I’m trying to implement 8 bit ADC in FPGA. FPGA running at 100MHz clock. PWM signal is given to RC filter. Knowing that f=1/2piRC, I have trouble with choosing the component's value. Is there any rule to find RC values and frequency?
I chose 100Mhz frequency, 7Kohm resistor and 10nF capacitor. I didn’t‘t get expected output. I used LVDS buffer of FPGA as comparator. Considering the LVDS behavior, How to find resistor value?