Design of a High Linearity Four-Quadrant Analog Multiplier in Wideband Frequency Range

By Abdulkareem Mokif Obais and Rusul Salah Khadair
Department of Electrical Engineering College of Engineering, University of Babylon

Abstract
In this paper, a voltage mode four quadrant analog multiplier in the wideband frequency rangeis
designed using a wideband operational amplifier (OPAMP) and squaring circuits. The wideband
OPAMP is designed using 10 identical NMOS transistorsand operated with supply voltages of ±12V.
Two NMOS transistors and two wideband OPAMP are utilized in the design of the proposed squaring
circuit. All the NMOS transistors are based on 0.35?m NMOStechnology. The multiplier has input and
output voltage ranges of ±10 V, high range of linearity from -10 V to +10 V, and cutoff frequency of
about 5 GHz. The proposed multiplier is designed on PSpice in Orcad 16.6.

Keywords: Analog multiplier, operational amplifier, squaring circuit, linearity