what's the design consideration for Cout
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Posted by on August 8, 2008, 2:23 am
Please log in for more thread options Here is the question: if I want to switch AC and (AC+DC) signal from a high speed op-amp, the output load is 50 ohm, I want to put a capacitor between op-amp output and the 49.9 ohm resistor, how to choose the capacitance? thanks. | |||||||||||||||||||
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Posted by Michael A. Terrell on August 8, 2008, 4:37 am
Please log in for more thread options bigcaboy@gmail.com wrote: What is the maximum frequency? -- http://improve-usenet.org/index.html If you have broadband, your ISP may have a NNTP news server included in your account: http://www.usenettools.net/ISP.htm Notice to all employees: In our continuing effort to conform to political correctness, we must insist that all employees call a spade a shovel. That is all. | |||||||||||||||||||
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Posted by Michael A. Terrell on August 8, 2008, 4:38 am
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bigcaboy@gmail.com wrote: >
> Here is the question: if I want to switch AC and (AC+DC) signal from a > high speed op-amp, the output load is 50 ohm, I want to put a > capacitor between op-amp output and the 49.9 ohm resistor, how to > choose the capacitance? > > thanks. What is the minimum & maximum frequency? If you want DC you can't use a capacitor. In that case, use a split +/- supply and reference the op amp to ground. -- http://improve-usenet.org/index.html If you have broadband, your ISP may have a NNTP news server included in your account: http://www.usenettools.net/ISP.htm Notice to all employees: In our continuing effort to conform to political correctness, we must insist that all employees call a spade a shovel. That is all. | |||||||||||||||||||
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Posted by Eeyore on August 8, 2008, 7:30 am
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bigcaboy@gmail.com wrote: > Here is the question: if I want to switch AC and (AC+DC) signal from a
> high speed op-amp, Do you mean *couple* not switch ? Your question isn't clear. Graham | |||||||||||||||||||
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Posted by on August 9, 2008, 4:00 pm
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sorry it's a "coupling" question. I don't want both signal at the same time. this is a TIA (transimpedance), bandwidth I designed was DC-122MHz, I could redesign upto 500MHz. The cap as far as I know is small package with low inductance, other than that I don't know. How to choose the capacitance? If it's a load it is a pole, but right now it 's in series with the transmission line, any hidden problem here? wrote: > bigca...@gmail.com wrote:
> > Here is the question: if I want to switch AC and (AC+DC) signal from a
> > high speed op-amp, >
> Do you mean *couple* not switch ? > > Your question isn't clear. > > Graham | |||||||||||||||||||
> Here is the question: if I want to switch AC and (AC+DC) signal from a
> high speed op-amp, the output load is 50 ohm, I want to put a
> capacitor between op-amp output and the 49.9 ohm resistor, how to
> choose the capacitance?
>
> thanks.