Novel MOS resistive circuit for synthesis of fully integrated continuous-time filters

Czarnul, Z.

doi:10.1109/tcs.1986.1085974

Cited by 145 publications

(21 citation statements)

References 8 publications

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“…In order to perform the automatic tuning of the CTF, resistors must be implemented by means of electronically tunable circuits. In an on chip implementation, there are several available structures in order to perform the tuning capability such as the he cell known as MOS Resistive Circuit (MRC) [8], [9]. However, as a matter of example, and in order to reveal these dynamical nonlinear phenomena (such as the aforementioned bifurcations and chaotic behavior) in automatic tuning of CTFs, analog multipliers are used as electronically tunable cells in order to implement a discrete implementation of the CTF (Figure 4).…”

Section: Application Example: Discrete Of Continuous-time Filter Withmentioning

confidence: 99%

Observation of chaotic behavior in automatic tuning loops for continuous-time filters

García

Cosp-Vilella

Manzanares-Brotons

2013

2013 IEEE 56th International Midwest Symposium on Circuits and Systems (MWSCAS)

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ResumenEl apropiado modelizado dinámico lineal de filtros de tiempo continuo (CTFs) con lazos de sintonía automática debe llevarse a cabo para poder asegurar la estabilidad cuando queremos diseñar controladores de lazo mejorados. Con este objetivo, a partir de un análisis general y sistemático que permite obtener un modelo incremental linealizado equivalente para pequeña señal, se derivan las funciones de transferencia entre las variables de salida y las tensiones de control. Ello permite, a continuación, un posterior diseño de los compensadores de lazo con mejora en la estabilidad y en las prestaciones dinámicas. Este procedimiento sistemático permite conseguir mejores controladores para los dos lazos de control involucrados. Sin embargo, los CTFs con lazos de sintonía o ajuste automático son sistemas realimentados no lineales que tienden a ser inestables. Es más, fenómenos no lineales, que no pueden predecirse con un enfoque mediante modelos de pequeña señal orientados al diseño, pueden ser observados en este tipo de sistemas de sintonía. El propósito de este trabajo es poner de manifiesto que cuando se varían los parámetros de control, el sistema puede presentar diferentes tipos de fenómenos no lineales dinámicos tales como bifurcaciones y comportamiento caótico, que no pueden ser predichos por el modelo en pequeña señal orientado al diseño.Palabras Clave: Filtros de tiempo continuo, lazos de sintonía automática, modelos incrementales equivalentes linealizados para pequeña señal, sistemas realimentados no-lineales, fenómenos nolineales, bifurcaciones y comportamiento caótico. AbstractThe appropriate linear dynamic modeling of continuous-time filters (CTFs) with automatic tuning loops should be obtained to assure stability in case an improved design of the loop controllers is to be carried out. With this aim, starting from a general and systematic analysis in order to obtain an equivalent smallsignal linearized incremental model, from which transfer functions between output variables and control voltages are derived, the subsequent design of compensated loops with enhanced stability and dynamic performance is required. This systematic procedure allows obtaining improved controllers for the two involved control loops. However, CTFs with automatic tuning loops are nonlinear feedback systems with potential instability. What is more, nonlinear phenomena, which cannot be predicted by a design-oriented small signal modeling approach, are observed in this kind of tuning systems. The purpose of this work is to highlight that when control parameters are varied, the system could present different kinds of dynamical nonlinear phenomena such as bifurcations and chaotic behavior, which cannot be predicted by the small signal design-oriented model.

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Section: Application Example: Discrete Of Continuous-time Filter Withmentioning

confidence: 99%

Observation of chaotic behavior in automatic tuning loops for continuous-time filters

García

Cosp-Vilella

Manzanares-Brotons

2013

2013 IEEE 56th International Midwest Symposium on Circuits and Systems (MWSCAS)

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“…8 shows the circuit embedding of a ®lter biquad section in this FPAA. Programmable resistors are implemented as four-transistor MOS transconductors [64], a circuit arrangement that uses four matched MOS transistors operated in the linear region, cross-coupled such that the non-linear components in the drain currents are cancelled for fully-differential voltage inputs and current outputs. This results in a circuit that can be used as a programmable linear resistor, a signal controlled resistor, a signal multiplier or a polarity change switch.…”

Section: Lee-gulak Transconductor Based Fpaamentioning

confidence: 99%

“…Burr Brown makes a digitally-programmable instrumentation ampli®er [23], using two con®guration bits to vary the gain in decade (1, 10, 100, 1000) or binary (1,8,64,512) steps for applications in data acquisition and instrumentation. The gain is set by a resistor network with resistors selected by switches placed in series with the high-impedance ampli®er inputs, minimizing gain errors due to the switch ON resistance.…”

Section: Programmable Gain Ampli®ersmentioning

confidence: 99%

Design Approaches to Field-Programmable Analog Integrated Circuits

D’Mello¹,

Gulak²

1998

Field-Programmable Analog Arrays

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Abstract. The drive towards shorter design cycles for analog integrated circuits has given impetus to several developments in the area of Field-Programmable Analog Arrays (FPAAs). Various approaches have been taken in implementing structural and parametric programmability of analog circuits. Recent extensions of this work have married FPAAs to their digital counterparts (FPGAs) along with data conversion interfaces, to form FieldProgrammable Mixed-Signal Arrays (FPMAs). This survey paper reviews work to date in the area of programmable analog and mixed-signal circuits. The body of work reviewed includes university and industrial research, commercial products and patents. A time-line of important achievements in the area is drawn, the status of various activities is summarized, and some directions for future research are suggested.

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“…This circuit has been used in many applications, acting as a multiplier or a resistive network [17,[59][60][61]. Let us consider the circuit shown in Figure 20b, where the four-transistor cell is in the feedback path of a single-ended differential amplifier.…”

Section: Type IIImentioning

confidence: 99%

“…Some authors [60,61] have used the circuit in Figure 20b with another four-transistor element at the input, so that I a -I b is obtained from a voltage difference, thus resulting in a voltagemode multiplier/divider. The objective of our application is just the opposite: to add an I-to-V converter so that V a -V b is obtained from a current, I d .…”

Section: Type IIImentioning

confidence: 99%

Implementation of CMOS fuzzy controllers as mixed-signal integrated circuits

Baturone

Sánchez-Solano

Barriga

et al. 1997

IEEE Trans. Fuzzy Syst.

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Abstract:This paper discusses architectural and circuit-level aspects related to hardware realizations of fuzzy controllers. A brief overview on fuzzy inference methods is given focusing on chip implementation. The singleton or zero-order Sugeno's method is chosen since it offers a good trade-off between hardware simplicity and control efficiency. The CMOS microcontroller described herein processes information in the current-domain, but input-output signals are represented as voltage to ease communications with conventional control circuitry. Programming functionalities are added by combining analog and digital techniques, giving rise to a versatile microcontroller, capable of solving different control problems. After identifying the basic component blocks, the circuits used for their implementation are discussed and compared with other alternatives. This study is illustrated with the experimental results of prototypes integrated in different CMOS technologies.

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Novel MOS resistive circuit for synthesis of fully integrated continuous-time filters

Cited by 145 publications

References 8 publications

Observation of chaotic behavior in automatic tuning loops for continuous-time filters

Observation of chaotic behavior in automatic tuning loops for continuous-time filters

Design Approaches to Field-Programmable Analog Integrated Circuits

Implementation of CMOS fuzzy controllers as mixed-signal integrated circuits

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