Semiconductor integrated circuit, RF module using the same, and radio communication terminal device using the same
First Claim
1. 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, andwherein 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.
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Accused Products
Abstract
One high-frequency switch Qm supplied with transmit and receive signals to ON, and another high-frequency switch Qn supplied with a signal of another system to OFF are controlled. In the other high-frequency switch Qn, to set V-I characteristics of near-I/O gate resistances Rg1n-Rg3n of a near-I/O FET Qn1 near to a common input/output terminal I/O connected with an antenna are set to be higher in linearity than V-I characteristics of middle-portion gate resistances Rg3n and Rg4n of middle-portion FETs Qn3 and Qn4. Thus, even in case that an uneven RF leak signal is supplied to near-I/O gate resistances Rg1n-Rg3n, and middle-portion gate resistances Rg3n and Rg4n, the distortion of current flowing through the near-I/O gate resistances Rg1n-Rg3n near to the input/output terminal I/O can be reduced.
17 Citations
5 Claims
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1. A semiconductor IC comprising:
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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. - View Dependent Claims (2, 3, 4, 5)
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Specification