Balanced active mixer circuit

Details Balanced active mixer circuit Balanced active mixer circuit

1978-07-03

1980-03-11

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

455333, H04B 116

Patent

active

041930363

ABSTRACT:
A singly-balanced active mixer circuit is disclosed for developing an IF signal by combining an RF signal and a local oscillator (LO) signal. The RF and LO signals are applied to a strip transmission line ring which provides balanced components of the LO signal to a pair of active devices arranged in a singly-balanced active mixer. The active devices are coupled directly, or via a balanced PI-network to the primary winding of an output transformer for application to the following IF stage of the radio receiver. The singly balanced active mixer circuit may be advantageously utilized in a radio having a receiver with broadband front-end RF selectivity.

REFERENCES:
patent: 3659206 (1972-04-01), Hallford
patent: 3681697 (1972-08-01), Moroney
patent: 3716730 (1973-02-01), Cerny, Jr.
patent: 3831097 (1974-08-01), Neuf
patent: 4080573 (1978-03-01), Howell
"FETs in Balanced Mixers" by Oxner, Siliconix, Inc., Application Note AN-72-1, 1976.

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