Method and device for biasing a transistor of a radio frequency amplifier stage

An electronic device for biasing a transistor of a radio frequency amplifier stage intended for processing a modulated radio frequency signal emanating from a radio frequency source, the electronic device comprising:

• an input at an amplifier transistor for receiving an input signal provided from a radio frequency signal source;
• and
• closed-loop transconductance slaving means for slaving a time average voltage of the base/emitter or gate/source voltage of the amplifier transistor to a reference voltage corresponding to a desired quiescent current for the amplifier transistor, and wherein an input circuit impedance of a base/emitter or gate/source circuit of the amplifier transistor, as viewed from the base or gate of the amplifier transistor, the input circuit impedance of the base/emitter or gate/source circuit is a small value at a low frequency of the input signal, and large value with respect to an output circuit impedance of the radio frequency signal source at a radio frequency of the input signal.

A remote terminal of a wireless communication system, wherein the remote terminal comprises an electronic device for biasing a transistor of a radio frequency amplifier stage intended for processing a modulated radio frequency signal emanating from a radio frequency source, the electronic device comprising:

• an input at an amplifier transistor for receiving an input signal provided from a radio frequency signal source;
• and
• closed-loop transconductance slaving means for slaving a time average voltage of the base/emitter or gate/source voltage of the amplifier transistor to a reference voltage corresponding to a desired quiescent current for the amplifier transistor, and wherein an input circuit impedance of a base/emitter or gate/source circuit of the amplifier transistor, as viewed from the base or gate of the amplifier transistor, the input circuit impedance of the base/emitter or gate/source circuit is a small value at a low frequency of the input signal, and large value with respect to an output circuit impedance of the radio frequency signal source at a radio frequency of the input signal.