TRANSMITTER USING GROUNDED COMPLEX CAPACITOR

Abstract

The project deals with simulation of grounded complex capacitor ,using which as a low pass filter a time varying signal is band limited and the band limited signal is given to a signal processing block which removes the DC offsets from the complex filter output and an amplifier which converts few milli volt signal to a 10 volt peak signal. This was done because the next stage (analog to digital converter) was not compatible to milli volt signal; therefore the signal had to be amplitude amplified. Then the signal is sampled and converted into digital equivalent by using a counter type analog to digital converter. The analog to digital converter used in the project also uses a digital to analog converter. The opamp based weighted digital to analog converter is used in the project for this purpose. The digital bits when converted back to analog voltage is then compared to the input analog voltage and accordingly the digital bits are upgraded. The upgradation of the digital bits is done by the digital counter. Here 4 bit up counter is used for the same. The results were verified using Spice simulation which came out to be in line with the theoretical expectations.