An amplifier and its realization method

Abstract

The invention relates to an amplifier and a realization method thereof. The amplifier comprises a master amplifier, a level comparer, a differential amplifier, a first detector, a second detector and a first-order lowpass filter. The method comprises the steps of representing a frequency of input signals through power difference before and after the input signals pass the first-order lowpass filter; converting the power difference into a voltage with certain function relation by the detectors, amplifying differential voltage signals by the differential amplifier and converting the differential voltage signals into a single-end voltage; and carrying out frequency selection on output of the differential amplifier and the output of DAC by the level comparer, thereby obtaining a bias voltage of the master amplifier. The amplifier and the method have the beneficial effects that 1, a frequency selection function with the relatively high frequency can be realized through operation carried out on a direct current level; and 2, the circuit configuration is flexible and a frequency selection characteristic can be flexibly configured according to a demand.

Description

technical field

[0001] The invention relates to the field of signal processing, in particular to an amplifier and its realization method. Background technique

[0002] Frequency and amplitude are two extremely important parameters in the circuit. Amplifiers are widely used in amplitude conversion, and frequency selection is usually done using filters.

[0003] In existing circuits, amplifiers and filters are usually two separate modules, which are responsible for amplitude and frequency control respectively.

[0004] Usually, once the frequency response of the filter is determined, the resistance, capacitance, inductance or their equivalent circuits that make up the filter are determined. In order to achieve different filtering characteristics, it is necessary to choose a more costly program-controlled filter, or re-select the filter, Lead to an increase in design and system costs. Contents of the invention

[0005] In order to solve the above-mentioned problems in the p...

Examples

Embodiment 1

[0026] Such as figure 1 As shown, this embodiment provides an amplifier, including a main amplifier 101, a level comparator 106, a differential amplifier a, a first detector 102, a second detector 105 and a first-order low-pass filter b. Wherein, one end of the first-order low-pass filter b and the second wave detector 105 are respectively connected to the signal input end, and the other end of the first-order low-pass filter b is connected to the first wave detector 102; the first wave detector 102, the second wave detector The output terminals of 105 are respectively connected to the two input terminals of differential amplifier a; the output terminal of differential amplifier a is connected to the inverting input terminal of level comparator 104; the non-inverting input terminal of level comparator 104 is connected to the output terminal of DAC, and the level comparison The output terminal of the device 104 is connected to the main amplifier 101.

[0027] Further, the firs...

Embodiment 2

[0040] Such as figure 2 As shown, this embodiment provides a method for implementing an amplifier, including:

[0041] S1) converting the frequency of the input signal to be processed into a voltage difference;

[0042] S2) amplifying the voltage difference through a differential amplifier, and converting it into a single-ended voltage;

[0043] S3) Frequency-select the single-ended voltage output by the differential amplifier and the output of the DAC through a level comparator to obtain a bias voltage of the main amplifier.

Embodiment 3

[0045] This embodiment serves as a preferred implementation of the above-mentioned method embodiment, wherein S1) converts the frequency of the input signal to be processed into a voltage difference, including:

[0046] S11) characterize the frequency of the input signal to be processed by the power difference before and after passing through the first-order low-pass filter, and divide the input signal into two signals with power difference;

[0047] S12) Converting the two signals with a power difference into two voltage signals with a voltage difference through a detector respectively.

[0048] Preferably, wherein S11) characterizes the frequency of the input signal to be processed by the power difference before and after passing through the first-order low-pass filter, and divides the input signal into two signals with power difference, including: dividing the input signal into two , one of which is filtered by a first-order low-pass filter to obtain an attenuated low-power...

technical field

[0001] The invention relates to the field of signal processing, in particular to an amplifier and its realization method. Background technique

[0002] Frequency and amplitude are two extremely important parameters in the circuit. Amplifiers are widely used in amplitude conversion, and frequency selection is usually done using filters.

[0003] In existing circuits, amplifiers and filters are usually two separate modules, which are responsible for amplitude and frequency control respectively.

[0004] Usually, once the frequency response of the filter is determined, the resistance, capacitance, inductance or their equivalent circuits that make up the filter are determined. In order to achieve different filtering characteristics, it is necessary to choose a more costly program-controlled filter, or re-select the filter, Lead to an increase in design and system costs. Contents of the invention

[0005] In order to solve the above-mentioned problems in the p...

Examples

Embodiment 1

[0026] Such as figure 1 As shown, this embodiment provides an amplifier, including a main amplifier 101, a level comparator 106, a differential amplifier a, a first detector 102, a second detector 105 and a first-order low-pass filter b. Wherein, one end of the first-order low-pass filter b and the second wave detector 105 are respectively connected to the signal input end, and the other end of the first-order low-pass filter b is connected to the first wave detector 102; the first wave detector 102, the second wave detector The output terminals of 105 are respectively connected to the two input terminals of differential amplifier a; the output terminal of differential amplifier a is connected to the inverting input terminal of level comparator 104; the non-inverting input terminal of level comparator 104 is connected to the output terminal of DAC, and the level comparison The output terminal of the device 104 is connected to the main amplifier 101.

[0027] Further, the firs...

Embodiment 2

[0040] Such as figure 2 As shown, this embodiment provides a method for implementing an amplifier, including:

[0041] S1) converting the frequency of the input signal to be processed into a voltage difference;

[0042] S2) amplifying the voltage difference through a differential amplifier, and converting it into a single-ended voltage;

[0043] S3) Frequency-select the single-ended voltage output by the differential amplifier and the output of the DAC through a level comparator to obtain a bias voltage of the main amplifier.

Embodiment 3

[0045] This embodiment serves as a preferred implementation of the above-mentioned method embodiment, wherein S1) converts the frequency of the input signal to be processed into a voltage difference, including:

[0046] S11) characterize the frequency of the input signal to be processed by the power difference before and after passing through the first-order low-pass filter, and divide the input signal into two signals with power difference;

[0047] S12) Converting the two signals with a power difference into two voltage signals with a voltage difference through a detector respectively.

[0048] Preferably, wherein S11) characterizes the frequency of the input signal to be processed by the power difference before and after passing through the first-order low-pass filter, and divides the input signal into two signals with power difference, including: dividing the input signal into two , one of which is filtered by a first-order low-pass filter to obtain an attenuated low-power...

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