DESIGNING OF MICROWAVE DIFFERENTIATOR AND INTEGRATOR USING DSP TECHNIQUE

Abstract

The differentiator and integrator have many advantagesand are very useful signal processing tool which makes them suitable for a wide varieties of applications.Differentiator finds wide applications in many areas such as speech systems, image processing, radar and biomedical engineering. The integrator has been used extensively in many areas such as correlation estimation, waveform shaping and accumulator analysis. So far, the differentiator and integrator are mainly implemented in circuits for low-speed applications. Thus the implementation of these circuits for high frequency applications has been largely ignored. In this thesis, simple and accurate formulations are presented to represent stable and optimized discrete-time infinite impulse response processes for both first order differentiators and integrator in the Z-domain.These formulations, in conjunction with the representations of transmission-line elements in the Z-domain, leads to transmission-line configuration that are eligible for wide-band microwave circuits. Design simulations for digital differentiator and integrator are performed in Agilent SystemVueand MATLAB. In order to translate these circuits for high frequency application, T-parameter (chain scattering parameter) is employed.A detailed mathematical analysis of each design is analysed and corresponding Matlab codehas been generated. The MATLAB simulations were compared with Agilent Advanced Design System (ADS) simulations in order to find the optimal design parameters required to arrive at an approximate solution. ADS simulations were used to accurate determine the final design. The designed models are implemented using non-uniform microstrip lines in Agilent ADS and Agilent EMPro. Simulation results shows proposed models as good candidate for wide band microwave application.