Current location - Plastic Surgery and Aesthetics Network - Plastic surgery and beauty - How to measure the frequency of sine signal generated by dds signal generator with equal precision frequency meter designed by fpga?
How to measure the frequency of sine signal generated by dds signal generator with equal precision frequency meter designed by fpga?
Let me give you an idea:

famous book

AD conversion

Set a threshold for the collected data, such as a sine wave with Vpp=0-5V, which can be set to 2-3V (the specific number depends on the AD device), and then record the times of data from 2V to 3V per second, so as to calculate the frequency.