riyaz.vlsi
Junior Member level 2
Hello frnds, I am involve in design of current mode analog circuit and working on TSMC0.18um process (cadence). Pls tell me how to find ac current gain, if output current depends upon two or three input signals.
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1. Keep all DC input currents constant to attain a reasonable operating point
2. Attach a unit (1A) current source in parallel to the input from which you want to find the current gain
3. Run an ac analysis over your frequencies of interest
4. Plot the current gain (≙ output current) for this input. You can run this for every input.
It gives wrong curve when i am clicking one of three inputs.
Thanks but I did not get correct response, might be i am doing something wrong.Of course. Read my advice thoroughly. Point 4.
How could we help you, if you don't communicate what you were trying, and which results you got?I did not get correct response, might be i am doing something wrong.
Hello sir,How could we help you, if you don't communicate what you were trying, and which results you got?
... which input i must click to find gain response.
We're turning in circles, sorry. It doesn't help if you repeat the same old info. Show your design, tell which simulator you're using, and tell us, why you think you have to click an input to find the gain response!
So its probably the SPECTRE simulator. You didn't show your test bench nor tell which analysis you ran (ac, xf ?), nor if - and where - you added an ac current source input in order to measure the gain.
And I think you need a biquad specialist for your problem, not me, sorry.