Miscellaneous active electrical nonlinear devices – circuits – and – Specific input to output function – Combining of plural signals
Reexamination Certificate
2005-05-10
2005-05-10
Ton, My-Trang Nu (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific input to output function
Combining of plural signals
Reexamination Certificate
active
06891423
ABSTRACT:
A quadrature switching mixer is provided for mixing a received RF signal and a local oscillator signal, while rejecting an image signal associated with the RF signal. Input signal components in quadrature, that is, I and Q input components derived from the received RF signal, are respectively coupled through first and second input paths to corresponding commuting switches in a configuration of switches. Each of the switches operates to multiply respective quadrature components of RF and local oscillator signals to provide quadrature output signal components. A unidirectional device, such as a buffer amplifier included in a signal splitter, is placed in each input path to prevent any portion of an output signal component from leaking backward through one of the input paths to the other input path, and thus to the other output signal component.
REFERENCES:
patent: 5155724 (1992-10-01), Edwards
patent: 5410743 (1995-04-01), Seely et al.
patent: 6026287 (2000-02-01), Puechberty et al.
patent: 6124761 (2000-09-01), Robinson et al.
patent: 6226509 (2001-05-01), Mole et al.
patent: 6417712 (2002-07-01), Beards et al.
patent: 20010027095 (2001-10-01), Wang
patent: 20010036818 (2001-11-01), Dobrovotny
patent: 195-23-433 (1997-01-01), None
patent: 198-19-092 (1999-11-01), None
patent: 1 137 168 (2001-09-01), None
patent: 2 249 679 (1992-05-01), None
patent: 2 341 502 (2000-03-01), None
Wiklund, et al, “A 2Ghz Image-Reject Receiver in a Low IF Architecture Fabricated in a 0.1 μm CMOS Technology”; Apr. 4, 2002, Lund, Sweden.
Abidi, A., “CMOS Wireless Transceivers: The New Wave”, IEEE Communications Magazine, Aug. 1, 1999, vol. 37, No. 8, (pp. 119-124).
Butler, N., International Search Report completed by European Patent Office on Nov. 27, 2003 (7 pages).
Björk Christian
Mattisson Sven
Wiklund Magnus
Jenkens & Gilchrist P.C.
Nu Ton My-Trang
Telefonaktiebolaget LM Ericsson (Publ)
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