Patent ID: 7912432

Claim:
A circuit, comprising: a detection circuit coupled with an output stage of a radio frequency (RF) amplifier circuit; and a summing network having a first voltage input, a second voltage input, and an output, wherein the first voltage input is capable of receiving a voltage that is proportional with a current flowing through the output stage of the RF amplifier circuit, the second voltage input is coupled with the detection circuit, and the output is capable of providing a summing voltage; wherein: the output of the summing network is a summing voltage based on: V S =α×V 2+β×max(0 ,I−I T ) wherein α and β are representative of fixed gains, I T is representative of a threshold value of a threshold current, I is representative of the current flowing through the output stage of the RF amplifier circuit, and V 2 is the voltage at the second voltage input of the summing network.