Dual rate power control loop for a transmitter

Details Dual rate power control loop for a transmitter Dual rate power control loop for a transmitter

1995-03-30

1997-12-09

Eisenzopf, Reinhard J.

Telecommunications

Transmitter

With feedback of modulated output signal

455127, 455115, 330141, 330281, 370294, H04B 104

Patent

active

056970749

ABSTRACT:
A power control loop for a radio frequency transmitter includes a power control amplifier, an output and a detector that is coupled to the output for providing an output power signal indicative of output power from the power control loop. A controller generates at least first and second reference signals. A differential amplifier provides a control output that is indicative of a difference between the output power signal and a reference signal. A dual rate filter couples the control output to the power control amplifier so as to vary its gain. The dual rate filter exhibits a fast-reacting filter mode when the controller changes the reference signals to the differential amplifier and a slow-reacting filter mode when the controller applies the first reference signal to the differential amplifier. The fast filter mode enables rapid feedback of the control output to the power control amplifier.

REFERENCES:
patent: 3620631 (1971-11-01), Stopka et al.
patent: 4019150 (1977-04-01), Lurey et al.
patent: 4458209 (1984-07-01), Miller et al.
patent: 4636741 (1987-01-01), Mitzlaff
patent: 4992753 (1991-02-01), Jenson et al.
patent: 5179353 (1993-01-01), Miyake
patent: 5276917 (1994-01-01), Vanhanen et al.
patent: 5296821 (1994-03-01), Petersen et al.
patent: 5337201 (1994-08-01), Oyama
patent: 5416441 (1995-05-01), Nagano
patent: 5566363 (1996-10-01), Senda

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