Copyright © 2008 The Institute of Electronics, Information and Communication Engineers
Special Section on Analog Circuits and Related SoC Integration Technologies - Papers |
A Very Wideband Active RC Polyphase Filter with Minimum Element Value Spread Using Fully Balanced OTA Based on CMOS Inverters
1 The authors are with the Department of Electrical and Electronic Engineering, Kitami Institute of Technology, Kitami-shi, 090-8507 Japan. E-mail: tanimoto{at}elec.kitami-it.ac.jp, 2 Presently, with the FUJITSU VLSI LIMITED., 3 Presently, with the Panasonic Semiconductor Systems and Technology Co.
This paper presents a very wideband active RC polyphase filter (ARCPF). We propose a unit section of the ARCPF, which is an ordinary RCPF followed by opamps with parallel RC feedback. In the proposed unit section, pole and zero can be assigned independently. By using the unit ARCPFs, a very wideband image rejection filter can be realized by cascading the sections, which can greatly reduce the element value spread. To realize this, CMOS inverter based fully differential OTA which can operate under low supply voltage is also presented. This paper describes a six-stage active RC polyphase filter with 1–100 MHz passband in 0.18 µm CMOS technology.
Key Words: active RC polyphase filter, fully differential OTA, CMOS inverter, wideband, element value spread
Manuscript received October 17, 2007. Manuscript revised December 19, 2007.
References
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