Transceiver bandwidth extension using double mixing

Details Transceiver bandwidth extension using double mixing Transceiver bandwidth extension using double mixing

1997-02-19

2000-09-05

Nguyen, Chau

Multiplex communications

Duplex

Communication over free space

455314, H04B 700, H04B 126

Patent

active

06115363&

ABSTRACT:
A radio transceiver system uses a single variable local oscillator frequency source which is used in mixing both before and after a band-pass filter. This causes a reduction in band-pass filter bandwidths. In an all-band transceiver for PCS for example the effect of this reduced bandwidth requirement is to increase the spacing between the transmit bands and the receive bands and thereby enable a reduction in transmission noise interfering with the reception bands.

REFERENCES:
patent: 4879758 (1989-11-01), Deluca et al.
patent: 5108334 (1992-04-01), Eschenbach et al.
patent: 5248943 (1993-09-01), Fox et al.
patent: 5606736 (1997-02-01), Hasler et al.
patent: 5613234 (1997-03-01), Vella-Coleiro
patent: 5678169 (1997-10-01), Turney

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