CURRENT CONVEYOR BASED VLSI DESIGN

Abstract

Current conveyor is a current mode circuit. In recent years, the current conveyor is receiving considerable attention as they offer analog designers some significant advantages over the conventional op-amp. The current conveyor is a good choice for low voltage applications. It provides some notable features like high gain-bandwidth product ,flexibility of driving current or voltage signal output at its two separate nodes, relatively high slew rate, reduced supply voltage of integrated circuits. In addition, it requires smaller number of passive components to perform a specific function. Hence, it is suitable for both current and voltage mode devices. Current mode design technique offers voltage independence, high bandwidth in analog circuits with properties of accuracy and versatility in a wide range of applications. In this report we present a rail-to-rail low voltage (±2.5 V) differential current conveyor (DDCC) circuit in standard CMOS technology that is suited for low voltage operation. The simulated circuit uses a low-voltage current-mirror. In this report, a few applications of the DDCC like Full Wave Rectifier , Quadrature Oscillator and Current Multiplier & Divider have also been simulated. For simulation, 0.5 µm technology of SPICE has been used. The need for low-voltage low-power circuits is immense in portable electronic equipments like laptop computers, pace makers, cell phones etc. Voltage Mode Circuits are rarely used in low-voltage circuits as the minimum bias voltages depend on the threshold voltages of the MOSFETs