Parallel-structured switched variable inductor circuit
First Claim
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1. A mobile communication device comprising a circuit, the circuit comprising:
- a first inductor;
a first resistor connected in series with the first inductor;
a second inductor;
a second resistor connected in series with the second inductor; and
a metal oxide field effect transistor which electrically connects the second inductor and the second resistor with the first inductor and the first resistor in parallel when the metal oxide field effect transistor is turned on,wherein the first resistor and the second resistor have a same resistance value and,wherein the circuit changes a resonance frequency by connecting and disconnecting the first and second inductors through the metal oxide field effect transistor to generate an operation frequency of the circuit, but does not use a capacitor to change the resonance frequency to generate the operating frequency.
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Abstract
An inductor circuit includes a pair of inductors connected in parallel with each other and a switch for turning on and off electric power to one of the pair of inductors. The inductance of the inductor circuit can be varied and the quality factor Q can be improved. Further, RF circuits employing the inductor circuit can generate an intended operating frequency.
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Citations
18 Claims
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1. A mobile communication device comprising a circuit, the circuit comprising:
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a first inductor; a first resistor connected in series with the first inductor; a second inductor; a second resistor connected in series with the second inductor; and a metal oxide field effect transistor which electrically connects the second inductor and the second resistor with the first inductor and the first resistor in parallel when the metal oxide field effect transistor is turned on, wherein the first resistor and the second resistor have a same resistance value and, wherein the circuit changes a resonance frequency by connecting and disconnecting the first and second inductors through the metal oxide field effect transistor to generate an operation frequency of the circuit, but does not use a capacitor to change the resonance frequency to generate the operating frequency. - View Dependent Claims (2, 5, 6, 7, 8, 9, 10, 11)
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3. A radio-frequency (RF) circuit, comprising:
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a first inductor; a first resistor connected in series with the first inductor; a second inductor; a second resistor connected in series with the second inductor; and a metal oxide field effect transistor which electrically connects the second inductor and the second resistor with the first inductor and the first resistor in parallel when the metal oxide field effect transistor is turned on, wherein the first resistor and the second resistor have a same resistance value, and wherein the circuit changes a resonance frequency by connecting and disconnecting the first and second inductors trough the metal oxide field effect transistor to generate an operation frequency of the circuit, but does not use a capacitor to change the resonance frequency to generate the operating frequency. - View Dependent Claims (4, 12, 13, 14, 15, 16, 17, 18)
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Specification