Impedance-matched IQ network for an image rejection circuit

Details Impedance-matched IQ network for an image rejection circuit Impedance-matched IQ network for an image rejection circuit

2008-05-06

2008-05-06

Maung, Nay (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C455S139000, C455S138000, C455S137000, C455S304000, C455S296000, C333S032000

Reexamination Certificate

active

07369834

ABSTRACT:
An impedance-matched IQ network includes a phase shift circuit and a back termination. The phase shift circuit includes an in-phase mixer port for receiving the in-phase signal, a quadrature-phase mixer port for receiving the quadrature phase signal, a termination port, and an output port. The back termination is coupled to the termination port of the phase shift circuit, the back termination having an impedance value substantially equal to the characteristic impedance of the phase shift circuit at the termination port.

REFERENCES:
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patent: 6727771 (2004-04-01), Moribe et al.
patent: 6862442 (2005-03-01), Sanada et al.
patent: 6980787 (2005-12-01), Dujmenovic
patent: 6983129 (2006-01-01), Satoh et al.
patent: 6985698 (2006-01-01), Aggarwal et al.
Gingell, “The Synthesis and Application of Polyphase Filters with Sequence Asymmetric Properties,” Ph.D Thesis, 1975, Univ. of London Faculty of Engineering.

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