Doherty bias circuit to dynamically compensate for process...

Details Doherty bias circuit to dynamically compensate for process... Doherty bias circuit to dynamically compensate for process...

2005-07-12

2005-07-12

Nguyen, Khanh V. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including plural amplifier channels

C330S296000

Reexamination Certificate

active

06917246

ABSTRACT:
The invention includes a Doherty power amplifier system having a Doherty power amplifier electrically connected to a Doherty bias circuit. The Doherty amplifier includes a carrier amplifier and peaking amplifier. The Doherty bias circuit includes a current mirror and a first node that works to maintain a constant current in the current mirror as a function of a base voltage at the first node. The base voltage that results in a constant current is passed from a current mirror circuit to the carrier amplifier. The base voltage is at least one of scaled and shifted to produce a second voltage at a second node by employing a scaling/level shifting circuit. The scaling/level shifting circuit includes an input electronically connected to the current mirror circuit. The second voltage is passed through a voltage buffer to the peaking amplifier. An effect of the invention is to generate bias voltages for a Doherty amplifier that dynamically adjust to compensate for manufacturing process and environmental changes.

REFERENCES:
patent: 5739723 (1998-04-01), Sigmon et al.
patent: 5757229 (1998-05-01), Mitzlaff
patent: 6097252 (2000-08-01), Sigmon et al.
patent: 6262629 (2001-07-01), Stengel et al.
patent: 6285251 (2001-09-01), Dent et al.
patent: WO 97/20385 (1997-06-01), None

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