General Electric Company

L Jubin Lane

George S Chambers

A voltage controlled oscillator for producing an output signal having a frequency proportional to the magnitude of an input control signal includes a tunable filter circuit for simulating a resistance-inductance-capacitance (RLC) circuit with a resonant frequency approximately equal to the base or center frequency around which the voltage controlled oscillator is to operate. Through appropriate feedback means and multiple gain paths within the simulated RLC circuit, there is provided an output signal whose frequency is a function of the input control signal.

Voltage controlled oscillator using a voltage tunable filter with

A frequency to voltage transducer for producing an output signal having a value proportional to the magnitude of the frequency of an input signal includes a tunable filter circuit for simulating a resistance - inductance - capacitance (RLC) circuit with a resonant frequency approximately equal to the anticipated base frequency of the input signal. Through appropriate feedback means and multiple gain paths within the simulated RLC circuit, there is provided an output signal which is proportional in magnitude to the frequency of the input signal.

Frequency to voltage transducer

An electronic filter circuit comprised of summing circuits and integrating circuits is interconnected such that the filter may use the same components to serve either as a band-reject or a band-pass filter having the same natural frequency. Changing of the filter operation between the two modes is accomplished simply by the interchange of two component values.

Active filter with inverse option

A self-tuning filter is provided through the employment of a voltage tunable filter circuit which simulates a series resistor-inductor-capacitor (RLC) circuit and which is tunable to vary or adjust its resonant frequency in response to the value of an input control voltage. The filter is made self-tuning through the provision of suitable circuitry, responsive to simulated inductance and capacitance voltages, to generate the input control voltage and hence render the voltage tunable filter circuit resonant at the frequency of an applied input signal.

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Stuarts Draft, VA, United States of America

L Jubin Lane