a multistage rf amplifier amplifies rf signals used for communication in a wlan communications system . the multistage rf amplifier comprises a first amplifier circuit coupled to a second amplifier circuit to maximize amplification . a common mode of the first amplifier circuit is coupled to a common mode of the second amplifier circuit to provide a voltage offset . the voltage offset counters voltage changes due to oscillations in the first amplifier circuit , thereby reducing interference from the multistage rf amplifier .