Patent ID: 7103328

Claim:
An integrated circuit for measuring power transfer between a first node and a second node comprising: a coupler circuit comprising: a first coupler port directly connected to the first node for receiving a RF output signal and a second coupler port directly connected to the second node for providing the RF output signal therefrom, the first coupler port and the second coupler port being electrically coupled, a third coupler port and a fourth coupler port, the fourth coupler port for providing a first signal indicative of forward propagating RF energy propagating from the first coupler port to the second coupler port and the third coupler port for providing a second signal indicative of backwards propagating RF energy propagating from the second coupler port to the first coupler port; and, detection circuitry comprising: a first input port coupled to the fourth coupler port for receiving the first signal indicative of forward propagating RF energy; a second input port coupled to the third coupler port for receiving the second signal indicative of backwards propagating RF energy; a first detected energy output signal port for providing a first detected energy output signal; a second detected energy output signal port for providing a second detected energy output signal; and wherein the detection circuitry comprises: a second detector circuit having an input port for receiving the second signal indicative of backward propagating RF energy and having an output port for providing a second intermediate detected signal in dependence upon the second signal indicative of backward propagating RF energy; a second reference circuit having an output port for providing a second reference signal therefrom; and, a second difference amplifier circuit having a first input port, a second input port and an output port, the first input port for receiving the second intermediate detected signal, the second input port for receiving the second reference signal and the output port directly connected to the second detected energy output signal port for providing the second detected energy output signal therefrom.