The first is the direct sample and hold circuit. When the sample and hold oscillator is high, and the switch is closed, the VCO tracks the pitch oscillator, and when the S&H oscillator goes low ...

The design files for the sound circuit are in a Google drive folder ... using a 4000-series IC oscillator, a CMOS VCO, and the ubiquitous LM386 audio amplifier. If you are going to a party as ...

With modern CMOS processes the logic required for the Δ Σ modulator ... For example, a transient simulation of the extracted circuit of the VCO in SPICE took 14 min while AFS took 1.5 min, a speedup ...