Telecommunications – Transmitter and receiver at same station – With frequency stabilization
Patent
1996-02-02
1998-09-01
Vo, Nguyen
Telecommunications
Transmitter and receiver at same station
With frequency stabilization
455 83, 455 86, H04B 144
Patent
active
058024476
ABSTRACT:
A radio signal received by an antenna is supplied to a SAW bandpass filter, and a signal of a carrier frequency band is extracted and supplied to a first mixer. On the basis of a first receiving local signal supplied from a local signal generator, the first mixer generates a signal of an intermediate frequency band and supplies the signal to a second mixer. The second mixer demodulates a baseband signal from the intermediate-frequency signal by using a second local signal as an output from a TCXO circuit which generates a reference signal to the local signal generator. The baseband transmitting signal is supplied to a quadrature modulator where a transmitting local signal (carrier-band signal) supplied from the local signal generator is modulated by the baseband transmitting signal. The carrier-band modulated signal is supplied to the antenna via a high-power amplifier and transmitted from the antenna as a radio signal.
REFERENCES:
patent: 4903257 (1990-02-01), Takeda et al.
patent: 5319798 (1994-06-01), Watanabe
patent: 5355524 (1994-10-01), Higgins, Jr.
patent: 5444863 (1995-08-01), Torii
patent: 5467065 (1995-11-01), Turunen et al.
Casio Computer Co. Ltd.
Vo Nguyen
LandOfFree
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