Matching circuit including a MEMS capacitor
First Claim
1. A matching circuit for adapting a radio-frequency amplifier to load impedance at various output power levels of the radio-frequency amplifier, the matching circuit being common for all power levels and the matching circuit comprising an interface for receiving power level control signals which determine capacitance of one or more capacitors, andat least one matching circuit capacitor is a microelectromechanical (MEMS) capacitor whose capacitance the power level control signals adjust for the radio-frequency amplifier to operate optimally at a selected frequency at any particular power level and thus making the radio-frequency amplifier operate optimally in the whole desired power range.
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Accused Products
Abstract
The invention relates to a matching circuit for adapting an amplifier to load impedance at various output power levels of the amplifier, and a method for adapting the amplifier to load impedance at various output power levels of the amplifier. The matching circuit comprises an LC circuit, i.e. an electric circuit switching consisting of at least one coil and at least one capacitor for tuning harmonic signals resulting from amplifier non-linearities. At least one capacitor of the LC circuit (600, 602, 604, 606) is an adjustable microelectromechanical (MEMS) capacitor (602, 606). The LC circuit comprises an interface for receiving control signals (220) adjusting capacitance of the microelectromechanical (MEMS) capacitor. The control signals (220) adjust the capacitance of the microelectromechanical (MEMS) capacitor (602, 606) such that the LC circuit (600, 602, 604, 606) resonates at the frequency of the harmonic signal to be tuned.
66 Citations
22 Claims
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1. A matching circuit for adapting a radio-frequency amplifier to load impedance at various output power levels of the radio-frequency amplifier, the matching circuit being common for all power levels and the matching circuit comprising an interface for receiving power level control signals which determine capacitance of one or more capacitors, and
at least one matching circuit capacitor is a microelectromechanical (MEMS) capacitor whose capacitance the power level control signals adjust for the radio-frequency amplifier to operate optimally at a selected frequency at any particular power level and thus making the radio-frequency amplifier operate optimally in the whole desired power range.
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11. A method for adapting a radio-frequency amplifier to load impedance with a matching circuit at various output power levels of the radio-frequency amplifier, the matching circuit being common for all power levels and the matching circuit comprising one or more LC circuits, i.e. an electric circuit switching including at least one coil and at least one capacitor for tuning harmonic signals resulting from amplifier non-linearities, comprising
tuning harmonic signals by an LC circuit which comprises at least one adjustable microelectromechanical (MEMS) capacitor, receiving power level control signals adjusting capacitance of the microelectromechanical (MEMS) capacitor through an interface in the LC circuit, adjusting the capacitance of the microelectromechanical (MEMS) capacitor by at least one power level control signal such that the LC circuit resonates at the frequency of the harmonic signal to be tuned.
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12. A method for adapting a radio-frequency amplifier to load impedance with a matching circuit at various output power levels of the radio-frequency amplifier, the matching circuit being common for all power levels and the matching circuit comprising an interface for receiving power level control signals which determine capacitance of one or more capacitors, comprising
adjusting the capacitance of at least one microelectromechanical (MEMS) capacitor of the matching circuit such that the radio-frequency amplifier operates optimally in a broad output power level range.
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22. A matching circuit for adapting a radio-frequency amplifier to load impedance at various output power levels of the radio-frequency amplifier, the matching circuit being common for all power levels and the matching circuit comprising one or more LC circuits, i.e. an electric circuit switching including at least one coil and at least one capacitor for tuning harmonic signals resulting from amplifier non-linearities, wherein
at least one capacitor of the LC circuit is an adjustable microelectromechanical (MEMS) capacitor, the LC circuit comprises an interface for receiving power level control signals adjusting the capacitance of the microelectromechanical (MEMS) capacitor, the power level control signal adjusts the capacitance of the microelectromechanical (MEMS) capacitor such that the LC circuit resonates at the frequency of the harmonic signal to be tuned.
Specification