Broadband circuit with rapidly variable resistor

Details Broadband circuit with rapidly variable resistor Broadband circuit with rapidly variable resistor

1980-12-04

1983-07-26

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307358, 307493, 307495, 330144, 330284, H03L 500, H03G 320

Patent

active

043956432

ABSTRACT:
To provide for essentially inertia-free amplitude adjustment of video signals, an electrical circuit is provided with a field effect transistor having variable source-drain resistance. The circuit includes two junction transistors which are connected to the gate electrode of the field effect transistor and either to the source electrode or the drain electrode. One such transistor is connected as an impedance converter, and the other in grounded base configuration. By means of a variable voltage applied to a resistor is connected to the gate electrode of the field effect transistor, source-drain resistance of the field effect transistor can be varied essentially linearly.

REFERENCES:
patent: 3537025 (1970-10-01), Baum et al.
patent: 3633044 (1972-01-01), Buckstad
patent: 3904975 (1975-09-01), Satoh
patent: 3968452 (1976-07-01), Sahara et al.
patent: 3969680 (1976-07-01), Wermuth
patent: 4077014 (1978-02-01), Satoh
patent: 4220931 (1980-09-01), Hines et al.
patent: 4306202 (1981-12-01), Schroder
Davis, "Bi-FET OP AMPS Simplify AGC Threshold Design"; Electronics, pp. 184-185; 4/21/81; vol. 54, No. 7.
Analog Multiplizierer mit isolierenden Kopplern. Elektronik 1968, Heft 8, pp. 233-238, esp 237-238.
W. Gosling, Circuit Applications of FET's Part 3, Applications Below Pinch-Off, British Comm. & Electronics, Dec. 1964, pp. 856-858.

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