"JOURNAL OF RADIO ELECTRONICS" (Zhurnal Radioelektroniki ISSN 1684-1719, N 4, 2018

contents of issue      DOI  10.30898/1684-1719.2018.4.6     full text in Russian (pdf)  

Application of optimization methods in design of analog radioelectronics circuits


M. M. Gourary, M. M. Zharov, N. N. Prokopenko, S. G. Rusakov, S. L. Ulyanov

Institute for Design Problems in Microelectronics of the Russian Academy of Sciences, Sovetskaya 3, Moscow124365, Russia


 The paper is received on March 31, 2018 


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.

Key words: operational amplifier, linear voltage regulator, system on chip, circuit simulation, parameter optimization, optimization methods.


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For citation:
M. M. Gourary, M. M. Zharov, N. N. Prokopenko, S. G. Rusakov, S. L. Ulyanov. Application of optimization methods in design of analog radioelectronics circuits. Zhurnal Radioelektroniki - Journal of Radio Electronics. 2018. No. 4. Available at http://jre.cplire.ru/jre/apr18/6/text.pdf

DOI  10.30898/1684-1719.2018.4.6