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I have just started to look closer at the PM3 design and I'm curious about the sample rates.
Can someone a little closer to the design help me out?
What sample rates are used for LF and HF tags? How often do you guys find the need to vary the sample rate to achieve an integer multiple of the data rate for different tags? (Perhaps never if all the data rates are derived from a divided down reference at Fc)
Thanks a bunch for reading.
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Found my answer so I thought I would share:
The sample rate typically is tied to the carrier frequency (re: 13.5Msps @ HF | 125ksps @ LF).
This has the added benefit of aliasing any remaining carrier to DC and 2xFc.
Sub-carriers and data rates are based on the reference carrier frequency so I will unlikely need to vary my sample rate.
Thanks for reading.
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