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Voltage control TTL symmetric harmonic oscillator circuit

2016-08-27 04:52  
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The voltage control TTL symmetric harmonic oscillator circuit uses the external control voltage VA to control the Inverter input voltage. The output frequency of the circuit is proportional to the VA, and it has wide adjustment range. If the VA change from 1.4V to 1.8V, the oscillation frequency is from 666KHz to 1.43MHz. The circuit (b) increases the bias resistors R1, R2 and R3, R4 than circuit (a). The D1 and D2 are the protection diodes. When the VA is from 0V to 10.5V, the frequency changes from 6.54MHz to 4.76MHz.