Patent ID: 9294055
Filing Date: 2016-03-22
CPC Classification: H03F

Claim Text:
1. A semiconductor die comprising: a power amplifier configured to amplify a radio frequency input signal to generate a radio frequency output signal; a reference voltage generator configured to receive a control voltage that controls a bias current of the power amplifier and to generate a reference voltage by translating a voltage level of the control voltage, the reference voltage having a voltage level greater than the voltage level of the control voltage, the reference voltage generator including a first field effect transistor (FET) having a source configured to generate the reference voltage and a drain configured to receive a switch bias voltage, the reference voltage generator further including a first bipolar transistor and a first resistor, the first bipolar transistor having an emitter configured to receive the control voltage and a collector electrically connected to the switch bias voltage through the first resistor; and a bias circuit configured to receive the reference voltage and to convert the reference voltage to a reference current, the bias circuit further configured mirror the reference current to control the bias current of the power amplifier.