Power boost system for cellular telephone

Telecommunications – Transmitter – Power control – power supply – or bias voltage supply

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Details

455 89, H04B 104

Patent

active

054578140

ABSTRACT:
A power boost system for a portable radiotelephone (10) employs a booster unit (52) to provide sufficient power for operation of the radiotelephone as a mobile unit in a cellular telephone system, and a junction box (54) which, in combination with a mechanical holder (56) allows for hands-free operation of the radiotelephone in the mobile telephone environment. The junction box is provided with a speaker (62) and a microphone (64) to facilitate the hands-free operation. The desired output power level for radiation from a vehicular antenna (72) is provided by a gain-controlled amplifier (80) in response to a pulse-width modulated command signal (48, 90) provided by a computer (12) within the radiotelephone. A memory (70) within the booster unit stores power level data for the higher levels of power to be used during transmission by the booster unit, the power level data being provided to the computer (12) in generating the power command signal. The memory (70) also stores calibration data of the booster unit attained during manufacture of the booster unit, this data being provided to the computer (12) to compensate for measured values of received signal strength for accurate search of the strongest signal.

REFERENCES:
patent: 4636741 (1987-01-01), Mitzlaff
patent: 4654882 (1987-03-01), Ikeda
patent: 4835499 (1989-05-01), Pickett
patent: 5033109 (1991-07-01), Kawano et al.
patent: 5033111 (1991-07-01), Marui
patent: 5101507 (1992-03-01), Jung
patent: 5129098 (1992-07-01), McGirr et al.
patent: 5193219 (1993-03-01), Tamura
patent: 5287557 (1994-02-01), Korycan
patent: 5291147 (1994-03-01), Muurinen

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