REALISATION OF THE OFCC BASED INSTRUMENTATION AMPLIFIER

Abstract

Nowadays, current mode devices are used as active elements at the circuits that work at high frequencies. A novel integrated CMOS based the operational floating current conveyor (OFCC) is used to develop Trans-admittance amplifier (TAM) and Trans-impedance amplifier (TIM) based Instrumentation Amplifier. OFCC is a five-port general purpose analog building block which combines all the features of different current mode devices such as the second generation current conveyor (CCII), the current feedback operational amplifier (CFA), and the operational floating conveyor (OFC). The OFFC is modelled and simulated using 0.5μm CMOS technology kit in Or-cad Capture tool and the supply voltage of the proposed OFCC is 1.5V. Current mode (CM) blocks offers advantages over voltage mode (VM) blocks, such as performance improvement, low power consumption, controlled gain without feedback components, better linearity and improved bandwidth. This gives the motivation to use CM block to implement various ASP applications and to review already existing literatures available using CM blocks. Current conveyor is used as it is a high-performance active element and it ensures high accuracy, wide bandwidth and exceptionally high slew rates combined with low voltage and low power implementations under small or large signal conditions. The main advantage of the proposed OFCC that it provides a wide bandwidth compared to other work. In addition, the applications based on OFCC shows good results compared to others. The new topology of instrumentation amplifier (IA) using OFCC is proposed and analysed which is working in current mode (CM) and low output impedance, high differential mode gain and high CMRR.