Nanosecond digital programmable delay circuit based on FPGA (Field-Programmable Gate Array)

Abstract

The invention discloses a nanosecond digital programmable delay circuit based on an FPGA (Field-Programmable Gate Array). The delay circuit is composed of a programmable transverse selector and a longitudinal delay unit capable of realizing different delay time. The transverse selector is formed by a plurality of either-or selectors in cascade connection; the longitudinal delay unit is formed by different numbers of basic delay units in cascade connection; the transverse selector realizes programmable delay through controlling input signals to pass through the longitudinal delay unit or not, and realizes precise and controllable delay by a locating and wiring restriction technology. The nanosecond digital programmable delay circuit disclosed by the invention can realize precise nanosecond delay by the programming and by the FPGA design, the precision is high, the versatility and the applicability are strong.

Description

technical field [0001] The invention belongs to a delay circuit, in particular to a nanosecond-level digital programmable delay circuit based on FPGA. Background technique [0002] Because the delay circuit can delay the input signal, it is widely used in clock phase modulation, parallel signal timing calibration and target echo simulation. The delay circuit can adjust the phase of the clock, so that the clock signal and the sampled signal meet the sampling phase relationship, and can also adjust the parallel signal to calibrate the phase deviation in the parallel signal transmission process. In the target echo simulator, the delay circuit can be applied to simulate the continuous echo of moving targets. [0003] The current delay circuit is mainly divided into analog delay circuit and digital delay circuit. The analog delay circuit has the disadvantages of large delay time scale, fixed delay time and poor delay accuracy due to the use of analog devices to generate delay. ...

AI Technical Summary

Problems solved by technology

[0003] The current delay circuit is mainly divided into analog delay circuit and digital delay circuit. The analog delay circuit has the disadvantages of large delay time scale, fixed delay time and poor delay accuracy due to the use of analog devices to generate delay. limit its application

The digital delay circuit has the advantages of high delay precision and programmable time, but it can only be realized by a dedicated chip at present. However, the dedicated programmable delay chip is generally more expensive and has more pins, which brings great difficulties to the circuit design. great inconvenience

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