A 2.5 V, 30 MHz-100 MHz, 7th-order, equiripple group-delay continuous-time filter and variable-gain amplifier implemented in 0.25 /spl mu/m CMOS

Author

Gopinathan, V. ; Tarsla, M. ; Choi, Daniel

Author_Institution

Lucent Technol., AT&T Bell Labs., Holmdel, NJ, USA

fYear

1999

fDate

17-17 Feb. 1999

Firstpage

394

Lastpage

395

Abstract

The block-diagram of the filter and variable-gain amplifier (VGA) and their respective specs. are shown. For high-frequency applications, the two options commonly used for integrating these filters are (1) Gm-C and (2) Gm-Opamp-C structures. The Gm-C topology suffers from low DC gain and, more importantly, high sensitivity to parasitic capacitance at the output node. The Gm-Opamp-C structure chosen here, does not suffer from the forementioned problems and is modified to further improve its high-frequency characteristics.

Keywords

CMOS analogue integrated circuits; capacitance; continuous time filters; equiripple filters; operational amplifiers; 0.25 micron; 2.5 V; 30 to 100 MHz; CMOS; DC gain; Gm-Opamp-C structure; equiripple filter; group-delay continuous-time filter; high-frequency applications; parasitic capacitance; variable-gain amplifier; Capacitors; Feedback; Filters; Frequency; Linearity; Temperature; Transconductance; Transconductors; Transfer functions; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State Circuits Conference, 1999. Digest of Technical Papers. ISSCC. 1999 IEEE International

Conference_Location

San Francisco, CA

ISSN

0193-6530

Print_ISBN

0-7803-5126-6

Type

conf

DOI

10.1109/ISSCC.1999.759315

Filename

759315