Patent ID: 8335479

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 of the DC boost circuit, and a DC control voltage is supplied to the DC control input terminal, whereby a DC output voltage arises from the DC output terminal, wherein the DC boost circuit includes a first capacitance element, a second capacitance element, a first diode, a second diode, a first resistance element and a second resistance element, wherein the high-frequency input terminal is connected with one terminal of a series of the first capacitance and resistance elements connected in series, wherein the other terminal of the series of the first capacitance and resistance elements is connected with a cathode of the first diode and an anode of the second diode, wherein an anode of the first diode and one terminal of the second capacitance element are connected with the DC control input terminal, wherein a cathode of the second diode and the other terminal of the second capacitance element are connected with one terminal of the second resistance element, wherein the other terminal of the second resistance element is connected with the DC output terminal, 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 a closed loop including the first and second diodes and second capacitance element.