PWM control signal generation method, circuit and chip

Abstract

The invention discloses a PWM control signal generation method and circuit and a chip The method comprises the steps: obtaining an initial time signal; performing multi-stage delay operation on the initial time signal to generate a plurality of timing signals in one-to-one correspondence with the multi-stage delay operation, wherein different timing signals have the same precision and different phases; carrying out PWM modulation on the plurality of timing signals to generate a plurality of PWM control signals in one-to-one correspondence with the timing signals; performing multi-phase PWM logic integration on the plurality of PWM control signals to obtain PWM control signals with target precision. Through the implementation of the invention, the high-precision PWM control signal with anypulse width can be obtained through the low-precision clock signal, the operation is simple, the design difficulty of a digital circuit is simplified, and the implementation difficulty of the digitalcircuit is reduced.

Description

technical field [0001] The invention relates to the technical field of digital circuits, in particular to a method for generating a PWM control signal, a circuit and a chip. Background technique [0002] Pulse width modulation (PWM), as an effective analog control method that uses digital signals to control analog circuits, has been widely used in many application fields, such as measurement, communication, various power control and conversion, etc. technical field. PWM can modulate the bias of the transistor base or MOS transistor gate according to the change of the corresponding load, so as to realize the change of the conduction time of the transistor or MOS transistor, so as to realize the change of the output of the switching regulated power supply or the constant current source. [0003] With the development of electronic technology, a variety of pulse width modulation techniques have emerged, including: phase voltage control PWM, pulse width PWM method, random PWM, S...

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that it is difficult to obtain a high-precision PWM signal in the prior art, thereby providing a generation method, circuit and chip of a PWM control signal

Images