Patent ID: 7839210

Claim:
A detector of a radio-frequency signal, comprising: at least one first MOS transistor with a channel of a first type, having a gate of the at least one first MOS transistor coupled to an input terminal capable of receiving said radio-frequency signal; a circuit for providing a filtered output signal representative of a drain-to-source current in the at least one first MOS transistor, a first current source; and an auto-bias circuit comprising at least one second MOS transistor with a channel of the first type, the at least one second MOS transistor configured as a diode and forming at least one current mirror with the at least one first MOS transistor, the auto-bias circuit configured to bias the at least one first MOS transistor to a level lower than a threshold voltage of the at least one first MOS transistor, the auto-bias circuit further comprising: a first impedance comprising at least one third MOS transistor with a channel of a second type, the at least one third MOS transistor configured as a diode; and a second current source in series with the first impedance, second current source comprising at least one fourth MOS transistor with a channel of the first type, a total number of fourth transistors being identical to a total number of first transistors, the at least one fourth MOS transistor forming at least one current mirror with the at least one second MOS transistor.