Low input resistance current buffer stage using a controllable positive feedback loop,and applications of current conveyor based filters |
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| Affiliation: | Faculty of Electrical and Electronics Engineering, Department of Electronics and Communication Engineering, Istanbul Technical University, 34469 Maslak, Istanbul, Turkey;Department of Electronics and Telecommunication, R. C. Patel Institute of Technology, Shirpur, Maharashtra, India;Pamukkale University, Department of Electrical and Electronics Engineering, 20160 Kinikli, Denizli, Turkey;University of Patras, Physics Department, Electronics Laboratory, GR-26504 Rio Patras, Greece;School of Electronic Engineering, Beijing Key Laboratory of Work Safety Intelligent Monitoring, Beijing University of Posts and Telecommunications, Beijing 100876, China;Department of Electronics and Communication, Maulana Azad National Institute of Technology, Bhopal, MP, 462003, India;Department of Electronics and Telecommunication Engineering, Faculty of Engineering, Rajamangala University of Technology Isan, Khonkaen Campus, Khonkaen 40000, Thailand |
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| Abstract: | A novel current buffer stage with very low input resistance is proposed. Low input resistance is achieved using a potentially instable positive feedback loop. Stability of the circuit under different operating conditions is examined in details. A feedback control block using a bipolar 4-bit current steering DAC as a control mechanism is added to the buffer to control the input resistance and assure stability. The proposed technology-independent design methodology always ensures precision and stability for all different parasitic capacitor and resistor values of the driving signal source as well as for process, mismatch, and environmental variations. Additionally, a novel second generation current conveyor circuit based on this novel input buffer is presented to demonstrate how this buffer makes almost ideal current mode circuits possible. Filter applications using the proposed CCII are performed for further justification. The current buffer and CCII were built in AMS 0.35 μm 2P4M CMOS technology. Measurement results are presented for the current buffer, the CCII circuit, and the filters. |
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