matko
Newbie level 3
Hi all,
i want to measure the ENOB of a fully differential flash ADC. I have vin+ and vin- as inputs and to output signals after each of 2^n-1 stages (after a latch: q and q_bar). The outputs are converted by an ideal DAC to an anlog voltage (stair-function).
I can now look at the differential signals (input and output) or only to the single ended signals. In the single ended case my LSB is 50mV and of course in the differential case it is doubled 100mV.
How should i measure the ENOB (single/differential)? I have seen plots, where the single/differential ended ENOB curves are different.
If i'm using differential signaling i have doubled the signal range, so i get 3dB, right? Should i expect a better enob?
Thank you! M
i want to measure the ENOB of a fully differential flash ADC. I have vin+ and vin- as inputs and to output signals after each of 2^n-1 stages (after a latch: q and q_bar). The outputs are converted by an ideal DAC to an anlog voltage (stair-function).
I can now look at the differential signals (input and output) or only to the single ended signals. In the single ended case my LSB is 50mV and of course in the differential case it is doubled 100mV.
How should i measure the ENOB (single/differential)? I have seen plots, where the single/differential ended ENOB curves are different.
If i'm using differential signaling i have doubled the signal range, so i get 3dB, right? Should i expect a better enob?
Thank you! M