Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent
1997-02-25
1999-11-02
Chin, Wellington
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
455 383, 455343, 375345, H04B 700, H04B 116, H04L 2708
Patent
active
059786906
ABSTRACT:
The battery life of a portable radiotelephone is increased by providing a variable instead of a fixed value of collector-emitter current for the low noise transistor in the RF receiving stage. In particular, the collector current of the RF receiving stage is microprocessor controlled in inverse proportion to the strength of the received signal, an indication of which is advantageously taken from the normally provided "RSSI" output signal provided by the radiotelephone set's conventional IF chip. The microprocessor stores an indication of the correct amount of base current drive to be supplied to the RF transistor to determine its collector current for strong signal and weak signal conditions as well as monitoring collector current for varying base drive to compensate for temperature effects.
REFERENCES:
patent: 3577103 (1971-05-01), Sparks
patent: 4754233 (1988-06-01), Pickett
patent: 4977611 (1990-12-01), Maru
patent: 5001776 (1991-03-01), Clark
patent: 5129098 (1992-07-01), McGirr et al.
patent: 5442345 (1995-08-01), Kwon
Das Sukla R.
Shvarts Emanuil Y.
Chin Wellington
Lucent Technologies - Inc.
Smith Sheila
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