Patent ID: 8653895
Filing Date: 2014-02-18
Classification: H03F

Abstract:
1. A circuit comprising a reference source for supplying a bias signal to set a differential transconductance of an amplifier transistor in an amplifier to a predetermined value, the reference source comprising: at least one reference transistor, comprising a control electrode and a main current channel; a feedback circuit with an input coupled to the main current channel of the reference transistor or reference transistors and an output coupled to the control electrode of the reference transistor or reference transistors, configured to control a control voltage at the control electrode, the feedback circuit being configured to equalize an offset current and a difference between main currents flowing through the current channel of the reference transistor or reference transistors, obtained with and without a differential voltage offset added to the control voltage; an output circuit coupled to the at least one reference transistor and configured to supply a bias signal derived from the reference transistor or reference transistors to an output of the reference source.