A nonlinear macromodel for CMOS OTAs

Gomez, Gabriel; Embabi, S.H.K.; Sánchez-Sinencio, E.; Lefebvre, Martin

doi:10.1109/iscas.1995.519915

Cited by 23 publications

(11 citation statements)

References 3 publications

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“…The above macro model has been found to be similar to that proposed in [17] ] s2 adopted from [16] depicted above. Furthermore, the L gm0 J necessary OTA's parameters have also been adopted from [16] for the parameterization of the proposed passive + C + 2(Cic + Cid + CO ) + 4,rG0 s (4.3) equivalent circuit model.…”

supporting

confidence: 71%

“…3. The linear two stages macro model of the CMOS-OTA parameters have been adopted from [16]. The adopted basis CMOS-OTA can be depicted as follows.…”

mentioning

confidence: 99%

“…Furthermore, the L gm0 J necessary OTA's parameters have also been adopted from [16] for the parameterization of the proposed passive + C + 2(Cic + Cid + CO ) + 4,rG0 s (4.3) equivalent circuit model. Finally, it should be mentioned 2 here that the comparative frequency response of the L mmo magnitude of the impedance functions which is the basis 2G0 for the accuracy evaluation of our interested has been plotted based upon the simulation by using ORCAD PSpice version 9.1.…”

mentioning

confidence: 99%

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Novel Complete Passive Equivalent Circuit Model of the Practical 4-OTA-Based Floating Inductor

Banchuin

Chipipop

Sirinaovakul

2007

2007 IEEE Workshop on Signal Processing Systems

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Recently, the OTA has been widely used in filter design [10]. The OTA can be used as the basis active elements for In this research, the practical 4-OTA-based floating the construction active inductors of the first category and inductor based upon the often cited monolithic CMOS yield the so called OTA-based inductor which can be both technology has been studied and its complete passive grounded and floating type. It can be seen that there are two equivalent circuit model, where the effects of both parasitic possible topologies for the floating type of the OTA-based elements and finite opened-loop bandwidth have been taken inductor which use three and four OTAs entitled the 3-into account, has been proposed. The accuracy evaluation of OTA-based and the 4-OTA-based floating inductor the proposed model has also been performed. The resulting respectively. These OTA-based-floating inductors can be model has been found to be excellently accurate with a depicted as follows. considerably very small average error. Furthermore, the further study which is the inclusion of the mismatches among OTAs in order to obtain the most accurate results 93g1 gg ' @ -has also been proposed. However, the proposed passive equivalent circuit model has been found to be a c C convenience tool for the design of any signal processing I circuits which require the CMOS-OTA-based floating inductors due to its considerably very small average error Fig. 1. 3-OTA-based floating inductor (left) and 4-OTA-based and the nature of the monolithic CMOS technology which floating inductor (right) allows the exclusion of the mismatches among OTAs.Since the active inductors of both folds have been Index Terms-Passive equivalent circuit model, found to be hard to analyze both manually and with Equivalent circuit model, OTA-based floating inductor, computer aided, the passive equivalent circuit models of OTA-based inductor, Active inductor, CMOS-OTA these active inductors which adequately and accurately model the impedance characteristics of the active inductors 1. INTRODUCTION but much far simpler to analyze have been constructed in order to simplify the circuit analysis and designing task. Active inductors have been found to be applicable in many There are many examples of theses passive equivalent signal processing circuits. These active inductors can be circuit models e.g. the one in [10] and that proposed in [11] constructed based upon the concept of inductor realization etc. It can be seen that the one proposed in [10] is belonged by the gyrator-C combination and can be classified into two to the practical OTA-based grounded inductor but with only folds. Those belong to the first category are constructed at the effect of the parasitic elements have been taken into the network level basis by using the available active account while the effect of the OTA's finite opened-loop building block as the basis active element for the gyrator bandwidth has been neglected, hence the resulting model construction and use the discrete external capacitor to has been...

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supporting

confidence: 71%

“…3. The linear two stages macro model of the CMOS-OTA parameters have been adopted from [16]. The adopted basis CMOS-OTA can be depicted as follows.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

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Novel Complete Passive Equivalent Circuit Model of the Practical 4-OTA-Based Floating Inductor

Banchuin

Chipipop

Sirinaovakul

2007

2007 IEEE Workshop on Signal Processing Systems

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“…There are two main types of macromodels [2,4]: pure behavioral and structural ones. The first type is based on mathematical models, which do not offer an insight into the circuit structure.…”

Section: Introductionmentioning

confidence: 99%

Fuzzy logic technique for accurate analog circuits macromodel sizing

Díaz‐Madrid¹,

Hinojosa²,

Doménech‐Asensi³

2008

Circuit Theory & Apps

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SUMMARYDesign of analog integrated circuits requires extensive simulations at low levels of the analog design hierarchy. The simulations increase the overall design time and, thus, the analog part of a mixed ASIC requires most of the design time while using only a small part of the silicon die. To improve the efficiency of these simulations, it is necessary to use methodologies and tools based on hierarchical descriptions, where macromodels play an essential role. In this paper, an approach for applying fuzzy logic for accurate analog circuit macromodel sizing is presented. In our proposed method, multiple adaptive neuro-fuzzy inference systems are trained to predict the performance characteristics (gain, bandwidth) of CMOS analog circuits. Moreover, the presented methodology provides reusable macromodels, since it is applicable for large number and large range of design parameters. This technique is applied to the accurate sizing of fully differential telescopic operational transconductance amplifier macromodel, a circuit widely used in the design of high-performance analog-to-digital converters. The neuro-fuzzy computed characteristic values are in excellent agreement and one order of magnitude faster than those obtained from device level SPICE simulations. Moreover, this method offers the best accuracy in comparison with other classical techniques such as polynomial regression, spline interpolation or artificial neural networks.

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“…Macromodels can be classified in two main types [4]: pure behavioural and structural ones. Behavioural macromodels are based on mathematical models which do not offer insight of the circuit structure.…”

Section: Introductionmentioning

confidence: 99%

Accurate and reusable macromodeling technique using a fuzzy-logic approach

Doménech‐Asensi

Hinojosa

Ruíz

et al. 2008

2008 IEEE International Symposium on Circuits and Systems (ISCAS)

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An approach for applying fuzzy logic for accurate analog circuit macromodel sizing is presented. In our proposed method, multiple adaptive neuro-fuzzy inference systems (MANFIS) are trained to predict the performance characteristics (gain, bandwidth) of a fully differential telescopic transconductance amplifier (OTA). The neuro-fuzzy computed characteristic values are in excellent agreement and one order of magnitude faster than those obtained from device level SPICE simulations. This technique allows the generation of accurate, efficient and reusable models of analog circuits. It is demonstrated and compared with other classical techniques like polynomial regression or artificial neural network approaches. ©2008 IEEE

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A nonlinear macromodel for CMOS OTAs

Cited by 23 publications

References 3 publications

Novel Complete Passive Equivalent Circuit Model of the Practical 4-OTA-Based Floating Inductor

Novel Complete Passive Equivalent Circuit Model of the Practical 4-OTA-Based Floating Inductor

Fuzzy logic technique for accurate analog circuits macromodel sizing

Accurate and reusable macromodeling technique using a fuzzy-logic approach

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