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jim Junior Member Offline Posts: 14	ramp generator Jul 04^th, 2005, 3:21am Hello all, I am trying to design a voltage ramp generator circuit. can anybody provide the paper and website about it? Thanks for your help! Best Regards jim
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qadeer New Member Offline Posts: 7	Re: ramp generator Reply #1 - Jul 12^th, 2005, 8:56am Hi Jim, what type of ramp generator you are looking for......I've used a ramp generator circuit earlier to control the slew rate of source follower. If you want I can help you out. Regards, Qadeer
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jim Junior Member Offline Posts: 14	Re: ramp generator Reply #2 - Jul 13^th, 2005, 3:00am Hi Qadeer , I use a ramp generator circuit for ADC, could you please give me the circuit or paper about it? Thank you very much ! Best Regards, Jim
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qadeer

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Posts: 7

Re: ramp generator
Reply #3 - Jul 13^th, 2005, 10:18pm

Jim,

The simlest way to design a ramp generator is to charge/discharge a fixed cap with contant dc current controlled with the help of switches. The main challenge is such designs to generate a precision current and matching. I would suggest you to look for following two papers.

A robust, load-insensitive pad driver
Dowlatabadi, A.B.;
IEEE Journal of Solid-State Circuits,
Volume 35, Issue 4, April 2000 Page(s):660 - 665

On-chip ramp generators for mixed-signal BIST and ADC self-test
Provost, B.; Sanchez-Sinencio, E.;
IEEE Journal of Solid-State Circuits,
Volume 38, Issue 2, Feb. 2003 Page(s):263 - 273

Hope they would help.
Best of luck.....

Regards,
Qadeer

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jim Junior Member Offline Posts: 14	Re: ramp generator Reply #4 - Jul 14^th, 2005, 12:36am Hi Qadeer, Thanks for your reply! It's a pity that I haven't a IEEE account, so I couldn't download paper from it . Could you please forward the two papers to me? email address: fujj_2003@163.com Thank you very much and best regards! Jim
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