Patent ID: 6522175
Filing Date: 2003-02-18
Classification: H03M

Abstract:
A current/voltage conversion circuitry, comprising:a current source connected to a first node; a first transistor element connected between the first node and a first potential voltage; a second transistor element which is connected between a second node and the first potential voltage, of which a control terminal is connected to that of the first transistor element, and which is of a same conductive type as the first transistor element; a first control circuit which uses a bias voltage as one of inputs thereto, and which controls voltages of the control terminals of said first and second transistor elements so that a voltage of said first node becomes substantially equal to said bias voltage; a second control circuit which uses said bias voltage as one of inputs thereto, and which controls a voltage of said second node so as to become substantially equal to that of said first node; and a resistance element, connected to the second control circuit, one end of which is connected to said second node, and which converts a current flowing through said second transistor element into a voltage.