Fifth derivative Gaussian pulse generator for UWB Breast Cancer Detection System

Design and test results of a fabricated integrated circuit Fifth-Order Derivative Gaussian Pulse Generator - FODGPG in a standard IBM 0.18 μm CMOS technology is presented. Is proposed a FODGPG that uses: (a) static inverters based delay circuit; (b) Phase Detector with n-dynamic block, n-Latch and static inverter and (c) NMOS Pulse Shaping circuit designed for high speed. The Transistor Dimensions were defined in order to obtain adequate characteristic of a fifth derivative Gaussian Pulse considering required specifications of Breast Cancer Detection System. Full custom layout with minimal dimensions was implemented. Five different fabricated IC´s were tested and values of power supply, peak to peak voltage and width pulse were measured. The measured power supply was 244 μW, output pulse peak to peak amplitude was 115.2 mV and pulse width of 407.8 ps with a sinusoidal input signal of 100 MHz. The Pulse Generator circuit was tested resulting in Power Spectral Density with bandwidth of 0.6 GHz to 7.8 GHz that is adequate for UWB applications in Breast Cancer Detection.