Hi experts,
I was looking thru some of my old notes from school, and I came across the topic of Nyquest sampling criteria.
When I studied it, I was taught, for an analog signal to be accurate represented in the digital domain, it needs to be sampled at twice the frequency.
So, a input signal at 1 Mhz, feeding into a ADC, it will need to be sampled at 2 Mhz, ie, 2 Msps
Recently, I start digging around and did my research, and this is what I am begin to wonder:
It is the BANDWIDTH of the input that needs to be less than ½ of the sampling frequency. So given the same ADC above with 2 Msps, if the signal is 1 Ghz, as long as its BANDWIDTH is less than 2 Mhz. the signal can be properly captured in the digital domain.
What do you think? Please advise.
Tom
I was looking thru some of my old notes from school, and I came across the topic of Nyquest sampling criteria.
When I studied it, I was taught, for an analog signal to be accurate represented in the digital domain, it needs to be sampled at twice the frequency.
So, a input signal at 1 Mhz, feeding into a ADC, it will need to be sampled at 2 Mhz, ie, 2 Msps
Recently, I start digging around and did my research, and this is what I am begin to wonder:
It is the BANDWIDTH of the input that needs to be less than ½ of the sampling frequency. So given the same ADC above with 2 Msps, if the signal is 1 Ghz, as long as its BANDWIDTH is less than 2 Mhz. the signal can be properly captured in the digital domain.
What do you think? Please advise.
Tom