Patent ID: 7852063

Claim:
A power detector comprising: a detection power input circuit for receiving an RF signal; a bias circuit including an output for generating a bias signal in response to a reference control voltage; a detection circuit for generating a power control voltage having a voltage characteristic that offsets temperature characteristics of the received RF signal, the detection circuit forming a current mirror with the bias circuit. wherein a power amplifier is coupled to the bias circuit, the power amplifier comprising a driver stage and a power stage with the driver stage providing said RF signal; wherein the driver stage comprises: a first capacitor including a first terminal for receiving an RF power signal and including a second terminal, a first resistor including a first terminal coupled to the second terminal of the first capacitor and including a second terminal coupled to a power control voltage terminal for receiving the power control voltage from the detection circuit, a first transistor including a base coupled to the second terminal of the first capacitor, including an emitter coupled to a ground terminal and including a collector coupled to a detector power input terminal for providing the RF signal to the detection power input circuit, and a first inductor including a first terminal coupled to the collector of the first transistor and including a second terminal coupled to a voltage supply terminal, wherein the power stage comprises: a second capacitor including a first terminal coupled to the emitter of the first transistor and including a second terminal, a second resistor including a first terminal coupled to the second terminal of the second capacitor and including a second terminal coupled to the second terminal of the first resistor, a second transistor including a base coupled to the second terminal of the second capacitor, including an emitter coupled to the ground terminal, and including a collector, a second inductor including a first terminal coupled to the collector of the second transistor and including a second terminal coupled to the voltage supply terminal, and a filter coupled between the collector of the second transistor and an RF power output terminal for providing an RF power output signal.