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An eighth-order CMOS low-pass filter with 30-120 MHz tuning range and programmable boost

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4 Author(s)
Bollati, G. ; STMicroelectronics, Cornaredo, Italy ; Marchese, S. ; Demicheli, M. ; Castello, R.

A CMOS low-pass filter with programmable boost is presented. The architecture is a Gm/C type with the Gm value controlled through a resistor servo approach. The transfer function has been optimized in order to reduce the sensitivity to component parameter variations. The 1:4 tuning range is achieved by exploiting a dual-loop control over a degenerated differential pair. At the nominal output voltage swing of 200 mVpp differential, a THD better than 40 dB is guaranteed. The high-frequency boost is programmable between 6 and 14 dB. This filter, realized as a cascade of biquad and first-order cells, is implemented in a 0.25-μm 2.5-V CMOS technology. It dissipates 120 mW with fc=120 MHz and has a die area of 0.23 mm2

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:36 ,  Issue: 7 )