ATMega162 based homemade digital oscilloscope project with a sampling rate of 40MSPS and 5MHz maximum input frequency.
An oscilloscope is one of the most important tools that should take
place on a electronics hobbyist’s workbench. But most of the commercial
oscilloscopes are often too expensive. This LCD screen homemade scope features;
- 40 Mega samples per second
- 5 MHz input frequency
- 10 MHz max. frequency displayed without aliasing
- 20 MHz input circuit bandwidth
- 40mV/div sensitivity
- DC coupling
- 10 KOhm input impedance
- 240×128 total, 200×125 trace resolution
- 9V – 1A power source
- Digitally adjustable trigger and trace offset.
Main part of the circuit is Atmel ATMega162 microcontroller. OPA2652
and RF filter pair sets the BW to 20MHZ. 8 bit 60MSPS ADS830 IC is used
for the analog to digital conversion. The digital output is connected
to a high speed FIFO memory.
