Very high-frequency log-domain bandpass filters

被引：22
|
作者：
El-Gamal, MN [1 ]
Roberts, GW [1 ]
机构：
[1] McGill Univ, Microelect & Comp Syst Lab, Montreal, PQ H3A 2A7, Canada
来源：
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-ANALOG AND DIGITAL SIGNAL PROCESSING | 1998年 / 45卷 / 09期
基金：
加拿大自然科学与工程研究理事会;
关键词：
analog integrated circuits; companding; continuous-time filters; current-mode circuits; log-domain; nonlinear circuits; tunable filters; VHF filters;
D O I：
10.1109/82.718585
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
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 de 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-mu m 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.
引用
收藏
页码：1188 / 1198
页数：11
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