Multilevel power amplifier architecture using multi-tap...

Details Multilevel power amplifier architecture using multi-tap... Multilevel power amplifier architecture using multi-tap...

2006-10-31

2006-10-31

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including plural amplifier channels

C330S195000

Reexamination Certificate

active

07129784

ABSTRACT:
A multi-level power amplifier architecture using a multi-tap transformer implemented on a single CMOS integrated circuit wireless communications device is described. By providing a multi-tap transformer for coupling a plurality of power amplifiers to a shared output impedance, such as an antenna, power transmission may be made at different levels while maintaining efficiency. With a multi-tap transformer having “N” taps featuring “N” different impedance levels, each tap may be connected to an amplifier cell which delivers power into the transformer at the tap for coupling to the output load. Any one of the “N” amplifier cells can be turned on at once along with any combination of the “N” amplifier cells.

REFERENCES:
patent: 5570062 (1996-10-01), Dent
patent: 6882263 (2005-04-01), Yang et al.

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