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Journal of Radio Electronics Online scientific journal · eISSN 1684-1719
2018, № 4 · MATHEMATICAL MODELS IN RADIO ELECTRONICS PROBLEMS

Применение методов оптимизации при проектировании аналоговых схем радиоэлектроники

M.M. Gurarii1, M.M. Zharov1, N.N. Prokopenko1, S.G. Rusakov1, S.L. Ulianov1

1 Институт проблем проектирования в микроэлектронике Российской академии наук, 124365, г. Москва, ул. Советская, д. 3, Russia
Full text (PDF) DOI: 10.30898/1684-1719.2018.4.6 UDC 621.3.049.774; 519.853.6 EDN XOXTYT

Abstract

The application of optimization methods for determining parameters of analog integrated circuits is considered. The different types of optimization problem definition and methods of solving the optimization problems are given for the fast operational amplifiers and linear voltage regulators circuit classes. In design of CMOS Op-Amp circuits the conflicting design requirements must be met, including constraints on gain, power consumption, noise, phase margin etc., that makes difficult the problem of circuit parameters determination. For system on chip applications the solution of the important problem of reduction of power consumption while increasing the circuit performance is required. The CMOS Op-Amp with dual-input stage architecture is the promising class for these applications due to the fact that it can provide high values of slew rate. To avoid the degradation of stability of a circuit the frequency compensation technique is applied. In this paper the parameter optimization problem of high-speed CMOS folded cascode Op-Amp with dual-input stage and current mirror based push-pull parallel channels is considered. The problem formulation to obtain minimum power consumption under given constraints on slew rate, gain, unity gain frequency and phase margin is presented. Linear voltage regulators are the most popular circuits widely used in power management systems. The integration of linear regulators in a system-on-chip requires the output capacitor value reduced to a level that can be realized on chip. The frequency compensation scheme is used to provide the stability of a circuit. Transient response characteristics of a voltage regulator strongly depend on the combination of compensation capacitors and load capacitor. The main design problem is to find a trade-off between stability, precision, and fast-transient characteristics. The formulation of the optimization problem involves the minimization of the sum of capacitances under constraints on transient response characteristics and transistors sizes. The optimization subsystem with simulation-based optimization technique is described. Examples of circuit parameters optimization are given.

  • operational amplifier
  • linear voltage regulator
  • system on chip
  • circuit simulation
  • parameter optimization
  • optimization methods
Аннотация (на русском)

Применение методов оптимизации при проектировании аналоговых схем радиоэлектроники

Обсуждается применение оптимизационных методов для решения задачи определения параметров аналоговых микросхем (АМ) в процессе их проектирования. Приводятся постановки оптимизационной задачи и методики ее решения для двух классов АМ - быстродействующих операционных усилителей и линейных компенсационных стабилизаторов напряжения с непрерывным регулированием (КСН). Выбор данных классов АМ обусловлен их широким распространением, наличием противоречивых проектных требований, которые влияют на сложность задачи определения оптимальных параметров. Приводится описание подсистемы оптимизации и результаты ее применения при проектировании быстродействующих КМОП операционных усилителей и биполярных КСН для «систем на кристалле».

For citation

Gurarii M.M., Zharov M.M., Prokopenko N.N., Rusakov S.G., Ulianov S.L. Применение методов оптимизации при проектировании аналоговых схем радиоэлектроники // Journal of Radio Electronics. – 2018. – No. 4. https://doi.org/10.30898/1684-1719.2018.4.6

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