STUDY OF NON-LINEAR CIRCUITS AND IMPLEMENTATION OF DUAL MODE BIQUADRATIC FILTER

Abstract

The reduction of the minimum feature size of an MOS transistor for digital VLSI circuits has been ongoing for the past few decades. As the channel length is scaled down into deep sub micrometer dimensions, the lower power supply voltage is required to ensure the device reliability. To be compatible with digital VLSI technologies, analogue integrated circuits, which can operate at low supply voltages, are also receiving significant attention. This has resulted in development of various current mode analog building blocks. Analog filters can be found in almost every circuit, audio systems use them for pre-amplification, equalization and tone control, communication system filters are used for tuning in specific frequencies and eliminating others whereas digital signal processing systems use filters to prevent aliasing of out of band noise and interference. However, a multivibrator is an electronic circuitry that switches between two or more states by means of positive feedback. The common applications of Multivibrators are in square wave generator, timer or where timed intervals are required. \ The objective of the project is to design a monostable multivibrator using latest analog building block which overcomes the limitation of minimum pulse width, electronic tunability in multivibrator and to design circuit of filters which can work in both current and voltage mode with high bandwidth. Keeping the commercialization of the circuit in mind all circuits are simulated using commercial available IC’s.