Wave transmission lines and networks – Negative resistance or reactance networks of the active type – Simulating specific type of reactance
Patent
1979-09-24
1983-05-10
Gensler, Paul L.
Wave transmission lines and networks
Negative resistance or reactance networks of the active type
Simulating specific type of reactance
307520, H03H 1112, H03H 1148
Patent
active
043832300
ABSTRACT:
An active filter provides precision filtering of an output signal over a wide range of signal input frequencies. Overall the active filter comprises a simulated L/C resonating loop which includes: a first operational amplifier in a loop with an operational transconductance amplifier simulating a capacitance; and a second operational amplifier in a second loop with a second operational transconductance amplifier simulating an inductance. The apparent capacitance of the first loop and the apparent inductance of the second loop can be regulated by applying a control current to each of the operational transconductance amplifiers. In a preferred embodiment the control current is derived as an antilogarithm of a linear voltage where the linear voltage corresponds to the logarithm of the filter resonant frequency. The filter output provides a constant percentage band width signal independent of the tuned frequency. The amplitude gain at resonance similarly is independent of the tuned frequency.
REFERENCES:
patent: 3835399 (1974-09-01), Holmes
patent: 3972006 (1976-07-01), Ruegg
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