A power amplifier protection circuit that includes protection circuitry to variably shunt an input radio frequency (RF) signal to AC ground, turn off bias to an output transistor of a power amplifier, and turn off the output transistor. The power amplifier protection circuit features an asymmetrical...http://www.google.com/patents/US7268990?utm_source=gb-gplus-sharePatent US7268990 - Power amplifier protection
