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Double-Capacitor Technique for Wide Frequency Range Phase Compensation in Gm-C and MOSFET-C Filters
Phanumas KHUMSAT Apisak WORAPISHET Wanlop SURAKAMPONTORN
IEICE TRANSACTIONS on Electronics
Publication Date: 2009/01/01
Online ISSN: 1745-1353
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Electronic Circuits
Gm-C filter, MOSFET-C filter, phase compensation, phase error, capacitive peaking,
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A double-capacitor phase error compensation configuration is proposed for Gm-C and MOSFET-C filters. The use of two capacitors enables the effective compensation capacitance to track with the tuning resistance, thereby making it more effective over a wider frequency tuning range as compared to the conventional single-capacitor configuration. Simulations of 5th-order Chebyshev filters in a 0.18 µm CMOS process with more than one octave tuning range were carried out to demonstrate the viability of the proposed double-capacitor configuration for both Gm-C and MOSFET-C filters.