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.

when calculating the SNR of adc,should the bandwidth of noise be 1/2fsample?

Status
Not open for further replies.

alex_fd

Newbie level 4
Joined
Jul 22, 2010
Messages
7
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Location
CHINA
Activity points
1,362
when calculating the SNR of adc,should the bandwidth of noise be 1/2fsample?

when calculating the SNR of adc,if i want to calculate all the noise,should the bandwidth of noise be 1/2fsample?in the book,its said that the quantization noise of adc is distributed in the range from zero to 1/2fsample.and i have another question.when calculating the noise of a sigma delta adc from the output of its digital filter,should the integration bandwidth of noise be set to 0 to 1/2 of the clock frequency of the output digital code?
 

pancho_hideboo

Advanced Member level 5
Joined
Oct 21, 2006
Messages
2,856
Helped
765
Reputation
1,530
Reaction score
720
Trophy points
1,393
Location
Real Homeless
Activity points
17,451
Re: when calculating the SNR of adc,should the bandwidth of noise be 1/2fsample?

when calculating the noise of a sigma delta adc from the output of its digital filter,
should the integration bandwidth of noise be set to 0 to 1/2 of the clock frequency of the output digital code?
No.
It should be effective bandwidth of digital filter which is less than 1/2 of the clock frequency.
 

KlausST

Super Moderator
Staff member
Joined
Apr 17, 2014
Messages
19,271
Helped
4,269
Reputation
8,541
Reaction score
4,234
Trophy points
1,393
Activity points
127,921
Re: when calculating the SNR of adc,should the bandwidth of noise be 1/2fsample?

Hi,

many audio ADCs work with higher sampling rate, then they use digital filters, then they reduce the data rate.....
Thus 1/2 f more relates to the output data rate than to the true sampling rate.

--> I'd choose the bandwidth to the "typical bandwidth of interest of the ADC".

Klaus
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top