Patent ID: 7382174
Filing Date: 2008-06-03
Classification: H03F

Abstract:
1. A transconductor for automatically selecting a non-linear class A operation or a linear class AB operation based on in response to a value of an input signal to be processed to generate an output signal, and for automatically adjusting current from a power supply to a level needed for operation of the transconductor, the transconductor comprising: at least two bipolar transistors, common bases of which define a first input/output terminal of the transconductor; interconnected collectors of the at least two bipolar transistors which define a second input/output terminal of the transconductor; emitters of the at least two bipolar transistors, each of the emitters is individually connected to a low voltage reference line by a respective impedance; and the bases of the at least two bipolar transistors which are connected to a same D.C. current source.