Proceedings ArticleDOI
Transforming small-signal modeling into control system modeling
F. Leyn,Willy Sansen,Georges Gielen +2 more
- pp 469-472
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TLDR
This paper describes the transformation of small-signal modeling into control system modeling and results in a behavioral signal path model, which gives insight in the operation of a circuit because it shows all the different conversions from current to voltage and vice versa.Abstract:
This paper describes the transformation of small-signal modeling into control system modeling. Transforming a small-signal circuit into a control system equivalent results in a behavioral signal path model. A behavioral signal path model gives insight in the operation of a circuit because it shows all the different conversions from current to voltage and vice versa, including poles and zeros which cause a de-/increase in transfer along the signal path. The different poles are function of the small-signal parameters of the different devices and are modeled with small symbolic equations, which make them fully comprehensible. This enables the designer to really control the sizing process by enabling pole-zero placement. On a behavioral signal path model, all theorems of control theory as well as approximations can be performed. The methodology and its applications are illustrated with examples.read more
Citations
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Proceedings ArticleDOI
An efficient DC root solving algorithm with guaranteed convergence for analog integrated CMOS circuits
TL;DR: A new DC modeling methodology applicable to CMOS integrated circuits that is named operating point driven DC formulation because the operating point is specified directly, and the device dimensions W and L are determined out of it.
Proceedings ArticleDOI
Constructing Symbolic Models for the Input/Output Behavior of Periodically Time-Varying Systems Using Harmonic Transfer Matrices
TL;DR: A new technique is presented, based on the organisation of the harmonic transfer functions into a harmonic transfer matrix, which allows to manipulate LPTV systems in a way that is similar to linear time-invariant (LTI) systems, making it possible to generate symbolic expressions.
Efficient behavioral signal path transfer function evaluation
TL;DR: This paper presents a behavioral signal path modeling method for the AC part of a design plan, which gradually simplifies the original (small-signal) circuit up to a level with sufficient accuracy over the complete design space, with a minimal amount of equation clusters or simultaneous AC constraints.
References
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A fast-settling CMOS op amp for SC circuits with 90-dB DC gain
K. Bult,G.J.G.M. Geelen +1 more
TL;DR: In this article, a technique that combines the high-frequency behavior of a single-stage op amp with the high DC gain of a multistage design is presented, which is based on the concept that a very high-DC gain can be achieved in combination with any unity-gain frequency achievable by a (folded-) cascode design.
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Symbolic analysis methods and applications for analog circuits: a tutorial overview
TL;DR: The history and present state of the art in symbolic analysis of electronic circuits at the so-called circuit level is given, and algorithmic details are provided for symbolic approximation, hierarchical decomposition, and symbolic distortion analysis.
Journal ArticleDOI
Improved synthesis of gain-boosted regulated-cascode CMOS stages using symbolic analysis and gm/ID methodology
TL;DR: In this paper, a systematic study of the gain-boosted regulated-cascode operational transconductance amplifier (OTA) CMOS stage is presented, where the pole-zero behavior is described and design criteria for optimal settling time are proposed.
Proceedings ArticleDOI
A behavioral signal path modeling methodology for qualitative insight in and efficient sizing of CMOS opamps
TL;DR: A new modeling methodology that allows to derive systematically behavioral signal path models of operational amplifiers to provide high qualitative insight in the small-signal functioning of a circuit is described.
Proceedings ArticleDOI
A behavioral signal path modeling methodology for qualitative insight in and efficient sizing of CMOS opamps
TL;DR: In this article, the authors describe a new modeling methodology that allows to derive systematically behavioral signal path models of operational amplifiers, which provide high qualitative insight into the small-signal functioning of a circuit.