CMOS CDTA BASED ANALOG FILTER REALIZATION

Abstract

This thesis explores the design and analysis of a CMOS-based universal inverse bi quad filter utilizing a Current Differencing Transconductance Amplifier (CDTA). The proposed circuit leverages a minimal passive component set, consisting of grounded capacitors and strategically chosen resistors, to achieve reconfigurable lowpass, bandpass, and highpass filtering functionalities. This eliminates the need for hardware reconfiguration for different filter types, enhancing circuit flexibility. The design prioritizes manufacturability by employing grounded capacitors, facilitating integration into compact ICs. Furthermore, a non-ideal analysis reveals low sensitivity to component variations, ensuring robust performance under practical operating conditions. SPICE simulations, incorporating realistic transistor model parameters, were conducted to validate the theoretical predictions of the circuit's behaviour. The simulated results exhibit close agreement with the theoretical analysis, demonstrating the accuracy of the proposed design. This universal inverse biq-uad filter offers several technical advantages that the circuit offers the flexibility to achieve lowpass, bandpass, and highpass filtering responses through the selection of passive component values, eliminating the need for hardware modifications. The utilization of grounded capacitors simplifies the design and facilitates integration into ICs due to reduced layout complexity and compatibility with standard fabrication processes. Non-ideal analysis demonstrates low sensitivity to component variations, resulting in robust circuit performance despite potential manufacturing tolerances or environmental variations. This design presents a versatile and efficient solution for various analog signal processing applications demanding reconfigurable filtering functionalities and compatibility with IC integration.