IMPEDANCE MATCHING CIRCUIT WITH TUNABLE NOTCH FILTERS FOR POWER AMPLIFIER
First Claim
1. An apparatus comprising:
- a power amplifier configured to amplify an input radio frequency (RF) signal and provide an amplified RF signal; and
an impedance matching circuit coupled to the power amplifier and configured to match an output impedance of the power amplifier, the impedance matching circuit comprising at least one tunable notch filter configured to attenuate at least one undesired signal in the amplified RF signal.
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Accused Products
Abstract
An impedance matching circuit with at least one tunable notch filter for a power amplifier is disclosed. The power amplifier amplifies an input radio frequency (RF) signal and provides an amplified RF signal. The impedance matching circuit performs output impedance matching for the power amplifier and includes at least one tunable notch filter. Each tunable notch filter has a notch that can be varied in frequency to provide better attenuation of an undesired signal. The at least one tunable notch filter attenuates at least one undesired signal in the amplified RF signal. The at least one tunable notch filter may include (i) a first tunable notch filter to attenuate a first undesired signal at a second harmonic of the amplified RF signal and/or (ii) a second tunable notch filter to attenuate a second undesired signal at a third harmonic of the amplified RF signal.
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Citations
20 Claims
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1. An apparatus comprising:
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a power amplifier configured to amplify an input radio frequency (RF) signal and provide an amplified RF signal; and an impedance matching circuit coupled to the power amplifier and configured to match an output impedance of the power amplifier, the impedance matching circuit comprising at least one tunable notch filter configured to attenuate at least one undesired signal in the amplified RF signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method comprising:
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amplifying an input radio frequency (RF) signal with a power amplifier to obtain an amplified RF signal; impedance matching the power amplifier with an impedance matching circuit comprising at least one tunable notch filter; and attenuating at least one undesired signal in the amplified RF signal with the at least one tunable notch filter. - View Dependent Claims (16, 17)
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18. An apparatus comprising:
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means for amplifying an input radio frequency (RF) signal to obtain an amplified RF signal; means for impedance matching the means for amplifying, the means for amplifying comprising at least one tunable notch; and means for attenuating at least one undesired signal in the amplified RF signal with the at least one tunable notch. - View Dependent Claims (19, 20)
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Specification