Equivalent sampling circuit and equivalent sampling method based on programmable time delay chip

Abstract

The invention relates to the technical field of electrons, and particularly relates to an equivalent sampling circuit based on a programmable time delay chip. The equivalent sampling circuit comprises a signal generation module U1, a time delay module U2 and a sampling gate circuit module U3, which are connected in sequence, and a control module U4 connected with the signal generation module U1 and the time delay module U2 separately. The sampling circuit expands a high speed periodic signal based on the equivalent time sampling principle, a precise time delay stepping system necessary for the equivalent sampling can be established by the programmable time delay chip, a level conversion chip, a high-stability crystal oscillator and a field programmable logic array FPGA, a dynamic adjustment range and a precise time delay function can be simultaneously satisfied, the minimum time delay step length is 10 ps, and the total time delay can be indefinitely long in theory. The technology can be widely applied to a sequential equivalent sampling system.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to an equivalent sampling circuit and a sampling method based on a programmable delay chip. Background technique [0002] For periodic or repeatable signals that appear very short in time or have a high frequency in the frequency domain, a slower sampling frequency is used to take out a sample point on each cycle of the signal or every integer cycle. The sample points recompose a signal, and the shape of the newly composed recurring signal is similar to the shape of the original signal, and the time scale is several times larger than the original signal. By reorganizing these sample points according to a certain rule, the original waveform can be restored, so that a higher equivalent sampling rate can be obtained by using a lower real-time sampling rate. This type of sampling is called equivalent-time sampling (also known as transform sampling). [0003] There are two methods ...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a minimum delay step of 10ps in fine delay, and the total delay theory can be infinitely long based on the sequential equivalent sampling circuit and sampling method of the delay signal, adopting the method of combining thick and fine delays, Combining the characteristics of small delay step size of fine delay and large delay range of coarse delay, it has the characteristics of low cost, simple structure and easy implementation, small delay step size, and unlimited total delay. It can be applied in In the equivalent sampling system, the problem of not being able to conveniently take into account the minimum delay step size and the total delay is solved

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