Patent ID: 7202744

Claim:
A transresistance amplifier circuit, comprising: an input terminal receiving an input current; an output terminal providing an output voltage indicative of the input current; a first bias current source providing a first bias current to the input terminal; a first transistor having a first current handling terminal coupled to the output terminal, a second current handling terminal coupled to the input terminal, and a control terminal receiving a first bias voltage; a second transistor having a first current handling terminal coupled to a first supply voltage, a second current handling terminal coupled to the output terminal, and a control terminal receiving a second bias voltage; and a biasing circuit for generating the first bias voltage for the first transistor, the first bias voltage being generated to drive the first transistor for imposing a first voltage at the input terminal, wherein the first voltage is equivalent to a selected voltage of an application circuit to which the transresistance amplifier is to be coupled and the biasing circuit generates the first bias voltage in a manner so as to allow the first voltage to track variations in the selected voltage.