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The Designer's Guide Community Forum
https://designers-guide.org/forum/YaBB.pl Design >> RF Design >> Improve the AMP for the buffer or vice versa? https://designers-guide.org/forum/YaBB.pl?num=1334814279 Message started by henrytqy on Apr 18th, 2012, 10:44pm |
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Title: Improve the AMP for the buffer or vice versa? Post by henrytqy on Apr 18th, 2012, 10:44pm Hi guys I have designed an AMP, and also a buffer for test. But a large Cap is brought by the buffer, which is a problem and limits the BW. I have come up with an idea, Ind peaking in the last stage of the AMP to overcome it. Thinking it for twice, I feel the direction is a little wrong, which is that I change my AMP(what I want to design) to adapt the buffer(just for the measurement). What do you think of my idea? Any advice will be greatly appreciated! Thanks in advance~~~ |
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Title: Re: Improve the AMP for the buffer or vice versa? Post by aaron_do on Apr 19th, 2012, 8:10am I agree...your method sounds wrong. What kind of signal are you trying to measure? Aaron Btw, oscilloscopes use 10:1 probes to solve that issue...but maybe there is a better method in your case. |
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Title: Re: Improve the AMP for the buffer or vice versa? Post by henrytqy on Apr 22nd, 2012, 7:07am aaron_do wrote on Apr 19th, 2012, 8:10am:
Sorry to reply so late. My signal is a digital signal before the CDR ckt. Its swing may be as large as 1.5*VDD. But since the instrument has an impedence of 50 ohm, the driver must steer a large current, thus the large W/L. I don't understand the 10:1 probes in my case, could you please explain it more clearly. Thanks a lot~~~ |
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Title: Re: Improve the AMP for the buffer or vice versa? Post by aaron_do on Apr 22nd, 2012, 5:47pm If it is a digital signal, why don't you use a string of inverters getting larger towards the end? |
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