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Synthesis‐oriented double‐loop feedback model
Author(s) -
van Hartingsveldt Koen,
Verhoeven Chris. J. M.,
van Roermund Arthur H. M.
Publication year - 2017
Publication title -
international journal of circuit theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.364
H-Index - 52
eISSN - 1097-007X
pISSN - 0098-9886
DOI - 10.1002/cta.2377
Subject(s) - loop gain , feedback loop , amplifier , loop (graph theory) , control theory (sociology) , computer science , transfer function , electrical impedance , open loop gain , output impedance , negative feedback amplifier , ideal (ethics) , block (permutation group theory) , signal (programming language) , topology (electrical circuits) , operational amplifier , mathematics , engineering , telecommunications , control (management) , voltage , philosophy , geometry , computer security , bandwidth (computing) , combinatorics , artificial intelligence , epistemology , electrical engineering , programming language
Summary This paper presents a new feedback model that focuses on the synthesis rather than the analysis of feedback amplifiers. First, a single‐loop synthesis‐oriented feedback model is developed that enables the full synthesis of such amplifiers in a hierarchical and systematic way. This model is subsequently extended to a double‐loop synthesis model, so that also feedback amplifiers with a characteristic input or output impedance—employing two feedback loops—can be synthesized through the same systematic approach. That these new models are suitable for synthesis lies in the fact that they map directly to the circuit level, such that the intended, asymptotic behavior as well as the various individual contributors to the deviation from this intended behavior, like finite loop gain, non‐ideal input and output impedances of the forward gain block, direct feed‐through and attenuations outside the feedback loop(s), are clearly distinguished and can be assigned to the responsible sections of the network. For this purpose, the double‐loop synthesis model makes the transfers of the two feedback networks explicitly visible, so that it gives immediate insight in how to design these networks to get the required signal transfer and characteristic impedance. Copyright © 2017 John Wiley & Sons, Ltd.