Multi-mode amplifier system

Details Multi-mode amplifier system Multi-mode amplifier system

2006-05-09

2006-05-09

Urban, Edward F. (Department: 2685)

Telecommunications

Transmitter

Power control, power supply, or bias voltage supply

C455S127400, C330S010000

Reexamination Certificate

active

07043213

ABSTRACT:
An amplifier system is provided that switches between a linear mode of operation, an envelope tracking mode of operation and a polar mode of operation. The amplifier system switches between modes of operation based upon a characteristic of an input signal relative to a first threshold level and a second threshold level. A mode selector selects the operation mode by transmitting an amplitude modulated signal plus a variable headroom voltage to a supply terminal of a power amplifier during the envelope tracking mode, an amplitude modulated signal to the supply terminal and phase modulated input signal during the polar mode and a substantially constant amplitude signal to the supply terminal during the linear mode.

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