Inverters form three-phase VCO

Posted on Aug 27, 2012

The inspiration for the VCO in Figure 1 came from Texas Instruments application notes of years ago, detailing the use of unbuffered U-type inverters for use in ring oscillators. The application notes circuit consists of only the inverters. The circuit generates relatively squarish waveforms. Any ring oscillators operation depends on the fact that an odd number of inversions exists around the loop.

Inverters form three-phase VCO
Click here to download the full size of the above Circuit.

Any odd number of inverters would work.The feedback is inverting, or negative. The feedback creates an initial bias equilibrium at the transition voltage for the gates. Loop gain greater than unity is a necessary condition for oscillation. Unbuff

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