A novel ±0.8 V high-performance voltage-tunable CDTA with enhanced bandwidth. Issue 4 (2nd April 2016)

• Record Type: Journal Article
• Authors: Xia, Zanming; Wang, Chunhua; Kuang, Jun; Jin, Jie
• Is Part Of: International journal of electronics. Volume 103:Issue 4(2016)
• Page Start: 704
• Page End: 721
• Publication Date: 2016-04-02
• Subjects: CDTA -- low voltage -- bandwidth enhancement -- linear-tunable -- noise; Electronics -- Periodicals; Electronic control -- Periodicals; 621.381
• DOI: 10.1080/00207217.2015.1036813
• Languages: English
• ISSNs: 0020-7217

Abstract

Abstract : In this article, we propose a novel high-performance complementary metal oxide semiconductor (CMOS) current differencing transconductance amplifier (CDTA) with a transconductance gain ( G M ) that can be linearly tuned by a voltage. By using a high-speed, low-voltage, cascaded current mirror active resistance compensation technique, the proposed CDTA circuit exhibits wide frequency bandwidths, high current tracking precisions as well as large output impedances. The linear-tunable G M of the CDTA is designed with the use of linear composite metal oxide semiconductor field-effect transistor as basic cells in the circuit. Combining these two approaches, several design concerns are studied, including: impedance characteristic, tracking errors, offset and linearity and noise. The prototype chip with a 0.25 mm 2 area is fabricated in a GlobalFoundries'0.18 μm CMOS process. The simulated results and measured results with ±0.8 V DC supply voltages are presented, and show extremely wide bandwidths and wide linear tuning range. In addition, a fully differential band-pass filter for a high-speed system is also given as an example to confirm the high performance of the proposed circuit.