Wave transmission lines and networks – Negative resistance or reactance networks of the active type – Simulating specific type of reactance
Patent
1985-07-15
1987-02-17
Gensler, Paul
Wave transmission lines and networks
Negative resistance or reactance networks of the active type
Simulating specific type of reactance
307490, 330107, 330294, 331177R, 333217, H03H 1148, H03H 1152
Patent
active
046443061
ABSTRACT:
A predetermined and variable synthesized capacitance which may be incorporated into the resonant portion of an electronic oscillator for the purpose of tuning the oscillator comprises a programmable operational amplifier circuit. The operational amplifier circuit has its output connected to its inverting input, in a "follower" configuration, by a network which is low impedance at the operational frequency of the circuit. The output of the operational amplifier is also connected to the non-inverting input by a capacitor. The non-inverting input appears as a synthesized capacitance which may be varied with a variation in gain-bandwidth product of the operational amplifier circuit. The gain-bandwidth product may, in turn, be varied with a variation in input set current with a digital to analog converter whose output is varied with a command word. The output impedance of the circuit may also be varied by varying the output set current. This circuit may provide very small changes in oscillator frequency with relatively large control voltages unaffected by noise.
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Gensler Paul
Manning John R.
Sandler Ronald F.
The United States of America as represented by the administrator
Tresansky John O.
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