Transmitter power amplifier ramping method

Details Transmitter power amplifier ramping method Transmitter power amplifier ramping method

2011-03-01

2011-03-01

Le, Nhan (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S240100, C455S334000, C375S345000

Reexamination Certificate

active

07899424

ABSTRACT:
A method for reducing frequency glitches in a digital transceiver due to power amplifier input impedance variations. According to the method, the power amplifier is switched on after the end of a prior packet reception period and before a new packet transmission begins. Instead of ramping the power amplifier gain, the method ramps the modulation signals. As a consequence, any VCO frequency transients that may result from turning on the power amplifier have an opportunity to decay before the new packet transmission is initiated. This technique effectively isolates the transmitter power amplifier from the frequency synthesizer VCO to facilitate fast switching transceiver operation.

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