Amplifiers – Signal feedback – Variable impedance in feedback path varied by separate...
Patent
1976-07-06
1978-01-03
Dahl, Lawrence J.
Amplifiers
Signal feedback
Variable impedance in feedback path varied by separate...
330 51, 330103, 330107, 330109, 330129, H03F 136, H03G 320
Patent
active
040669769
ABSTRACT:
An amplifier circuit having a variable transmission factor and an effective transmission frequency band delimited by a lower limit frequency is arranged to enable the value of the lower limit frequency to be varied as a function of a control voltage, by including in the circuit an amplifier member and circuit components defining a feedback path connected between the output of the amplifier and an input thereof which is inverting with respect to the output signals of the amplifier, the components defining the feedback path including an electronically voltage-controllable resistor having a control voltage input and a first frequency dependent impedance connected in parallel with the resistor, and the circuit further including a second frequency dependent impedance connected between the inverting input of the amplifier and a point at the circuit reference potential, and a line for supplying the control voltage to the control voltage input of the controllable resistor.
REFERENCES:
patent: 3433937 (1969-03-01), McCarthy
patent: 3667055 (1972-05-01), Uchida
Dickopp Gerhard
Schroder Ernst
Dahl Lawrence J.
LICENTIA Patent-Verwaltungs-G.m.b.H.
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