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sachinagg77
Joined: 31 Jan 2006
Posts: 64
Helped: 7
Location: Japan
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 06 Dec 2007 2:15 Slew Rate |
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Hello
Can someone please explain the impact of load capacitor on the Slew Rate of a standard two stage op-amp?
In addition, can the use of cascoded miller compensation improve the slewrate performance of an op-amp?
I will appreciate if someone can point out the method to derive the slewrate formula for both cases.
Regards
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money_kandan2004
Joined: 24 Aug 2007
Posts: 310
Helped: 125
Location: india
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06 Dec 2007 4:45 Re: Slew Rate |
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better you this book
" Mixed signal VLSI Design "
by
Allen and holl berg
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spring1860
Joined: 02 Nov 2007
Posts: 94
Helped: 3
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06 Dec 2007 7:48 Re: Slew Rate |
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| pls , what is "cascoded miller compensation"?
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Google
AdSense
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06 Dec 2007 7:48 Ads |
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rajanarender_suram
Joined: 20 Jan 2006
Posts: 188
Helped: 15
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06 Dec 2007 9:28 Slew Rate |
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slew rate w.r.t. Load is Io/CL (Io is the current in 2nd stage, Cl is load cap)
Slew rate wrt to Cc (miller cap) is Iss/2Cc (Iss is tail current in Diff amp)
Slewrate of the Opamp will be the smaller of the two above slewrates
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hr_rezaee
Joined: 06 Oct 2004
Posts: 892
Helped: 88
Location: Iran-Mashhad
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06 Dec 2007 18:23 Slew Rate |
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Hi
see these papers:
"Am imporoved model for the slewing behavior of opamps" by Wang, Harjani
"An accurate analysis of slew rate for two-stage cmos opamps" by Yavari, Maghari, Shoaei
regards
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funnynypd
Joined: 09 May 2007
Posts: 918
Helped: 21
Location: USA & Canada
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06 Dec 2007 19:07 Slew Rate |
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| reduce noise and keep circuit stable.
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