Dual-function double balanced mixer circuit

Details Dual-function double balanced mixer circuit Dual-function double balanced mixer circuit

1994-05-25

1999-04-06

Cuchlinski, Jr., William A.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

455422, 455 42, 455205, 455209, H04B 126

Patent

active

058930302

ABSTRACT:
A circuit for connecting multiple signal paths within a multi-mode communication device includes a double balanced mixer circuit selectively functioning as a modulation switch during an unbalanced state. As applied to a transmit section of a CDMA/FM cellular telephone, a dual-function double balanced mixer circuit connects a CDMA IF signal path with an FM audio signal path. The double balanced mixer circuit includes a double balanced mixer connected through oscillator input to an external LC (inductor-capacitor) tank connected to both a PLL (phase lock loop) and an FM audio signal. One signal input of the double balanced mixer receives a CDMA low IF signal, while the other double balanced mixer signal input is connected to a microprocessor-controlled switch for selectively unbalancing the balanced mixer while in the FM mode of operation.

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