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September 28th 06, 09:42 PM
posted to rec.radio.amateur.homebrew
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Input Bandwidth of an ADC.
On 2006-09-28, wrote:
I am not sure why is this input bandwidth different from Fs/2. It's really two different bandwidths. Fs is determined by the bandwidth of the signal. If you filter a 10MHz passband from a 1GHz signal, your Fs calculation is based on the 10MHz of signal (if you choose to undersample, which would clearly be to your advantage in a case like this). However, since it's up at 1GHz, even though you might be able to use a Fs 20MHz, the ADC must have a sample and hold bandwidth 2GSps. If your input signal has components from DC up to your desired signal, then the two bandwidths are the same. -- Ben Jackson AD7GD http://www.ben.com/ |
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