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看到几个模拟问题的解答,喜欢看的可以看看

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发表于 2015-8-15 02:07 AM | 显示全部楼层 |阅读模式
本文都从yahooanalogcoms_vlsi group 转载的

1关于运放cmrr问题
NO, when you are using opamp in inverting, i.e. there is no common
mode voltage if noninverting terminal is grounded so it not a
problem. If you use opamp in non inverign mode then only the applied
voltage become the common mode voltage and then we have to think of
CMRR.



Bansal.
_______________________________________________________________________

On Wed, 14 Jul 2004, [iso-8859-1] ajay dahiya wrote:

> Date: Wed, 14 Jul 2004 08:45:55 +0100 (BST)
> From: "[iso-8859-1] ajay dahiya"
> Reply-To: ASICDESIGN@yahoogroups.com
> To: ASICDESIGN@yahoogroups.com, analogcmos@yahoogroups.com
> Cc: analogcmos_vlsi@yahoogroups.com
> Subject: [ASICDESIGN] regading opamp
>
> hi all
>
>
> can someone clarify my doubt that
>
> Common mode rejection ratio is more important when we are using opamp
in inverting configuration.
>
> thans in advance
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 楼主| 发表于 2015-8-15 03:55 AM | 显示全部楼层
2Small Signal Model and Vx relation?

Daer jason
in the analys of the analog ircuits and when we aim to find the impedance of of the circuit between two points
we place an arbitrary voltage source Vx wich output a current Ix then by finding the relation between Vx and Ix we will able to find the impedance Z = Vx / Ix
note: (as a begining) in making this you should replace any non-linear device such as BJT or MOS with its linear model (Razavi didn't make this but you should make this to know where these equations of Ix and Vx come from)
----- Original Message -----
From: jason_class
To: analogcmos_vlsi@yahoogroups.com
Sent: Monday, August 09, 2004 11:43 AM
Subject: [analogcmos_vlsi] Small Signal Model and Vx relation?


Hello All

I am new to Analog electronics
I read a book titled Design of Analog IC by Behzad Razavi and some
problems in understanding some basic things which I need the help
fromthis group.
In the book, always the author use Vx and Ix when writing an small
signal equivalent circuit. May I know what is Vx and Ix and how do
we know when and where should we put the Vx. If anyone have read the
book, kindly answer my enquirries. I am from physics back ground and
do not understanding the correct procedure to draw a small signal
model for a bigger circuit and how to analyse it. If anyone has any
document or online resources that can help me, kindly let me know.
Thank you so much .

best regards and thanks
Jason

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