Signal sampling circuit and method

Abstract

The invention relates to a signal sampling circuit and method. The signal sampling circuit comprises a pre-sampling module, a sampling control module and a data sampling module. The pre-sampling module is configured to sample a sampled signal and output a pre-sampled signal in response to a first sampling effective signal. The sampling control module is configured to generate a synthetic clock according to a sampling clock, and sample a first sampling effective signal in response to the synthetic clock to obtain a second sampling effective signal; and outputting a sampling control signal according to the second sampling effective signal, the synthetic clock and the sampling clock. The data sampling module is connected with the pre-sampling module and the sampling control module, and is configured to respond to a sampling clock and a sampling control signal, sample a pre-sampling signal and output a sampling signal. According to the signal sampling circuit, sampling errors of the sampling circuit can be avoided when the frequency of the sampling clock is just two times of the frequency of the sampled signal.

Description

technical field [0001] The present invention relates to the technical field of electronic circuits, in particular to a signal sampling circuit and method. Background technique [0002] When sampling the sampled signal by using the sampling circuit, the frequency of the sampling clock is usually required to be twice or more than the frequency of the sampled signal. Also, if the frequency of the sampling clock is exactly twice the frequency of the sampled signal, the sampling clock is required to be slightly out of phase with the sampled signal. [0003] However, when the sampled signal is output by an analog circuit in the chip or other circuits outside the chip, it is difficult to accurately determine the phase relationship between the sampling clock and the sampled signal. Based on this, when the sampled signal is sampled according to the sampling clock, the sampled signal may just be in a changing state, resulting in a problem of sampling errors. [0004] Therefore, how ...

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Problems solved by technology

[0005] Based on this, it is necessary to provide a signal sampling circuit and method for how to avoid the problem of sampling errors in the sampling circuit when the frequency of the sampling clock is exactly twice the frequency of the signal to be sampled

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