CPC H04B 1/40 (2013.01) [H03F 1/0216 (2013.01); H03F 3/245 (2013.01); H03F 2200/451 (2013.01)] | 20 Claims |
1. A mobile device comprising:
a transceiver configured to generate a radio frequency input signal; and
a front end system including a cascode power amplifier configured to receive power from a power amplifier supply voltage and to amplify the radio frequency input signal, and a bias circuit configured to bias the cascode power amplifier with a first cascode bias voltage, the bias circuit including a bandgap reference circuit configured to generate a bandgap reference voltage, a bias voltage generator configured to receive power from the power amplifier supply voltage and to generate a plurality of selectable bias voltages based on the bandgap reference voltage, and a bias voltage selector configured to choose the first cascode bias voltage from amongst the plurality of selectable bias voltages.
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