Patent ID: 8653805

Claim:
A duty ratio/voltage conversion circuit that converts a duty ratio of an input signal into a voltage level and outputs the voltage level, the duty ratio/voltage conversion circuit comprising: an input terminal to which the input signal is input; a first CR integrating circuit that integrates the input signal from the input terminal; load means, a first end of which is directly or indirectly connected to an output point of the first CR integrating circuit, and a second end of which is grounded; and an output terminal connected to the load means, wherein the first CR integrating circuit includes a first pathway that has a first resistor, and a second pathway that has a phase inversion portion, a second resistor and a first capacitor that are connected in series, and the first CR integrating circuit is a parallel circuit in which a first end and a second end of the first pathway are connected to a first end and a second end, respectively, of the second pathway, and wherein a connecting point between the first end of the first pathway and the first end of the second pathway is connected to the input terminal, and a connecting point between the second end of the first pathway and the second end of the second pathway is the output point of the first CR integrating circuit.