Papers Submitted to WSEAS Conferences and WSEAS Journals: Wseas Transactions

Tuesday, 30 December 2008

Wseas Transactions

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Transactions: WSEAS TRANSACTIONS ON ELECTRONICS
Transactions ID Number: 28-754
Full Name: Nikolaos Charalampidis
Position: Lecturer
Age: ON
Sex: Male
Address: Iroon Politechniou 51, 57400, Sindos
Country: GREECE
Tel: +30 6946370694
Tel prefix:
Fax:
E-mail address: ncharalampidis@gmail.com
Other E-mails:
Title of the Paper: A high-frequency voltage-follower with global feedback
Authors as they appear in the Paper: N. Charalampidis, M. Spasos,N. Mallios, K. Hayatleh, B.L. Hart, J.F. Lidgey
Email addresses of all the authors: ncharalampidis@gmail.com,spasos@el.teithe.gr,nmallios@hotmail.com,khayatleh@brooks.ac.uk,hart@brooks.ac.uk,lidgey@brooks.ac.uk
Number of paper pages: 11
Abstract: A popular form for a voltage-follower (VF) with global feedback is a voltage operational amplifier (Op-Amp) with 100% negative feedback. Nevertheless, with currently available Op-Amps it is unable to meet high frequency specifications. This paper presents a high frequency voltage-follower based on an overall feedback technique. Despite the global feedback loop, the design presented small-signal bandwidth higher than 3GHz and gain flatness to within 0.1dB up to 170MHz. Due to this feedback loop, the circuits exhibits very high input and very low output impedance. In addition, the output voltage swing achieved is some ±3V, with an input offset current of around 130nA and an offset voltage in the range of 200uV. The proposed circuit is very stable, due to the stability technique used, maintaining low distortion. The total harmonic distortion (THD) of the circuit is better than -65dB and the intermodulation distortion (IMD) is some -70dB, for capacitive loads up to!
10pF. The analysis of the novel circuit has been carried out for operating temperatures from -20oC to +100oC, using Analog Devices' extra fast complementary transistors. The power dissipation is some 52mW on a ±5V power supply, although it can be reduced to ±3.3V, without affecting significantly the performance, depending on the application.
Keywords: Voltage-follower, buffer, low distortion, high frequency, global feedback
EXTENSION of the file: .doc
Special (Invited) Session: A high-speed voltage-follower based on a global feedback technique
Organizer of the Session: 604-185
How Did you learn about congress:
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