Downconversion mixer with IM2 cancellation

Details Downconversion mixer with IM2 cancellation Downconversion mixer with IM2 cancellation

2005-08-30

2011-11-01

Rego, Dominic E (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S333000, C455S189100, C455S190100, C455S209000, C327S359000

Reexamination Certificate

active

08050649

ABSTRACT:
A downconversion mixer with IM2 cancellation includes a mixer, an IM2 generator, and a scaling unit. The mixer frequency downconverts an input RF signal with an LO signal and generates an output baseband signal. The IM2 generator includes first and second field effect transistors (FETs) that receive the input RF signal and generate an intermediate signal having IM2 distortion. The scaling unit scales the intermediate signal to generate a scaled signal and further combines the scaled signal with the output baseband signal to cancel IM2 distortion in the output baseband signal. The IM2 generator may further include first and second amplifiers coupled between the source and gate of the first and second FETs, respectively. Different amounts of IM2 distortion and different temperature variation patterns may be generated in the intermediate signal by using different gains for the amplifiers.

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International Search Report and Written Opinion—PCT/US2006/033936, International Search Authority— European Patent Office—Dec. 22, 2006.

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