PWM Detector Using Integrator

Status
Not open for further replies.

vinodquilon

Full Member level 3
Joined
Oct 24, 2009
Messages
158
Helped
2
Reputation
4
Reaction score
2
Trophy points
1,298
Activity points
2,558
How can I demodulate a PWM (Pulse Width Modulation) signal using an Integrator ?
 

You might use an even simpler, RC network. All you want is
the time-averaged voltage.
 

A LC low pass filter can also demodulate a PWM back to sin waveform. This is the principle used in class D amplifier.
 

An integrator can determine the duty cycle in exactly one pwm period, but it would need a sync signal with modulation schemes
that are shifting both edges. Furthermore it needs a sample and hold at the integrator output.
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…