Patent ID: 6150885
Filing Date: 2000-11-21
Classification: H03F

Abstract:
A transconductance amplifier, comprising:first and second current sources coupled to a more positive rail;first and second input transistors, each input transistor coupled between a current source and a less positive rail, the input transistors having respective first terminals coupled to the current sources and second terminals for receiving a differential input voltage signal thereon;an impedance coupled between respective third terminals of the first and second input transistors;third and fourth transistors having a respective first terminals coupled to respective third terminals of the first and second transistors, respective second terminals coupled to the less positive rail, and respective third terminals coupled to a feedback circuit coupled to the first terminal of respective first and second transistors;first and second current mirror transistors having a respective terminal coupled to the third terminal of the third and fourth transistors, each of the first and second current mirror transistors also having another terminal at which an output from the transconductor amplifier is presented; andfirst and second low pass filters, the first low pass filter coupled between the third terminal of the third transistor and the first current mirror transistor, the second low pass filter coupled between the third terminal of the fourth transistor and the second current mirror transistor.