Dual-function double balanced mixer circuit

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

1995-06-06

1997-07-15

Urban, Edward F.

Telecommunications

Transmitter and receiver at separate stations

455 89, 455326, H04Q 700, H04Q 900

Patent

active

056492880

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.

REFERENCES:
patent: Re31643 (1984-08-01), Waldman
patent: 3696302 (1972-10-01), Gossard
patent: 4468784 (1984-08-01), Jagnow et al.
patent: 4630008 (1986-12-01), Weeks
patent: 4636736 (1987-01-01), Woodworth et al.
patent: 4688263 (1987-08-01), Aldridge
patent: 4726072 (1988-02-01), Yamashita et al.
patent: 4864644 (1989-09-01), Takahashi
patent: 5020092 (1991-05-01), Phillips et al.
patent: 5034994 (1991-07-01), Muterspaugh et al.
patent: 5060298 (1991-10-01), Waugh et al.
patent: 5140705 (1992-08-01), Kosuga
patent: 5157786 (1992-10-01), Muterspaugh
patent: 5170500 (1992-12-01), Broderick
patent: 5259007 (1993-11-01), Yamamoto
patent: 5272721 (1993-12-01), Mikoshiba et al.
patent: 5307518 (1994-04-01), Maeda
patent: 5422931 (1995-06-01), Austin-Lazarus et al.
patent: 5423076 (1995-06-01), Westergren et al.
patent: 5428839 (1995-06-01), Friesen
patent: 5448772 (1995-09-01), Grandfield
patent: 5457734 (1995-10-01), Eryaman et al.

Affiliated with

Also associated with

Rating

Dual-function double balanced mixer circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Dual-function double balanced mixer circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dual-function double balanced mixer circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1501352