Compact sub-hertz OTA-C filter design with interface-trap charge pump

被引：11

作者：

Becker-Gómez, A ^{[1
]}

Çilingiroglu, U ^{[1
]}

Silva-Martínez, J ^{[1
]}

机构：

[1] Texas A&M Univ, Dept Elect Engn, College Stn, TX 77843 USA

来源：

IEEE JOURNAL OF SOLID-STATE CIRCUITS | 2003年 / 38卷 / 06期

关键词：

charge pumping; CMOS transconductors; interface traps; OTA-C filters; ultralow frequency;

D O I：

10.1109/JSSC.2003.811981

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：

Single-ended and differential operational transconductance amplifier (OTA) configurations are biased with MOSFET interface-trap charge-pumping (ITCP) current generators to achieve very low transconductances for tunable sub-hertz operational transconductance amplifier-capacitor (OTA-C) filter implementation. This paper reviews the basics of ITCP current generation and presents the transconductors and the OTA-C filter configurations based on these transconductors. One of the filters is a low-pass with an experimentally determined lowest cutoff frequency of 0.18 Hz, and the other is a fully differential bandpass with individually tunable lower and upper cutoff frequencies measured down to 0.3 Hz. The former has one 15-pF filter capacitor, and measures 0.0346 mm, whereas the latter contains four such capacitors and occupies 0.188 mm(2) silicon. Experimental evaluation also includes offset, harmonic distortion, and noise performance.

引用

页码：929 / 934

页数：6

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