Patent ID: 6411164
Filing Date: 2002-06-25
Classification: H03F

Abstract:
An amplifier circuit comprising:a transconductance amplifier gain stage including an operational amplifier configured as a unity gain buffer and an oatput stage having an input/output port coupled via a negative feedback path to a first, inverting input of said operational amplifier, a second, non-inverting input of said operational amplifier being coupled to a reference voltage, said input/output port being coupled through an input resistor to a signal input port; first and second current mirror circuits coupled to said output stage of said transconductance amplifier gain stage and having first and second current output ports thereof coupled to a first node, and third and fourth current output ports thereof coupled to third and fourth current mirror circuits, said third and fourth current mirror circuits having fifth and sixth current output ports thereof coupled to a second node; and an output amplifier stage from which an output is derived, said output amplifier stage having a feedback resistor coupled between an input port thereof and a signal output port; and wherein one of said first and second nodes is coupled to said input port of said output amplifier stage.