Impedance circuit, and filter circuit, amplifier circuit, semiconductor integrated circuit, electronic component, and wireless communications device using the same
First Claim
1. An impedance circuit, comprising:
- a first impedance element having at least one inductor;
a second impedance element having at least one capacitor;
a first switch and a second switch; and
a first terminal and a second terminal used to establish an outside connection, wherein;
one end of said first impedance element and one end of said second impedance element are connected to said first terminal;
the other end of said first impedance element is connected to said first switch;
the other end of said second impedance element is connected to said second switch; and
one of said first switch and said second switch is connected to said second terminal and the other is connected to ground.
1 Assignment
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Accused Products
Abstract
A filter circuit is provided wherein one end of an inductor is connected to one end of a capacitor to form a signal input end. The other end of the inductor is connected to a first switch circuit, and the other end of the capacitor is connected to a second switch circuit. When a lower-frequency signal in a 2.4 GHz band is to be inputted, a low-pass filter circuit is formed by connecting the other end of the inductor to a signal output end and the other end of the capacitor to ground, and when a higher-frequency signal in a 5 GHz band is to be inputted, a high-pass filter circuit is formed by connecting the other end of the inductor to ground and the other end of the capacitor to the signal output end, by manipulating the first and second switch circuits.
75 Citations
15 Claims
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1. An impedance circuit, comprising:
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a first impedance element having at least one inductor;
a second impedance element having at least one capacitor;
a first switch and a second switch; and
a first terminal and a second terminal used to establish an outside connection, wherein;
one end of said first impedance element and one end of said second impedance element are connected to said first terminal;
the other end of said first impedance element is connected to said first switch;
the other end of said second impedance element is connected to said second switch; and
one of said first switch and said second switch is connected to said second terminal and the other is connected to ground. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification