Singly-balanced active mixer circuit

Details Singly-balanced active mixer circuit Singly-balanced active mixer circuit

1979-08-30

1983-01-18

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

H04B 126

Patent

active

043695221

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 an 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. DC biasing of the active devices is provided via a floating tap on the primary winding of the output transformer which is not bypassed at the input, LO and IF frequencies. The singly balanced active mixer circuit may be advantageously utilized in a radio having a receiver with broadband front-end RF selectivity.

REFERENCES:
patent: 2538715 (1951-01-01), Weel
patent: 3469212 (1969-09-01), Karl et al.
patent: 3614668 (1971-10-01), Sudoh
patent: 3624506 (1970-03-01), Townsend
patent: 3727078 (1973-04-01), Wollesen

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