Interface between SAW filter and Gilbert cell mixer

Details Interface between SAW filter and Gilbert cell mixer Interface between SAW filter and Gilbert cell mixer

1994-11-30

1996-05-07

Mis, David

Modulators

Amplitude modulator

Including discrete semiconductor device

332135, 332146, 333193, 348 11, 348 12, 375257, 455 51, 455118, 455333, H03C 102, H03H 952, H04B 104, H04N 710

Patent

active

055150144

ABSTRACT:
The invention concerns multipliers used to modulate a carrier by a signal. The signal is delivered by a Surface Acoustic Wave (SAW) filter, which requires a load impedance of low value, in the range of tens of ohms, and almost certainly less than 200 ohms. The invention modifies a Gilbert multiplier such that its signal-input stage presents the required load impedance to the SAW. The input impedance of the signal-input stage is adjustable.

REFERENCES:
patent: 4553161 (1985-11-01), Citta
patent: 4682344 (1987-07-01), Somer
patent: 5051709 (1991-09-01), Birkett et al.
patent: 5170500 (1992-12-01), Broderick
patent: 5329319 (1994-07-01), Sgrignoli
patent: 5379457 (1995-01-01), Nguyen
patent: 5410742 (1995-04-01), Yajima

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