about the test of 8bit DAC, its snr is 55dB!

Status
Not open for further replies.
W

williamy

Member level 3
Joined
May 26, 2006
Messages
59
Helped
3
Reputation
6
Reaction score
2
Trophy points
1,288
Activity points
1,577
this DAC is current-steering, in test, the SNR of DAC in one aspect (sample and signal frequency is changed) exceed 50dB, but the SNR of ideal 8bit DAC is 50.
is it normal? or the test is wrong?
 

the 8 bit dac has 1/256 quantizing noise. so maximum signla to noise ratio will be
S/N max = 20 log 1 / (1/256) = 48dB
this means that S/N ratio at 8 bit DAC never exeed 48dB.
 

can you say something about your test environment?
 

About test environment: FPGA supply 14-bit digital signal---DAC process--return the output of DAC under test to FPGA, ADC in FPGA(12bit-ADI)output, then, FPGA collect the digital signal, using matlab, process it.
 

according the SNR formula, the SNR of 8-bit DAC or ADC is not bigger than 6.02*8+1.7. this formula should give the best SNR in ideal
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…