Hi, Guys,
I read a paper in ISSCC 2006, "An 80/100MS/s 76.3/70.1dB SNDR ΔΣ ADC for Digital TV Receivers" .
It reads that
Quote:The ΔΣ ADC achieves a 76.3/70.1dB peak SNDR over a 3.2/4MHz bandwidth while consuming 23.8/34.4mW from a 1.8V supply, which leads to a 0.7/1.64pJ/conversion FOM
I calculated and found that the FOM should be 1.4/3.29pJ/conversion, which are twice of the FOM in that paper. My formula is
Power
FOM=---------------------
2^ENOB * bandwidth
where bandwidth is 3.2/4MHz respectively.
I am sure this formula is correct when I calculate FOM of nyquist ADCs, where bandwidth is ERBW or fs. But for an oversampling ADC, Mm......
Am I wrong?
Best regards,
Yawei