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xz781122
Joined: 19 Nov 2004
Posts: 40
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 08 Dec 2004 15:05 about cnstant gm opamp |
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| in many papers if you want to design constant gm op-amp you must realize sqrt(Iq)+sqrt(In)=constant.but their design seems to make Iq+In=constant.why?
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nxing
Joined: 10 May 2004
Posts: 446
Helped: 12
Location: China
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| 10 Dec 2004 14:42 about cnstant gm opamp |
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| please go to more details, like which paper or give the schematic...
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watersky
Joined: 20 Aug 2004
Posts: 70
Helped: 2
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| 17 Dec 2004 13:40 about cnstant gm opamp |
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| the input is nmos and pmos,tail current is two pieces of 1:3.you can find papers about it.
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markty
Joined: 15 Dec 2004
Posts: 60
Helped: 2
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| 18 Dec 2004 2:52 about cnstant gm opamp |
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What do u mean by making Iq + In = constant?
Is it Ip + In?
I read some papers before, i rememberd that some voltage is constant. For current, it is always constant.
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chaitu2k
Joined: 27 Apr 2004
Posts: 58
Helped: 1
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| 23 Dec 2004 5:25 Re: about cnstant gm opamp |
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u may want to take a look at this
F. Silveira, D. Flandre, P. Jespers, "A gm/ID Based Methodology for the Design of CMOS Analog Circuits and its Application to the Synthesis of a Silicon-on-Insulator Micropower OTA", accepted for publication in the IEEE Journal of Solid-State Circuits.
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sunking
Joined: 25 May 2004
Posts: 914
Helped: 46
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| 25 Dec 2004 9:36 about cnstant gm opamp |
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You can refer to the papaer about "rail to rail".
Those paper in the board you can find many.
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kkoko
Joined: 07 Dec 2004
Posts: 22
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| 05 Jan 2005 19:24 Re: about cnstant gm opamp |
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| because Bn+Bp also is constant
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