Tunable Impedance Matching Circuit
First Claim
1. A tunable impedance matching circuit adjusting an impedance of an input or output of an external circuit, comprising:
- a first inductor for conducting a current of the external circuit;
a capacitor unit connected to the first inductor;
a second inductor magnetically coupled with the first inductor, for conducting a control current with a certain phase and amplitude relative to the current of the external circuit; and
a control circuit for applying the control current to the second inductor and changing the impedance of the first inductor magnetically coupled with the second inductor by changing either or both of the phase and amplitude of the control current.
1 Assignment
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Accused Products
Abstract
The tunable impedance circuit comprises capacitors C1 and C2, an inductor L1, and an inductor L2 magnetically coupled with the inductor L1. The control current Icontrol with variable phase and amplitude from the control circuit 13 flows in the inductor L2. The impedance of the inductor L1 is changed by changing the phase and amplitude of the control current Icontrol. The output impedance is set to an optimum level by setting an effective inductance and an effective quality factor of the tunable impedance circuit 12a to be optimum by means of the phase and amplitude of the control current Icontrol relative to output current IRF of RF PA 11.
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Citations
9 Claims
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1. A tunable impedance matching circuit adjusting an impedance of an input or output of an external circuit, comprising:
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a first inductor for conducting a current of the external circuit; a capacitor unit connected to the first inductor; a second inductor magnetically coupled with the first inductor, for conducting a control current with a certain phase and amplitude relative to the current of the external circuit; and a control circuit for applying the control current to the second inductor and changing the impedance of the first inductor magnetically coupled with the second inductor by changing either or both of the phase and amplitude of the control current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification