A kind of pulse generator, pulse generating method and electronic equipment

Abstract

The application discloses a pulse generator, including 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 is respectively connected to the first pulse width The modulator is connected with the second pulse width modulator, so that the first pulse width modulator and the second pulse width modulator carry out digital modulation on the positive edge and the negative edge of the output signal of the phase-locked loop respectively, so as to realize the roughness of the pulse width adjustment; the integrator is connected with the second pulse width modulator, and is used to modulate the negative edge of the input signal of the second pulse width modulator to realize the fine adjustment of the pulse width, and then pass the dual-loop delay-locked loop to the pulse The output signal of the wide modulator is fed back to the phase-locked loop to form a closed loop, so as to be synchronized with the input signal, and then output the pulse signal. The duty cycle of the pulse signal has a larger output range and higher resolution. The application also discloses a pulse generation method and electronic equipment.

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

Images