Feed-forward RSSI assisted radio frequency amplifier power contr

Details Feed-forward RSSI assisted radio frequency amplifier power contr Feed-forward RSSI assisted radio frequency amplifier power contr

1995-12-14

1998-04-14

Urban, Edward F.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

4552351, 4552461, 330136, H04B 106

Patent

active

057405247

ABSTRACT:
A selective call receiver (100) includes a radio frequency amplifier (202) having an output power level that is controllable. A radio frequency level sensor (500) generates a sensor output signal in response to an input signal level received at the radio frequency amplifier (202). The receiver also includes a RSSI signal (208) that indicates a relative strength of an on-channel signal received at the radio frequency amplifier and recovered by the selective call receiver. The amplifier output power level adjustment circuit that operates to adjust a power gain of the radio frequency amplifier (202) in an unconditionally stable feed-forward manner based on the sensor output signal and the RSSI signal, such that the output power level remains substantially constant when the input signal level sensed by the radio frequency level sensor (500) substantially reaches or exceeds a first predetermined signal overload level or the received on-channel signal substantially reaches or exceeds a second predetermined signal level.

REFERENCES:
patent: 3918003 (1975-11-01), Seidel
patent: 4169219 (1979-09-01), Beard
patent: 4811423 (1989-03-01), Eastmond
patent: 5001776 (1991-03-01), Clark
patent: 5208549 (1993-05-01), Andoh
patent: 5359607 (1994-10-01), Nguyen et al.
patent: 5369759 (1994-11-01), Tsunoda
patent: 5535444 (1996-07-01), Grandfield
patent: 5564092 (1996-10-01), Grandfield et al.

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