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Design >> RF Design >> why my signal can't return to zero after a buffer?
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Message started by henrytqy on Apr 3^rd, 2012, 7:56am

Title: why my signal can't return to zero after a buffer?
Post by henrytqy on Apr 3^rd, 2012, 7:56am

I have design a differential buffer which is called fT doubler. I choose the RBS(random bit stream)as my input. When checking output, I find that it can't return to zero(subtract the DC). I don't know how to solve this problem, since I don't know how is this phenomena come out.

Any help will be greatly appreciated!

Title: Re: why my signal can't return to zero after a buffer?
Post by loose-electron on Apr 3^rd, 2012, 9:42am

Post a schematic
Describe the problem

Nobody can read minds here.

Title: Re: why my signal can't return to zero after a buffer?
Post by henrytqy on Apr 3^rd, 2012, 7:26pm

I'am so sorry to make you feel confused. Here is my schematic and Vin/Vout(Because I can't copy it from the computer I do simulation, So I draw it myself)

Title: Re: why my signal can't return to zero after a buffer?
Post by henrytqy on Apr 3^rd, 2012, 7:36pm

The input signal from the last stage(differential) is a random-bit-stream with overshoot(Vpp=500mv). But the output can't return to zero(subtract DC).

My power supply is 1V.

Thanks a lot~