Harmonic circuit for improving linearity

Details Harmonic circuit for improving linearity Harmonic circuit for improving linearity

2006-09-05

2006-09-05

Vuong, Quochien B. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Modulation distortion or cross talk correction or elimination

C455S067130, C455S296000

Reexamination Certificate

active

07103341

ABSTRACT:
The present invention relates to a harmonic circuit for improving linearity, the harmonic circuit according to the present invention comprises a first terminal connected to a collector of a NPN transistor and a second terminal connected to an emitter of the NPN transistor, and removes inter-modulation noise from the signal appeared at the collector of the NPN transistor. The harmonic circuit includes a PNP transistor, a first resistor, and a second resistor. The PNP transistor generates harmonic components without affecting the main signal, and the harmonic components that are generated by the PNP transistor compensate the harmonic components that are generated by the NPN transistor by having load of different sign from the load of the harmonic components that are generated by the NPN transistor. In addition, the harmonic circuit further includes a phase shifter to compensate the phase distortion that is generated from non-linear devices, and it can reduce the inter-modulation noise more minutely by implementing the PNP transistor using a plurality of Darlington-connected PNP transistors.

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patent: 2004/0008082 (2004-01-01), Dow

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