Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

how to test a flash adc

Status
Not open for further replies.

niket_jmd

Newbie level 6
Joined
Aug 19, 2007
Messages
11
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,355
i have made a flash adc in mentor tools its 6 bit nd flash architecture

so how to check the specification of adc
i mean INL and DNL etc how to make these tests??
 

dachuan315

Junior Member level 2
Joined
May 11, 2007
Messages
21
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,358
you can input a ramp signal. ideal number is a code display times with ideal condition. active number is a code display times with active condition.
DNL(i)=(ideal number - actvie number)/ideal number
INL(i)=∑DNL(0:i)
 

niket_jmd

Newbie level 6
Joined
Aug 19, 2007
Messages
11
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,355
thnks...............and wht abt sndr and snr ..........i mean dynamic chracterstic
 

rajashekar333

Newbie level 6
Joined
Sep 7, 2007
Messages
14
Helped
2
Reputation
4
Reaction score
1
Trophy points
1,283
Activity points
1,364
Hi niket,
I am working on same design of TIQ flash ADC using mentor graphics tools.how did u find the speed of adc,can you please give me ur specifications ,how speed it is workin.
thaks a lot in advance.
Regards,
Raj
 

niket_jmd

Newbie level 6
Joined
Aug 19, 2007
Messages
11
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,355
finding speed is simple as we can find the code trasition delay.......with respect to clock........generally sndr and snr falls and which defines the max inp frequency........stilll i have to check it
 

windgone0204

Newbie level 6
Joined
Sep 8, 2006
Messages
12
Helped
1
Reputation
2
Reaction score
0
Trophy points
1,281
Activity points
1,348
you can give a sin signal,then you can analyse the output datas with spice-explore:converte the output datas to digital signal,then converte the digital signal to analog signal,finaly u can get the sndr,snr,sfdr,enob,etc. you also can refer to the spice-explore help.
 

    niket_jmd

    points: 2
    Helpful Answer Positive Rating

rajashekar333

Newbie level 6
Joined
Sep 7, 2007
Messages
14
Helped
2
Reputation
4
Reaction score
1
Trophy points
1,283
Activity points
1,364
Hi, I got Spice simulation results for 6 bit TIQ ADC for sinusoidal input.But i could not get an idea to find INL,DNL,SNR,SNDR and EDOB.How to find all these in Matlab and how can i give spice outputs as input in Matlab.can you please explain for same in Detail.Thanks in adv.
 

muralicrl

Full Member level 5
Joined
Feb 6, 2008
Messages
289
Helped
53
Reputation
106
Reaction score
19
Trophy points
1,298
Location
Bangalore
Activity points
2,626
Hi,

Kindly see the attachment, it may be useful to you,

If you need more details, don't hesitate to contact me.

Regards,

N.Muralidhara
CRL-BEL
 

southwave

Newbie level 4
Joined
Oct 21, 2008
Messages
7
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,312
Can anyone show how to get SFDR an SNDR in detail?
 

lwjbh

Junior Member level 2
Joined
Apr 27, 2006
Messages
24
Helped
1
Reputation
2
Reaction score
1
Trophy points
1,283
Activity points
1,391
SFDR:10log(P_signal/P_maxharmonic)
SNDR:10log(P_signal/(P_harmonic+P_niose))
 

southwave

Newbie level 4
Joined
Oct 21, 2008
Messages
7
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,312
lwjbh said:
SFDR:10log(P_signal/P_maxharmonic)
SNDR:10log(P_signal/(P_harmonic+P_niose))
ThanKs
I mean how to use cadence's DFT function to measure SFDR and SNDR?
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top