Wideband frequency synthesizer for direct conversion transceiver

Details Wideband frequency synthesizer for direct conversion transceiver Wideband frequency synthesizer for direct conversion transceiver

1997-04-17

1999-04-13

Cumming, William

Telecommunications

Transmitter and receiver at same station

With a common signal processing stage

455 87, 455208, 332127, 332144, H04B 140, H04B 116, H03C 306, H03C 300

Patent

active

058945920

ABSTRACT:
A wideband phase-lock loop frequency synthesizer (200) used in a radio transceiver capable of being reconfigured to operate in either a transmit, receive, or battery save mode. The wideband phase-lock loop frequency synthesizer (200) includes, a divide-by-two divider (205), quadrature detector (204), offset VCO (209) and offset mixer (207) for generating a quadrature phase modulated signal. Moreover, a programmable filter (211) is used for removing predetermined harmonic components of the offset mixed signal enabling the synthesizer to operate over a wide frequency range.

REFERENCES:
patent: 4052672 (1977-10-01), Enderby et al.
patent: 4837853 (1989-06-01), Heck
patent: 5079526 (1992-01-01), Heck
patent: 5375258 (1994-12-01), Gillig
patent: 5444865 (1995-08-01), Heck

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