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A polyphase filter based on CMOS inverters

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2 Author(s)
Tillman, F. ; Dept. of Electroscience, Lund Univ., Sweden ; Sjoland, H.

A new idea for generation of quadrature signals on chip is presented. The topology is based on a passive RC polyphase filter, where the resistive parts are made active by using inverters. The active filter combines quadrature generation, isolation, and gain without losing quadrature performance compared to a regular RC polyphase filter. The filter technique is demonstrated in a 10GHz front-end application where a broadband VCO drives an active polyphase filter to generate quadrature LO signals. By avoiding a quadrature VCO and tuned buffers, significant reductions in chip area are possible.

Published in:

NORCHIP Conference, 2005. 23rd

Date of Conference:

21-22 Nov. 2005