Telecommunications – Transmitter and receiver at same station – With a common signal processing stage
Patent
1994-01-14
1996-12-31
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at same station
With a common signal processing stage
455 84, 375334, H04B 144
Patent
active
055904130
ABSTRACT:
A radio transceiver including an antenna for transmitting and receiving radio signals, a reception section for selecting a received carrier signal, a transmission amplifier section for amplifying signals to be broadcast, a mixer, coupled between the reception section and the transmission section, a variable frequency generator for generating local frequencies for the mixer, and a first (synphase) quadrature demodulating channel and a second (square) channel demodulating channel. The mixer includes a first switch, a first double balanced (DB) mixer, intermediate frequency (IF) filter, IF amplifier, power divider, and a second DB mixer. These components are used during both transmission and reception by the radio transceiver.
REFERENCES:
patent: 3909527 (1975-09-01), Ohta et al.
patent: 5373300 (1994-12-01), Jenness et al.
"High Speed Continuous-Phase FSK Modulation and Demodulation System" by Morihino et al 1980.
Baehr Geoffrey G.
Galitsky Alexander V.
Kondratiev Victor K.
Kouplitchenko Valery P.
Crean Timothy J.
Eisenzopf Reinhard J.
Le Thanh
Rose James W.
Sun Microsystems Inc.
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