Performance comparison of high-order IFLF and cascade analogue integrated lowpass filters

Author

Chiang, D.H. ; Schaumann, R.

Author_Institution

Storage Prods. Group, Texas Instrum. Inc., Tustin, TX, USA

Volume

147

Issue

1

fYear

2000

fDate

2/1/2000 12:00:00 AM

Firstpage

19

Lastpage

27

Abstract

The magnitude and delay performance of integrated continuous-time g_m-C lowpass filters is discussed. The analysis is based on tenth-order filters with equiripple group delay, implemented in CMOS fully differential form as inverse-follow-the-leader feedback (IFLF) and cascade topologies. A very-high-frequency operational transconductance amplifier (OTA) is used as the basic building block. The sensitivity performance is assessed by simulating IFLF and cascade filters with 27 real CMOS models released from MOSIS. Experimental and simulation results show that the passband magnitude sensitivity of the cascade filter is larger than that of the IFLF filter. In the stopband, the opposite is true. The results demonstrate that the group delay performance, on the other hand, is worse in the IFLF filter than in the cascade filter

Keywords

CMOS analogue integrated circuits; cascade networks; circuit feedback; continuous time filters; delays; integrated circuit design; linear network analysis; linear network synthesis; low-pass filters; operational amplifiers; sensitivity analysis; CMOS fully differential form; IFLF filter; VHF OTA; active filters; cascade analogue integrated lowpass filters; cascade topology; continuous-time g_m-C filters; delay performance; equiripple group delay; high-order filters; inverse-follow-the-leader feedback topology; magnitude performance; operational transconductance amplifier; passband magnitude sensitivity; performance comparison; sensitivity performance; tenth-order filters;

fLanguage

English

Journal_Title

Circuits, Devices and Systems, IEE Proceedings -

Publisher

iet

ISSN

1350-2409

Type

jour

DOI

10.1049/ip-cds:20000057

Filename

836507