Patent ID: 8422969

Claim:
A radio frequency transceiver, comprising: a mixer circuit configured to convert an intermediate frequency signal into a radio frequency signal; a driver amplifier circuit configured to amplify the radio frequency signal from the mixer circuit; a temperature sensing circuit configured for sensing ambient temperature; an attenuation circuit connected with the temperature sensing circuit, configured to decreasingly attenuate the radio frequency signal from the driver amplifier circuit as the ambient temperature increases; a power amplifier circuit for amplifying a radio frequency signal from the attenuation circuit; a voltage scaling circuit coupled to the attenuation circuit for changing an attenuation level of the attenuation circuit to set the level of a radio frequency signal from the power amplifier circuit to a desired value; and a feedback resistor and a first amplifier circuit having a first input being grounded, a second input connected with the variable resistor and the voltage scaling circuit, and an output coupled to the attenuation circuit for applying the attenuation control signal, wherein the feedback resistor is coupled between the second input of the first amplifier circuit and the output of the first amplifier circuit, wherein the voltage scaling circuit comprises a potentiometer and a second amplifier circuit coupled to the potentiometer, wherein the potentiometer is configured to provide an adjustable voltage, and the second amplifier circuit is configured to provide an amplified adjustable voltage to the second input of the second amplifier circuit.