Patent ID: 8339179

Claim:
A radio frequency (RF) power detector comprising a power converter for determining a power of an RF signal, the power converter comprising: a first transistor of a first conductivity type having a first current electrode coupled to an output node, a control electrode for receiving a first voltage substantially equal to a first bias voltage plus a positive component of a differential input signal, and a second current electrode; a second transistor of a second conductivity type opposite said first conductivity type having a first current electrode coupled to said second current electrode of said first transistor, a control electrode for receiving a second voltage substantially equal to a second bias voltage plus a negative component of said differential input signal, and a second current electrode coupled to a reference voltage terminal; a third transistor of said first conductivity type having a first current electrode coupled to said output node, a control electrode for receiving a third voltage substantially equal to said first bias voltage plus said negative component of said differential input signal, and a second current electrode; and a fourth transistor of said second conductivity type having a first current electrode coupled to said second current electrode of said third transistor, a control electrode for receiving a fourth voltage substantially equal to said second bias voltage plus said positive component of said differential input signal, and a second current electrode coupled to said reference voltage terminal.