Combiner circuit for dual band voltage controlled oscillators

Details Combiner circuit for dual band voltage controlled oscillators Combiner circuit for dual band voltage controlled oscillators

1998-03-17

2000-01-04

Vo, Nguyen

Telecommunications

Transmitter and receiver at same station

With frequency stabilization

455 78, 455553, 4551881, 333132, 333134, H04B 140, H04M 100

Patent

active

060119594

ABSTRACT:
Dual band voltage controlled oscillators (VCOs) incorporate a combiner circuit with a single output operable at two widely separated frequency bands such as 900 MHz and 1.8 GHz, for example. The combiner circuit includes a duplexer used as a combiner on the outputs of the VCOs. The duplexer can be realized in transmission line or inductor configurations. The use of the duplexer improves spurious performance and phase noise by more than 10 dB between the two operating frequency bands and supplies band rejection at the non-operating frequency.

REFERENCES:
patent: 3733608 (1973-05-01), McGhay et al.
patent: 5163181 (1992-11-01), Koontz
patent: 5386203 (1995-01-01), Ishihara
patent: 5424695 (1995-06-01), Konishi
patent: 5625674 (1997-04-01), Paniccia, Jr.
Montress et al., "Introduction to High Stability Saw Oscillators: Design and Performance," 1996 IEEE International Frequency Control Symposium, Jun. 7, 1996, p. 18-20.

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