Parallel resonant circuit with feedback means for increasing Q

Details Parallel resonant circuit with feedback means for increasing Q Parallel resonant circuit with feedback means for increasing Q

1975-06-20

1976-06-22

Kominski, John

Oscillators

Solid state active element oscillator

Transistors

331117R, 333 80T, H03B 706

Patent

active

039654419

ABSTRACT:
In a parallel resonant circuit having an inductor connected in parallel with a capacitor, a sensing resistor is connected in series with the inductor to sense the current in the resonant circuit. The voltage drop across the sensing resistor is applied to an operational amplifier and the amplified output voltage is fed back to the circuit loop out of phase with the sensed voltage drop so as to reduce the effective circuit resistance and thereby increase the circuit Q.

REFERENCES:
patent: 3470500 (1969-09-01), Orchard et al.

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