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Method and device for increasing A/D converter signal noise ratio

A converter and signal-to-noise ratio technology, applied in the field of improving the signal-to-noise ratio of A/D converters, can solve problems such as system noise, achieve the best signal-to-noise ratio and avoid additional noise.

Inactive Publication Date: 2006-03-08
VIMICRO CORP
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Problems solved by technology

[0008] However, this method also has disadvantages: since the voltage value amplified by the PGA is constantly compared with the set voltage value and the gain of the PGA is adjusted, it always takes a certain amount of time for the adjusted PGA gain to stabilize, so that will introduce additional noise to the system

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  • Method and device for increasing A/D converter signal noise ratio
  • Method and device for increasing A/D converter signal noise ratio
  • Method and device for increasing A/D converter signal noise ratio

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Embodiment Construction

[0043] The method and device for improving the signal-to-noise ratio of the A / D converter disclosed in the present invention, its core idea is to compare the power of the output signal of the A / D converter with the target signal power corresponding to the predetermined signal-to-noise ratio, and according to the comparison As a result, the gain of the PGA connected before the A / D converter is adjusted so that the analog signal input to the A / D converter is best matched with the A / D converter, thereby obtaining the best signal-to-noise ratio.

[0044] figure 2 It is the functional block diagram of the device of the present invention, including:

[0045] PGA, used to amplify the input analog signal with a certain gain;

[0046] The A / D converter is used to perform analog-to-digital conversion on the signal amplified by the PGA;

[0047] An output power calculation module for calculating the power of the digital signal output by the A / D converter;

[0048] A power comparison ...

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Abstract

The method includes following steps: through programmable gain amplifier, input analog signals are magnified; through A / D converter, amplified analog signal is converted to digital signal outputted; calculating power of digital signal from a certain amount of output data; comparing power of digital signal with power value of target setup in advance; based on result obtained from comparing powers, gain of programmable gain amplifier is adjusted. The invention also discloses device for raising SNR of A / D converter. The device includes PGA, A / D converter, module for calculating output power, power comparison module, and PGA gain control module. The method can reach optimal match between input signal and A / D converter, and raises SNR of A / D converter evidently. The method and device are applicable to circuit of containing A / D converter.

Description

technical field [0001] The invention relates to the field of circuit noise reduction design, in particular to a method and device for improving the signal-to-noise ratio of an A / D converter. technical background [0002] For A / D converters, quantization errors always exist. If the quantization error is regarded as a kind of additive noise, a (B+1) bit A / D converter, the ratio of its signal to additive quantization noise can be expressed in dB (decibel): [0003] SNR = 6.02 B + 10.8 - 10 × log 10 ( X m P x ) ( dB ) . [0004] where X m is the full-scale value of the A / D converter, P x is the power of the input signal. [0005] The methods f...

Claims

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Application Information

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IPC IPC(8): H03M1/08H03M1/12
Inventor 温小勇冯宇红
Owner VIMICRO CORP
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