Methods and apparatus to integrate image rejection into...

Telecommunications – Transmitter and receiver at separate stations – Frequency or phase modulation

Reexamination Certificate

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C455S063100, C455S285000, C455S302000

Reexamination Certificate

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07463862

ABSTRACT:
Methods and apparatus to integrate image rejection into quadrature mixers are disclosed. A disclosed image-rejection quadrature mixer comprises a quadrature mixer, and a cross-coupled differential pair of transistors to provide a complex filter response, wherein the mixer and the transistors are integrated on a common silicon substrate.

REFERENCES:
patent: 6975838 (2005-12-01), Rofougaran et al.
Crols et al.,Low-IF Topologies for High-Performance Analog Front Ends of Fully Integrated Receivers, IEE Transactions on Circuits and Systems-II: Analog and Digital Signal Processing, vol. 45, No. 3, Mar. 1998 (14 pages).

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