain adjustable range of the first variable gain amplifier, the current gain adjustable range of the second variable gain amplifier, the current gain adjustable range of the third variable gain amplifier and the amplitude difference comprises:
judging whether the amplitude difference exceeds the current gain adjustable range of the third variable gain amplifier;
if the amplitude difference does not exceed the current gain adjustable range of the third variable gain amplifier, taking the amplitude difference as the gain adjustment amount of the third variable gain amplifier;
and if the amplitude difference exceeds the current gain adjustable range of the third variable gain amplifier, determining the gain adjustment amount of the first variable gain amplifier, the second variable gain amplifier and the third variable gain amplifier according to the amplitude difference and the adjustment step length of the second variable gain amplifier.
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