Pulse generator, pulse generation method and electronic device

Abstract

A pulse generator includes a phase-locked loop, a first pulse width modulator, a second pulse width modulator, a dual-loop delay phase-locked loop, and an integrator, wherein the phase-locked loop isconnected with the first pulse width modulator and the second pulse width modulator, respectively, so that the first pulse width modulator and the second pulse width modulator digitally modulate the positive and negative edges of the output signal of the phase-locked loop, respectively, to realize coarse adjustment of the pulse width. The integrator is connected with the second pulse width modulator for modulating the negative edge of the input signal of the second pulse width modulator to realize fine adjustment of the pulse width, and then the output signal of the pulse width modulator is fed back to the phase-locked loop through the dual-loop delay phase-locked loop to form a closed loop so as to synchronize with the input signal and output the pulse signal. The duty cycle of the pulsesignal has a larger output range and a higher resolution. The present application also discloses a pulse generation method and an electronic device.

Description

technical field [0001] The present application relates to the field of computer communication, in particular to a pulse generator, a pulse generating method and electronic equipment. Background technique [0002] Pulse Width Modulation (Pulse Width Modulation, PWM) is a technology that converts a signal into a pulse. The period of the converted pulse is fixed, but the duty cycle (Duty Cycle) tends to change with the size of the signal. [0003] In the application of high-frequency circuits, it is often necessary to calibrate the duty cycle, especially in a system using double data rate synchronous dynamic random access memory (DDR, double data rate), it is necessary to calibrate the duty cycle of the signal to 50%. In some applications, such as circuit applications for adjusting fan speed, it is also necessary to provide various pulse signals with different duty ratios. [0004] The prior art provides a programmable charge pump circuit to calibrate the duty ratio and provid...

AI Technical Summary

Problems solved by technology

However, the duty cycle of the output pulse of the charge pump circuit is generally about 45% to 60%, the controllable range is not large, and the operable resolution is not high

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