Telecommunications – Transmitter and receiver at same station – With frequency stabilization
Patent
1984-03-23
1986-10-21
Ng, Jin F.
Telecommunications
Transmitter and receiver at same station
With frequency stabilization
455 77, 455183, 455186, H04B 140
Patent
active
046189971
ABSTRACT:
A micrprocessor-controlled, frequency-synthesized radio transceiver system comprise a microprocessor for controlling the synthesis of local-oscillator frequencies for both the transmitting and receiving of radio signals. The microprocessor has a predetermined control capacity significantly smaller than the capacity required to control the synthesis of local-oscillator frequencies for a first plurality of radio frequencies. A transmitter circuit and a receiver circuit are capable of operating at all radio frequencies within the same predetermined band of frequencies. A control input arrangement permits customizing the microprocessor to control the synthesis of local-oscillator frequencies for a second plurality of radio frequencies within its predetermined control capacity. A phase-locked loop system is also provided for synthesizing the local oscillator frequencies, and comprises a VCO responsive to each of a plurality of predetermined voltage levels for generating an oscillatory signal at a corresponding frequency, a PLL control circuit coupled with the VCO and responsive to predetermined master control signals, each corresponding to a desired frequency, for producing a corresponding voltage level, and a pre-scaler circuit coupled intermediate the VCO and the PLL control circuit and responsive to the oscillatory signal for producing a scaled feedback control signal at a much lower frequency. The PLL control circuit is responsive to the feedback control signal for locking in the frequency of the oscillatory signal to the desired frequency.
REFERENCES:
patent: 4153877 (1979-05-01), Fathauer et al.
patent: 4245351 (1981-01-01), Tults
patent: 4254504 (1981-03-01), Lewis et al.
patent: 4377871 (1983-03-01), Borras et al.
patent: 4484355 (1984-11-01), Henke et al.
Imazeki Kazuyoshi
Miyakoshi Hiromichi
Tanaka Toshiyuki
General Research of Electronics Inc.
Ng Jin F.
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