Power amplifier

Details Power amplifier Power amplifier

2005-12-13

2005-12-13

Choe, Henry (Department: 2817)

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

C330S297000

Reexamination Certificate

active

06975166

ABSTRACT:
The present invention relates to a power amplifier being preferably applied in mobile communication devices andusing an envelope tracking technique. It is the object of the invention to improve a power amplifier with respect to its efficiency by simultaneously enabling an adaptation of the supply voltage for the unit110to fast variations of an envelope signal. This object is achieved by providing a second DC/DC converter140for generating a variety of n+1 voltage levels and n threshold values both in response to a received power control signal representing a required output power of the RF output signal and by a first DC/DC converter130to select one of said n+1 voltage levels as the supply voltage for said unit110in response to the result of a comparison between the envelope signaland said n threshold values.

REFERENCES:
patent: 4831334 (1989-05-01), Hudspeth
patent: 5880633 (1999-03-01), Leizerovich
patent: 6137355 (2000-10-01), Sevic
patent: 6714071 (2004-03-01), Page
patent: 6725021 (2004-04-01), Anderson et al.
patent: 6741127 (2004-05-01), Sasho et al.
“High Efficiency CDMA RF Power Amplifier using Dynamic Envelope Tracking Technique”, by J. Staudinger, IEEE MTT-S Jun. 2000, pp. 873-876.

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