Very high-frequency log-domain bandpass filters

Author

El-Gamal, Mourad N. ; Roberts, Gordon W.

Author_Institution

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

Volume

45

Issue

9

fYear

1998

fDate

9/1/1998 12:00:00 AM

Firstpage

1188

Lastpage

1198

Abstract

A transistor-level all n-p-n differential log-domain integrator geared toward low-distortion very high-frequency (VHF) applications is proposed. Systematic design steps are suggested and used to realize second and higher order balanced bandpass filters, based on the method of operational simulation of doubly-terminated LC ladders. We discuss the special sensitivity of log-domain integrators to small dc biasing offsets, practical issues in the design of the input and output interface stages, and the effect of parasitic resistors and capacitors on high-frequency log-domain filters. Experimental results from a 0.8-μm BiCMOS implementation of a single-ended 220-MHz biquad and a balanced 130-MHz fourth-order bandpass filter are reported, with emphasis on their distortion characteristics

Keywords

BiCMOS analogue integrated circuits; VHF circuits; band-pass filters; biquadratic filters; continuous time filters; electric distortion; integrating circuits; ladder filters; 0.8 micron; 130 MHz; 220 MHz; BiCMOS IC; DC bias offset; LC ladder; balanced filter; biquad filter; design; distortion; interface circuit; parasitic capacitor; parasitic resistor; simulation; transistor-level n-p-n differential log domain integrator; very high frequency log domain bandpass filter; Analog integrated circuits; Band pass filters; BiCMOS integrated circuits; Capacitors; Filtering; Microelectronics; Nonlinear distortion; Resistors; VHF circuits; Voltage;

fLanguage

English

Journal_Title

Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on

Publisher

ieee

ISSN

1057-7130

Type

jour

DOI

10.1109/82.718585

Filename

718585