Universal Current-Mode Filters Based on OTA and MO-CCCA

Abstract

In this paper, a new universal current-mode filtering circuit with single input and multi-outputs based on OTAs (operational transconductance amplifiers) is proposed. The circuit just consists of two operational transconductance amplifiers, one current controlled current amplifier with multi-outputs (MO-CCCA), and two grounded capacitors. It can realize low-pass, band-pass, high-pass, band-stop, and all-pass filters simultaneously. Its quality factor and natural frequency can be tuned independently and the sensitivities are very low. Moreover, the non-ideal characteristic of the proposed filter is analysed and simulated by PSPICE.

KEYWORDS:

• Current-mode circuit
• Filter
• Operational transconductance amplifier

ACKNOWLEDGEMENT

Authors thank the anonymous reviewers for their contribution to the improvements of this paper.

DISCLOSURE STATEMENT

No potential conflict of interest was reported by the authors.

Additional information

Funding

The authors would like to thank the National Natural Science Foundation of China [grant number 61571185]; Natural Science Foundation of Hunan Province, China [grant number 2016JJ2030]; Open Fund Project of Key Laboratory in Hunan Universities, China [grant number 15K027].

Notes on contributors

Yi Li

Yi Li was born in Taoyuan, China, in 1975. He is currently studying in Hunan University for the PhD degree. His research areas are focused on RF circuits and analogue IC circuit design.

E-mail: [email protected]

Chunhua Wang

Chunhua Wang was born in Yongzhou, China, in 1963. He received the PhD degree from Beijing University of Technology, Beijing, China. He is currently a professor of Hunan University, Changsha, China. His research includes current-mode circuit design and RFIC design. He is the corresponding author.

E-mail: [email protected]

Baihui Zhu

Baihui Zhu received the BS degree in 2014. He is currently studying in Hunan University for master degree. His research areas are mainly in analogue IC circuit and current-mode filter design.

E-mail: [email protected]

Zhenhua Hu

Zhenhua Hu was born in Chenzhou, China, in 1980. He is currently studying in Hunan University for the PhD degree. His research interests are mainly in wireless communication circuit, ultra-low power, and ultra-wideband RFIC design.

E-mail: [email protected]