Patent ID: 7102437
Filing Date: 2006-09-05
Classification: H03D,H03F

Abstract:
1. An integrated circuit device including an amplifier stage which comprises: a d.c. output current path including the second and third electrodes of at least a first transistor having first, second and third electrodes; a further transistor which is paired with the first transistor by having its first and second electrodes connected respectively to the first and second electrodes of the first transistor; and a biasing circuit arrangement operable with bias control feedback to determine a biasing level which sets the direct currents in the output current path and the said further transistor, which arrangement includes an input connected to sense the direct current at the third electrode of the said further transistor whereby the said biasing level is adjustable in response to the sensed current; wherein the third electrodes of the transistors are capacitively coupled together.