A micropower class-AB CMOS log-domain filter for DECT applications

被引：42
|
作者：
Python, D [1 ]
Enz, CC
机构：
[1] Ukom Inc, San Jose, CA 95110 USA
[2] CSEM, CH-2007 Neuchatel, Switzerland
来源：
IEEE JOURNAL OF SOLID-STATE CIRCUITS | 2001年 / 36卷 / 07期
关键词：
D O I：
10.1109/4.933462
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：
This paper presents a micropower second-order low-pass filter using the log-domain principle and integrated in a 0.35-mum CMOS process. It has been designed as an antialiasing filter for a DECT transceiver with a 45-kHz nominal cutoff frequency. The circuit uses transistors biased in weak inversion without requiring separate wells. It operates at 1.5-V supply voltage and its current consumption is 8 muA in idle mode. The log-domain filter is implemented with an on-chip conditioner which allows class-AB operation. It can process input currents at 5 kHz that are 25 times larger than the 200-nA bias current, Measurements up to 500 times the bias current have been done, since at 1 kHz the input current is only limited by the supply voltage.
引用
收藏
页码：1067 / 1075
页数：9
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