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Hello,guys. Now I need use FPGA to generate the 12bit digital sinwave code (that mean the 12bit digital code restore to analog signal is a sinwavw)to control dac to test my dac SNR and SNDR, anyone can give me some suggestion how to generate this 12bit digital code use FPGA? thanks!
you must say clear how do you want to do use this opamp. And I suggest you go to www.analog.com to
chose this opamp ,the data sheet tell you what condition can use the opamp. Good lock
you can in you .sp file delete the option:
.option post=2(may be post)
because you start a plot graphic processing,you can don't start it ,that's ok ,you can tyr
op amp question
yes,it's a common source amplifier.it's also a inverter.you must understand that inverter is also a amplifer,it's classB amplifier.note:if v2 and in tied together it is a inverter.
voltage bandgap schematic
The AC test circuit is right ,I think !The you can see the point the LAC2 (the right of N2 )the phase margin and gain bandwidth (usually 0.1meg ~1meg)
I can tell you some rule :
1.IN many cmos circuit design book tell us ,at the UGBW,the phase margin will at least 45deg,but in our practice circuit ,the phase margin usually 60deg ,in some A/D circuit ,the Phase margin will 70~80 deg ;
2.AS a amp circuit ,you have to see the closed AC...
I think the circuit design is very important ,but the layout is also very very important!!Because class AB as a audio driver ,especial large power out,load res is 4 hom or 8 hom ,the parasitic resistor very easy up to 0.5 hom even 1hom ,which will seriously
degrade the performance.
And also...
unity gain bandwidth is the bandwith of amp when the gain is 0 dB(X1,no amplify) ;GBW is the amp closed work bandwidth ,there have a relation:1*UGBW=gain*GBW,wher "gain" is your amp circuit closed gain.
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