VCO Oscillators Circuits / Schematic List - Circuits designed by David A. Johnson, P.E.


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Voltage Controlled Oscillators (VCO) Oscillator Circuits
Designed by David A. Johnson, P.E.

Last Updated on: Monday, April 21, 2008 04:19 AM

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200MHz - 400MHz VOLTAGE controlled OSCILLATOR
If you need a clean emitter coupled logic (ECL) type signal between 200MHz and 400MHz this circuit works fine. It uses four voltage controlled capacitors to change the frequency.

CMOS SCHMITT TRIGGER IC MAKES VCO
By changing the supply voltage fed to a classic 4584 Schmitt trigger type oscillator, the oscillator frequency can be changed over a range of 50:1. A 74HCU04 inverter is used at the output of the 4584 to maintain a constant TTL logic level signal.

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