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

Author

Bollati, Giacomino ; Marchese, Stefano ; Demicheli, Marco ; Castello, Rinaldo

Author_Institution

STMicroelectronics, Cornaredo, Italy

Volume

36

Issue

7

fYear

2001

fDate

7/1/2001 12:00:00 AM

Firstpage

1056

Lastpage

1066

Abstract

A CMOS low-pass filter with programmable boost is presented. The architecture is a G_m/C type with the G_m 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 mV_pp 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 f_c=120 MHz and has a die area of 0.23 mm²

Keywords

CMOS analogue integrated circuits; biquadratic filters; cascade networks; circuit tuning; continuous time filters; low-pass filters; programmable filters; transfer functions; 120 mW; 2.5 V; 30 to 120 MHz; CMOS implementation; G_m/C type architecture; HDD equalisation; biquad and first-order cells cascade; degenerated differential pair; dual-loop control; eighth-order CMOS low-pass filter; high-frequency boost; linear phase filters; optimised transfer function; programmable boost; resistor servo approach; transconductors; tuning range; CMOS technology; Circuits; Digital filters; Dynamic range; Low pass filters; Nonlinear filters; Resistors; Transconductors; Transfer functions; Voltage;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.933461

Filename

933461