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A fully differential class-AB switched-current integrator for signal processing

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2 Author(s)
Koli, K. ; Lab. of Electron. Circuit Design, Helsinki Univ. of Technol., Espoo, Finland ; Halonen, K.

A switched-current integrator is designed with a 1.2-μm CMOS process. The use of fully differential and complementary topology also enables class-AB operation in the circuit. Without sacrificing speed, the designed circuit reduces the clock-feedthrough error more than 20 dB compared to a single-transistor SI-cell. With the designed integrator, a fully differential sixth-order switched-current ladder filter with transmission zeros is realized. The designed circuit has a 10-MHz clock with an approximately 600 kHz corner frequency. The measurements show comparable performance to single-ended SC- and active-RC-filters with smaller die area and fabrication costs

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:32 ,  Issue: 2 )