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2 results on '"Bandwidth improvements"'

1. A time-delay technique to improve GBW on negative feedback amplifiers

Author

Rui Aguiar and Luis Nero Alves

Subjects
Bandwidth improvements, Delayed feedback, Feedback, Time delaying, Bandwidth, Control theory, Military data processing, Delay elements, Electrical and Electronic Engineering, Delays, Operational amplifier (Opamp), Shunt feedback, Operational amplifiers, Telecommunication cables, Applied Mathematics, Telecommunication systems, Time-delay elements, First orders, Gain-bandwidth product (GBWP), Gain-bandwidth product, Computer Science Applications, Electronic, Optical and Magnetic Materials, Electric cables, Feedback amplifiers, Amplifiers (electronic), Negative feedback amplifiers, Feed back loops, Electric network analysis, Time delay
Abstract

Submitted by Luis Alves (nero@ua.pt) on 2012-01-12T16:05:19Z No. of bitstreams: 1 441.PDF: 318358 bytes, checksum: a75f0180df2e0fd58025ec4af95d5929 (MD5) Made available in DSpace on 2012-01-18T10:25:49Z (GMT). No. of bitstreams: 1 441.PDF: 318358 bytes, checksum: a75f0180df2e0fd58025ec4af95d5929 (MD5) Previous issue date: 2008

Published
2008

2. General model for delayed feedback and its application to transimpedance amplifier's bandwidth optimization

Author

Rui L. Aguiar, E.A.L. Macedo, Luís Soares Barbosa, and L. Nero Alves

Subjects
Transimpedance amplifier, Engineering, Bandwidth optimization, business.industry, Electric impedance, Amplifier, Bandwidth (signal processing), Bandwidth improvements, Feedback loop, BiCMOS, Bandwidth reduction, Feedback, Feedback amplifiers, Bandwidth, Control theory, Delay elements, Negative feedback amplifier, Electronic engineering, BiCMOS technology, business, Hardware_LOGICDESIGN, Electronic circuit
Abstract

Delays in real systems can be of two types: i) intrinsic delays - due to the physical principles of operation of each electronic device; ii) designed delays - due to extra circuits used to add the desired delay. Previous work established the possibility of achieving bandwidth improvements using small delays inside the feedback loop of feedback amplifiers. The modeling approach followed on these contributions used only one designed delay element. The bandwidth reduction effect due to intrinsic delays was not considered on these contributions. This paper extends the concept to the general case of feedback amplifiers that incorporates delays of both types. An experimental demonstration using a simple 0.35μm BiCMOS transimpedance amplifier further confirms the proposed model. © 2006 IEEE.

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