Polyphase filter with low-pass response

Telecommunications – Receiver or analog modulated signal frequency converter – With particular receiver circuit

Reexamination Certificate

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C455S307000, C330S107000

Reexamination Certificate

active

07031690

ABSTRACT:
A complex low-pass filter that reduces the influence of component mismatch. The filter includes a first filter section for effecting a first single pole transfer function and a second filter section for effecting a second single pole transfer function, where the first and the second single pole transfer functions collectively define a conjugate pair of poles. In higher order low-pass filters, an optimal cascade order follows a shoestring pattern.

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patent: 2004/0166803 (2004-08-01), Moloudi et al.
W. M. Snelgrove and A. S. Sedra, “State-Space Synthesis of Complex Analog Filters,” inProc. of the European Conference on Circuit Theory and Design, 1981, pp. 420-424.
A. A. Abidi, “Direct-Conversion Radio Transceivers for Digital Communications,”IEEE Journal of Solid State Circuits, vol. 30, No. 12, pp. 1399-1410 (Dec. 1995).
B. Razavi, “Design Considerations for Direct-Conversion Receivers,”IEEE Transactions on Circuits and Systems—II: Analog and Digital Signal Processing, vol. 44, No. 6, pp. 428-435 (Jun. 1997).

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