Variable resistance circuit

Details Variable resistance circuit Variable resistance circuit

1976-03-26

1977-03-22

Heyman, John S.

Amplifiers

Variable impedance for signal channel controlled by separate...

Electron tube or diode as impedance

307237, 328171, 328172, 330 86, H03G 1100, H03G 312, H03G 318, H03F 316

Patent

active

040139751

ABSTRACT:
A variable resistance circuit comprising a field effect transistor, a plurality of amplifiers and a feedback circuit for one of the amplifiers with the equivalent resistance value derived from a circuit comprising the field effect transistor electrodes and a reference resistor being controlled by a digital signal or a pulse-width signal supplied to the feedback circuit.

REFERENCES:
patent: 3177350 (1965-04-01), Abbott et al.
patent: 3539936 (1970-11-01), McGhee
patent: 3544812 (1970-12-01), Riso
patent: 3629720 (1971-12-01), Sedra et al.
patent: 3631262 (1971-12-01), Jarrett
patent: 3652791 (1972-03-01), Sheuy
patent: 3882330 (1975-05-01), Galpin
patent: 3918003 (1975-11-01), Seidel
Macken, "F.E.T.s as Variable Resistances in Op. Amps and Gyrators"; Electronic Engrg.; 12/1972; pp. 60-61.

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