The document discusses the design of a train coder/decoder system. It describes designing a coder with a voltage controlled oscillator and various amplifier designs. The decoder design includes a VCO, DAC, PLL, ADC and filters. The goal is to increase the SNR by lowering noise power and bandwidth or increasing signal power with an amplifier. Coding is also mentioned.

1. Train coder/decoder ECE 775 - project Ivan Razumenić

13. Coder Design VCO control voltage

14. Coder Design VCO DAC

16. Decoder design VCO DAC PLL ADC

17. Decoder design VCO DAC PLL ADC higher frequency oscillations expect some noise

18. Decoder design VCO DAC PLL ADC higher frequency oscillations BP filter expect some noise

19. Design VCO DAC PLL ADC BP filter only one one-sided supply voltage regulator voltage regulator

20. It works VCO DAC PLL ADC BP filter voltage regulator voltage regulator

21. It works, under one condition VCO DAC PLL ADC BP filter voltage regulator voltage regulator

22. Houston, we have a problem VCO DAC PLL ADC BP filter voltage regulator voltage regulator SNR too low

23. How to increase SNR? VCO DAC PLL ADC BP filter voltage regulator voltage regulator lower noise power lower BW

24. How to increase SNR? VCO DAC PLL ADC BP filter voltage regulator voltage regulator lower noise power lower BW

25. How to increase SNR? VCO DAC PLL ADC BP filter voltage regulator voltage regulator lower noise power lower BW

26. How to increase SNR? increase signal power VCO DAC PLL ADC BP filter voltage regulator voltage regulator common collector amp.

27. Solution? VCO DAC PLL ADC BP filter voltage regulator common collector amp.

28. Coding

29. Questions Train Coder/Decoder Ivan Razumenić