Double-Capacitor Technique for Wide Frequency Range Phase Compensation in Gm-C and MOSFET-C Filters

Phanumas KHUMSAT  Apisak WORAPISHET  Wanlop SURAKAMPONTORN  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E92-C   No.1   pp.178-182
Publication Date: 2009/01/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E92.C.178
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Electronic Circuits
Keyword: 
Gm-C filter,  MOSFET-C filter,  phase compensation,  phase error,  capacitive peaking,  

Full Text: PDF(749.9KB)>>
Buy this Article




Summary: 
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.