Patent ID: 8200167

Claim:
A semiconductor IC comprising: a DC boost circuit, wherein the DC boost circuit includes a high-frequency input terminal, a DC control input terminal and a DC output terminal, wherein a high-frequency input signal is supplied to the high-frequency input terminal, a DC control voltage is supplied to the DC control input terminal, and a DC output voltage arises from the DC output terminal, wherein, in the DC boost circuit, the high-frequency input terminal is connected with one terminal of a series of a first capacitance element and a first resistance element connected in series, wherein first and second diodes are connected in parallel in opposite directions with a second capacitance element therebetween, wherein a common connecting point of the first and second diodes is connected with the other terminal of the series of the first capacitance and resistance elements, wherein a common connecting point of the first diode and one terminal of second capacitance element is connected with the DC control input terminal, wherein a common connecting point of the second diode and the other terminal of the second capacitance element is connected with the DC output terminal through the second resistance element, and wherein the first resistance element is set larger in resistance value than a first series resistance of the first diode and a second series resistance of the second diode in the first and second diodes connected in parallel in opposite directions with the second capacitance element therebetween.