Designing an analog filter ... we want an audio waveform out of the PWM, which means a higher frequency AC signal, but in the ADC case we’re interested in the DC component of a low-frequency ...

A low-pass filter is used in order to recover the modulated waveform from the rectangular wave output of the PWM amplifier. The recovered audio waveform modulates the RF carrier, thus completing the ...

[Scott Daniels] spent some time discussing the process of smoothing a PWM output by using a low pass filter. This is a compilation of digital and analog circuitry to produce a smoother signal than ...

Recently there have been a series of design ideas published based on the topic of “processors” of PWM signals. The purpose of these processors is to minimize both the settling time in response to a ...

Editor’s Note: This is a four-part series of DIs proposing improvements in the performance of a “traditional” PWM—one whose output is a duty cycle-variable rectangular pulse which requires filtering ...

The RC filter's corner frequency must be high enough to allow the incoming signal to pass without ... When the PWM output is low, the counter stops. A fixed sample period for the accumulation ...

The delayed (or playback) digital signal ... the audio output comes out at a moderately high impedance (due to the integrator) and has some clock feedthrough. A simple two-pole low-pass filter ...