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?
No.
If you solve the above equation with "7kOhms" and "10nF" then the result "f" = 2.27kHz ... this is far away from 100MHz.
What do you try to achieve?