一种高精度脉宽调制信号移相电路设计

Design of a PWM signal phase shift circuit

设计了一种基于1.5μm BiCMOS工艺下的脉宽调制信号移相电路。该电路可应用于发光二极管驱动芯片中,对调光脉宽调制信号进行移相。电路设计有三种模式以应用在不同的场合,可进行零度、180°和任意度的移相。测试结果表明:在100 Hz到20 kHz脉宽调制信号下,电路的三种模式都能保证信号的精度与移相的稳定。

A pulse width modulation signal phase shift circuit based on 1.5 μm BiCMOS process was designed.This circuit can be used in LED driver chip to shift the phase of the dimming PWM signal.The circuit had three different modes to be adapted in different situation,shifting 0°,180°or any degree of phase.The test results show that,at 100 Hz to 20 kHz PWM signal,the circuit＇s three modes work fine with precision and stability.