Method and architecture for dual-mode linear and saturated...

Details Method and architecture for dual-mode linear and saturated... Method and architecture for dual-mode linear and saturated...

2007-02-13

2007-02-13

Ghayour, Mohammed (Department: 2611)

Pulse or digital communications

Transmitters

Antinoise or distortion

C375S308000, C330S297000, C332S100000

Reexamination Certificate

active

10740238

ABSTRACT:
An RF transmitter provides both GSM and EDGE capability by implementing collector voltage control over the power transistor(s) in a power amplifier. During EDGE mode, linear base-biasing a power amplifier (PA) allows collector control to provide either saturated mode PA operation (during ramp up/ramp down) or linear mode PA operation (during data burst). Collector control can therefore be used to provide the accurate ramp up and ramp down profiles required for both GSM and EDGE burst output signals, and can also be used to set the level of the constant envelope data burst of a GSM burst output signal, while linear mode PA operation can provide the non-constant envelope EDGE data burst. A variable gain amplifier is used to adjust the input signal to the power amplifier such that the desired transmission level is achieved.

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