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A 20-Msample/s switched-capacitor finite-impulse-response filter using a transposed structure

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3 Author(s)
B. C. Rothenberg ; Solid-State Circuits Res. Lab., California Univ., Davis, CA, USA ; S. H. Lewis ; P. J. Hurst

A programmable four-tap analog finite-impulse-response filter for use in a decision-feedback equalizer has been realized in a 2-μm double-poly CMOS process. It uses a modified transposed structure and double sampling to minimize power dissipation. Also, it uses programmable-gain sample-and-hold amplifiers with a constant feedback factor, input capacitance, and load to reduce the performance variation as a function of programming. The filter is fully differential, occupies an active area of 11.8 mm2, and dissipates 56.5 mW

Published in:

IEEE Journal of Solid-State Circuits  (Volume:30 ,  Issue: 12 )