A problemn about Berkeley Thomas cho's PHD about ADC

[gdhp]

thomas cho berkeley

In the phd paper of Thomas cho's ADC, page 100.

He said large error correction range can eliminate the dedicated input S/H circuit. And

the input signal can be sampled simutaneously by switched capacitor amp and dynamic

comparatorof flash A/D.

How to understand this? Then he give a input band limite range for input.

Two quesitons:
1. Why large error correction range can eliminate the need of input S/H circuit? What is

their relations?

2. Because no S/H circuit, so there is an input bandwidth range. As the fomular gives?

Thanks!

Attach is the phd paper!

 

[Vamsi Mocherla]

Where is the paper?

 

[hr_rezaee]

Hi
If signals changes less than 1 LSB (LSB of first GS) in interval between end of sampling and beginning of comparator decision, we can remove S/H circuit.
so I think
dV/dt<1 LSB/Tinterval
V=a sin(2pi*f)
a*2pi*f< 1 LSB/Tinterval
f<1 LSB/(Tinterval*2pi*a)

I'm not sure
this is just my opinion.
regards