Abstract— In today’s fast-paced world, engineers need the best tools available to solve their measurement challenges quickly and accurately. There are many types of oscilloscope available in the market. The main types of oscilloscopes are analog oscilloscope, digital oscilloscope and PC based oscilloscope. From which the digital oscilloscope are widely used now a days due there accuracy portability, high speed, high resolution, data storing capability etc. here we provide an alternative solution which is basically a digital oscilloscope with almost all the control options which any standard digital oscilloscope has. It has basically three large blocks, first is the ADC part which has the analog to digital IC which is controlled by the STK500 AVR kit. Second is the oscillator control part which is implanted on the FPGA Spartan 3 kit. It has the entire storage element and the user input control and driver part of IC and VGA. The third large block is display device which is a CRT monitor along this the LEDs and seven segment display part on FPGA is also used to display information. So this is a cheap alternative to expensive oscilloscopes; using a VGA display and a simple mouse interface, a user can use this scope to look at and measure signals up to about 80 MHz if an extra high frequency clock will provide to the design. Keywords- ADC(Analog To Digital IC), FPGA Spartan 3 kit, VGA Display. I INTRODUCTION This digital oscilloscope provides a cheap alternative to expensive oscilloscopes; using a VGA display and a simple mouse interface, a user can use this scope to look at and measure signals up to about 80Mhz. this kind of scope would be ideal for hobbyists and students looking to learn and debug circuits. Development is based on the Spartan III Starter Kit from Xilinx. The ADC is simply controlled by an MCU (another starter kit: the ATK400 from Atmel) but will soon be controlled by the FPGA (to achieve the faster speeds). In the future, schematics and PCB layout binaries will be available. 1. Features • Timescale selection • Selectable trigger (Rising, Falling / Normal, Single, Auto) • Horizontal and Vertical position offsets • Grid Display On/Off/Outline • Semi-standard Oscilloscope look and feel • VGA display; drives a standard computer monitor • PS/2 Mouse User Interface • 9-bit input data width • Developed specifically for the Spartan III development kit from Xilinx. Fig 1: Diagram of Digital oscilloscope 2) Logical diagram: Fig 2: Block diagram of Digital oscilloscope VLSI Based Implementation of a digital Oscilloscope MS. DHANSHRI DAMODAR PATIL PROF. V. M. UMALE Department of Electronics, Department of Electronics, Amravati University, Amravati University, SSGM College of Engineering, SSGM College of Engineering, Shegaon 444203, Shegaon 444203, District: Buldhana, State: Maharashtra District: Buldhana, State: Maharashtra Country:India Country:India dhanshri.patil21@gmail.com vmumale@rediffmail.com Mobile No.9096584765 33 INTERNATIONAL CONFERENCE ON CURRENT INNOVATIONS IN ENGINEERING AND TECHNOLOGY INTERNATIONAL ASSOCIATION OF ENGINEERING & TECHNOLOGY FOR SKILL DEVELOPMENT ISBN: 378 - 26 - 138420 - 5 www.iaetsd.in