Apparatus and method for amplifying a signal

Details Apparatus and method for amplifying a signal Apparatus and method for amplifying a signal

1997-09-30

1999-03-23

Mottola, Steven

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

330134, 330284, H03G 320

Patent

active

058865756

ABSTRACT:
The apparatus includes an amplifier (204) having an input and an output, the amplifier output coupled to an input of a Doherty amplifier (208). The Doherty amplifier (208) includes a control input and a Doherty output. The apparatus further includes a detector (224) having an input coupled to the output of the Doherty amplifier (208). The detector provides a detected signal at its output, to a controller (228), the controller responding to the detected signal by producing a first (230) and second control output (231). The first control output is coupled to a switching regulator (232) input, the switching regulator having an output coupled to the control input of the Doherty amplifier. The second control output is coupled to a control input of a variable attenuator (202), the output of the variable attenuator coupled to the input of the amplifier (204).

REFERENCES:
patent: 3900823 (1975-08-01), Sokal et al.
patent: 5179353 (1993-01-01), Miyake
patent: 5420541 (1995-05-01), Upton et al.
patent: 5757229 (1998-05-01), Mitzlaff

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