Low and high frequency oscillators having common voltage regulator circuit
First Claim
1. A low and high frequency signal generating circuit comprising, a low frequency oscillating circuit including an operational amplifier having an inverting and noninverting input and an output, a twin-T feedback network coupled between the output and one of the inverting and noninverting inputs, a voltage regulating circuit connected to the other of the inverting and noninverting inputs, and a high frequency oscillating circuit including a resonant feedback transistor amplifier being biased by voltage supplied by said voltage regulating circuit.
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Abstract
A low frequency modulating signal and a high frequency carrier signal circuit employing a twin-T oscillator having an integrated circuit operational amplifier for producing the modulating signal and an L-C resonant feedback oscillator having a transistor amplifier for producing the carrier signal, and a monitoring shunt regulator for supplying a reference potential to the twin-T oscillator and biasing and operating potentials to the L-C resonant feedback oscillator and for deactivating the L-C resonant feedback oscillator when an increase in resistance occurs in the shunt regulator.
10 Citations
10 Claims
- 1. A low and high frequency signal generating circuit comprising, a low frequency oscillating circuit including an operational amplifier having an inverting and noninverting input and an output, a twin-T feedback network coupled between the output and one of the inverting and noninverting inputs, a voltage regulating circuit connected to the other of the inverting and noninverting inputs, and a high frequency oscillating circuit including a resonant feedback transistor amplifier being biased by voltage supplied by said voltage regulating circuit.
Specification