Digital power amplifier level control

Details Digital power amplifier level control Digital power amplifier level control

2006-04-04

2006-04-04

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S293000, C330S279000

Reexamination Certificate

active

07023278

ABSTRACT:
A digital power amplifier with variable output power control is disclosed. An amplifying stage includes a first attenuator that applies one of n attenuation steps to an RF signal in response to a desired output power level of the digital power amplifier. A feedback loop provides a gain control signal to the amplifying stage based upon an output of the amplifying stage. The feedback loop includes a second attenuator that applies another of the n attenuation steps to a sample of the output of the amplifying stage. The second attenuator applies the kthhighest of the n attenuation steps when the first attenuator applies the kthlowest of the n attenuation steps, where 1≦k≦n.

REFERENCES:
patent: 5646578 (1997-07-01), Loh et al.
patent: 5977831 (1999-11-01), Davis et al.
patent: 6580901 (2003-06-01), Mochizuki
patent: 6759902 (2004-07-01), Kossor
patent: 2004/0219944 (2004-11-01), Barak et al.

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