Computer Aided Design Automation of Low Power, Low Voltage Four Quadrant Transconductance Multiplier

Abstract

Analog and mixed signal (AMS) design are important part of system on chip design (SoC), application specific design (ASIC) in short embedded system design which links digital designs to analog world. The IC technologies are scaled to finer feature sizes and circuit applications move to higher frequency bands, analog/RF circuit design faces several new challenges. It is found that AMS design consumes considerable portion of the total chip design cycle time. In contrast to digital systems, the design and verification of analog and mixed signal systems is a challenging task due to the fact there are many CAD tool are available for digital system design where as when it comes to AMS design it is still a fancy. The CMOS multipliers implementation is still a challenging subject especially for low voltage and low power circuit design which is requirement of embedded system. This paper describes automation of the simple four quadrant CMOS multiplier operated in saturation region using a practical methodology for synthesis of analog circuits It involves embedding knowledge into pure simulation based methodology without any intervention from expert designers. In order to evaluate the fitness of the circuit specifications in any iteration of SA, NGSPICE simulation is used. The simulation results confirm the efficiency of presented methodology in determining the device sizes in analog circuits.