Sampling circuit and method

Abstract

The invention discloses a sampling circuit and method. The sampling circuit comprises a first multiplier, a second multiplier, a memory, a filter and an ADC analog-to-digital converter, wherein the first multiplier is used for performing frequency mixing processing on an input signal to obtain a first signal, and sending the first signal to the memory; the memory is used for storing the first signal and sending the first signal to the second multiplier; the second multiplier is used for performing frequency spectrum shifting on the first signal to obtain a second signal, and sending the secondsignal to the filter; the filter is used for performing filtering processing on the second signal to obtain the third signal, and sending the third signal to the ADC; and the ADC is used for performing analog-to-digital conversion on the third signal to obtain a sampling sequence. The sampling circuit disclosed by the invention avoids the hardware cost problem caused by the increasing of the sub-band amount, the sampling can be realized without using multiple channels, and the flexibility of the sampling is improved.

Description

technical field [0001] The invention relates to the field of circuits, in particular to a sampling circuit and method. Background technique [0002] The existing sampling circuit is composed of multiple channels, and each channel is composed of a mixer, a low-pass filter and an ADC. When the number of subbands contained in the signal is small, the hardware implementation cost of the sampling circuit is low and the signal sampling task can be well completed. When the number of subbands contained in the input signal is large, many problems will arise. First, it will lead to an increase in hardware cost; second, hardware circuit design needs to consider heat dissipation, electromagnetic compatibility and other issues more comprehensively, which increases the difficulty of circuit design; in addition, the structural flexibility of traditional multi-channel sampling circuits is very poor. When the number of sub-bands contained in the signal increases or decreases, the number of ...

AI Technical Summary

Problems solved by technology

First, it will lead to an increase in hardware cost; second, hardware circuit design needs to consider heat dissipation, electromagnetic compatibility and other issues more comprehensively, which increases the difficulty of circuit design; in addition, the structural flexibility of traditional multi-channel sampling circuits is very poor. When the number of sub-bands contained in the signal increases or decreases, the number of sampling channels needs to be increased or decreased accordingly, thus reducing the applicable scenarios and scope of the sampling circuit

[0003] For the above problems, no effective solution has been proposed

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