如何确定CT sigma-delta 调制器中电流舵DAC的电流大小

feynmancgz · 发表于 2013-4-26 00:54:30

回复 10# violet516

I know you use active-RC.
Actually, the current does not flow into the resistor, it flows into the integrator.
You can't avoid the voltage difference at the input of your OTA. It always exist.
One way to reduce it is to make Gm of you OTA larger. Another is to reduce the output swing of your integrator.

Delta-sigma modulator need time to work properly, which means the output signal in the first seveal hundred nanoseconds is not correct.
According to your describe, you have no input signal. But delta-sigma actually generate kind of random signal to represent your input signal. Why should you always see 1000 ?

nareshreddy · 发表于 2013-7-15 02:23:24

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jyhking · 发表于 2015-9-8 11:32:48

哈哈哈哈

a1054958688 · 发表于 2020-3-4 01:04:51

feynmancgz 发表于 2013-4-19 22:22
回复 3# violet516

你好，你的这个total是15还是2*15，由于idac是差分形式，我觉得应该是2*15*Rint*Iunit=reference*fbc!

jeffej · 发表于 2020-3-23 09:31:42

just learning, learn more here ~!!

jeffej · 发表于 2020-3-23 17:05:51

who can answer it?

[求助] 如何确定CT sigma-delta 调制器中电流舵DAC的电流大小

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