20-01-2016, 10:59 AM
Abstract
This paper presents a two-quadrant analog multiplier using only one current differencing transconductance amplifier (CDTA).The proposed circuit features very low circuit complexity, suitable for integrated circuit implementation. Simulation results show performance of the circuit and confirm the validity of the proposed design technique.
INTRODUCTION
An analog multiplier is a device which takes two analog signals and produces an output which is their product. Such circuits can be used to implement related functions such as squares (apply same signal to both inputs), and square roots.Analog multiplier is an important building block in continuous-time signal processing. Analog multipliers are circuits that can be readily found in many analog systems, ranging from the conventional RMS-DC converters, peak and phase detectors, modulators synthesizers, measurement, instrumentation, and control systems .The multiplier and divider based on translinear property of a Bipolar Junction Transistor (BJT) [4], based on square-law characteristic of a CMOS [5], using switched capacitor (SC) [6] have been proposed. Unfortunately, all techniques are suitable for working in voltage-mode. They cannot be applied to employ in a current-mode signal processing circuit, which is continually more popular in present, due to several features such as larger dynamic range, higher signal bandwidth, greater linearity, simpler circuitry and lower power consumption. Current mode multiplier and divider are suitable for standard CMOS fabrication and can be successfully applied to a wide range of different analog systems. Their main features are simplicity, precision, an area-efficient implementation due to the fact that only MOS transistors are employed and wide dynamic range originating from the current mode approach followed.