Method for reducing the 2nd order intermodulation level of a transconductor, and corresponding transconductor

A receiver comprising:

• a transconducting device comprising
• at least one transistor comprising a control electrode for receiving an input signal whose frequency spectrum contains two different frequencies, an output electrode for delivering an output signal, and a third electrode, and
• a feedback controller for feedback-controlling a voltage on the third electrode based upon a reference voltage, and comprising a negative feedback loop with resistive damping coupling the third electrode and the control electrode, and having an open-loop gain greater than unity at a frequency equal to a frequency separation between the two different frequencies;
• a mixer coupled to the output electrode of said transconducting device;
• and
• a load coupled between a power supply terminal and an output of said mixer.

A cellular mobile telephone comprising:

• an antenna;
• and
• a receiver coupled to said antenna and comprising
• a transconducting device comprising
• at least one transistor comprising a control electrode for receiving an input signal whose frequency spectrum contains two different frequencies, an output electrode for delivering an output signal, and a third electrode, and
• a feedback controller for feedback-controlling a voltage on the third electrode based upon a reference voltage, and comprising a negative feedback loop with resistive damping coupling the third electrode and the control electrode, and having an open-loop gain greater than unity at a frequency equal to a frequency separation between the two different frequencies;
• a mixer coupled to the output electrode of said transconducting device;
• and
• a load coupled between a power supply terminal and an output of said mixer.