Active harmonic filters for integrated radio frequency power amplifiers
AssigneeSkyworks Soultions, Inc.
InventorsOleksandr Gorbachov, Lisette L. Zhang, Lothar Musiol
Life of this patent
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Abstract
A radio frequency front end circuit includes an output signal transmission line, an amplifier circuit with an input connected to a radio frequency signal source and an output connected to the output signal transmission line. A harmonic suppression circuit is connected to the amplifier circuit, and includes an active circuit element having a frequency-dependent impedance and is tuned as a reflective trap with a negative capacitance for one or more rejection frequency ranges each corresponding to a multiple of a fundamental frequency of a signal generated by the radio frequency signal source.
Claims22
A radio frequency front end circuit comprising:
- an output signal transmission line;
- an amplifier circuit with an input connected to a radio frequency signal source and an output connected to the output signal transmission line;
- and
- a harmonic suppression circuit connected to the amplifier circuit, the harmonic suppression circuit including an active circuit element having a frequency-dependent impedance and being tuned as a reflective trap with a negative capacitance for one or more rejection frequency ranges each corresponding to a multiple of a fundamental frequency of a signal generated by the radio frequency signal source.
A radio frequency communications module comprising:
- a packaging substrate on which a plurality of components are mounted;
- an output signal transmission line disposed on the packaging substrate;
- an amplifier circuit implemented on the packaging substrate, the amplifier circuit including an input connected to a radio frequency signal source and an output connected to the output signal transmission line;
- and
- a harmonic suppression circuit implemented on the packaging substrate and connected to the amplifier circuit, the harmonic suppression circuit including an active circuit element having a frequency-dependent impedance and being tuned as a reflective trap with a negative capacitance for one or more rejection frequency ranges each corresponding to a multiple of a fundamental frequency of a signal generated by the radio frequency signal source.
A wireless communications device comprising:
- an antenna receptive to an incoming radio frequency signal and transmissive of an outgoing radio frequency signal;
- an output transmission line connectable to the antenna;
- a radio frequency amplifier circuit connected to the antenna;
- and
- a harmonic suppression circuit connected to the amplifier circuit, the harmonic suppression circuit including an active circuit element having a frequency-dependent impedance and being tuned as a reflective trap with a negative capacitance for one or more rejection frequency ranges each corresponding to a multiple of a fundamental frequency of a signal generated by a radio frequency signal source.
Dependencies are inferred from the claim text.