Patent ID: 6917322
Filing Date: 2005-07-12
Classification: H03M

Abstract:
1. An I/V converter circuit comprising: a current mirror circuit including: a first element connected to the ground and a first node to which a current is supplied from an input terminal, and a second element connected to the ground and a second node to which the current supplied to the first node is mirrored; a first bias-current generating circuit which supplies a first bias current to the first node and which adjusts the amount of the current supplied to the first node; a first control circuit which receives the voltage of the first node and a bias voltage at the input side and which controls the first and second elements of the current mirror circuit so that the voltage of the first node is substantially equal to the bias voltage; a second bias-current generating circuit which supplies a second bias current to the second node and which adjusts the amount of the current supplied to the second node; a third element which is connected between the second node and an output terminal and which converts a current flowing therethrough to a voltage by using the bias voltage as a reference voltage; and a second control circuit which receives the voltage of the second node and the bias voltage at the input side and which controls the voltage output from the output terminal so that the voltage of the second node is substantially equal to the bias voltage.