Pulse signal unilateral edge time delay circuit

Abstract

The invention discloses a pulse signal unilateral edge time delay circuit which comprises a first-level phase inverter U82, a second-level phase inverter U83, two pairs of transistor switches, a constant flow source I0, a capacitor C80, a fifth switch MP80, a voltage comparator U80 and a nor-logic element U81; at the input pulse low electric level stage, the constant flow source I0 charges for the capacitor C80 through controlled transistors; after input pulse rising edge comes, electric charge stored by the capacitor C80 through a discharge switch by utilizing the constant flow source I0 is subjected to linear discharge; and the voltage comparator U80 detects the voltage of the capacitor C80 and obtains unilateral time delay pulse signal together with the input signal reverse signal through the nor-logic element U81. The circuit provided by the invention achieves unilateral edge time delay, and has the advantages of long time delay per capacitor, flexible time delay regulation and good digital signal completeness.

Description

technical field [0001] The invention relates to an edge delay circuit of a pulse signal, in particular to a circuit which uses a constant current source to discharge a charging capacitor to realize pulse single-side edge delay. Background technique [0002] The pulse delay circuit is a functional circuit that can extend the rising edge and / or falling edge of the pulse signal for a certain period of time before outputting. figure 1 shows the input and output pulse waveforms of typical pulse one-sided delays, as figure 1 As shown, the output pulse on the right side of the "pulse edge delay circuit" is compared with the input pulse on the left side, and the rising edge of the pulse is delayed to a certain moment before it appears. figure 1 The signal waveform on the right shows that the output pulse has a one-sided delay characteristic, or rising edge delay, relative to the input pulse. [0003] In the more general case, figure 2 The input and output pulse waveforms of comm...

AI Technical Summary

Problems solved by technology

Compared with resistors and capacitors, the constant current source circuit can suppress the influence of circuit temperature characteristics and power supply voltage on the edge delay, but the current constant current source pulse delay technology has poor digital signal integrity, and the rising and falling edges of the input pulse are both sides Latency Disadvantages

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