Current voltage conversion circuit

Abstract

To provide a current voltage conversion circuit capable of increasing a variable range when a bias voltage is applied in particularly, the current voltage conversion circuit having a small input-converted noise current density or input-converted noise voltage density.SOLUTION: The present invention provides a current voltage conversion circuit, in which a first-stage amplification circuit includes a first amplification element and a second amplification element, a current input terminal of the current-voltage conversion circuit is connected to a control terminal of the first amplification element, and a bias voltage input terminal of the current voltage conversion circuit is connected to a control terminal of the second amplification element directly or via a resistance element. By applying a voltage following the voltage of any of the bias voltage input terminal, the control terminal of the first amplification element, and the control terminal of the second amplification element to the first main terminal of the first amplification element and the second amplification element, respectively, the voltage between the first main terminal and a second main terminal of the first amplification element and the second amplification element is made substantially constant regardless of the voltage of the bias voltage input terminal, and a voltage range that can be applied to the bias voltage input terminal is widened.SELECTED DRAWING: Figure 8

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