Balanced log-domain filters for VHF applications

Author

El-Gamal, Mourad ; Leung, Vincent ; Roberts, Gordon W.

Author_Institution

Microelectron. & Comput. Syst. Lab., McGill Univ., Montreal, Que., Canada

Volume

1

fYear

1997

fDate

9-12 Jun 1997

Firstpage

493

Abstract

General transfer characteristics of log-domain integrators necessary to realize different log-domain filter topologies, based on LC ladder synthesis, are described. As an example, a transistor-level all-NPN differential log-domain integrator is proposed and used to implement a fully tunable balanced 600 MHz biquad. The integrator is then used to implement 4^th and 6^th-order balanced bandpass filters. The sensitivity of log-domain integrators to DC biasing offsets is discussed. These offsets are minimized using a BiCMOS common mode feedback circuit. Simulation results are presented with an emphasis on distortion analysis

Keywords

BiCMOS analogue integrated circuits; VHF filters; band-pass filters; biquadratic filters; circuit feedback; circuit tuning; integrating circuits; ladder filters; 600 MHz; BiCMOS common mode feedback circuit; DC biasing offsets; LC ladder synthesis; VHF applications; balanced bandpass filters; balanced log-domain filters; distortion analysis; fully tunable biquad; log-domain integrators; transfer characteristics; transistor-level all-NPN differential integrator; Application software; Band pass filters; Equations; Filtering; Frequency; Laboratories; Microelectronics; Nonlinear filters; Tunable circuits and devices; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1997. ISCAS '97., Proceedings of 1997 IEEE International Symposium on

Print_ISBN

0-7803-3583-X

Type

conf

DOI

10.1109/ISCAS.1997.608780

Filename

608780