Dual-function double balanced mixer circuit

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

H - Electricity

04

B

H04B 7/204 (2006.01) H03D 7/14 (2006.01) H04L 27/32 (2006.01) H04Q 7/32 (2006.01) H04B 1/04 (2006.01)

Patent

CA 2147921

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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