[sdiy] Inverting Amplifier as a Buffer Output.

pata at ieee.org pata at ieee.org
Wed Jun 23 03:19:23 CEST 2010


Hi Oscar and the Lists!

I use "A" usual.
Because output series resistor protects output terminal of OPA form
short circuit to any power supply lines and other noises such as serge
voltage from big power machines or lightning.

Ordinal OPAs such as 072, 741, 356 has output short circuit protection
against GND line, so "B" type protection is not so good or no need.

Though "B" has no output voltage loss, it is limit by OPA's supply and
output voltage range.

So I use prefer "A" than "B".

Taku

Oscar Salas wrote:
> Hello all, 
>  
> I have drawn below two different configurations of an inverting amplifier as buffer output:
> A) The feedback resistor is taped -before- the output resistor.
> B) The feedback resistor is taped -after- the output resistor.
> 
> The case A) has voltage drop when it is conected to another module input.
> This is solved in the case B) where there is not voltage drop. 
> So, it seems a better solution.
> 
> What advantages has the case A) versus the case B) if any?
> 
> 
>                              ----/\/\/\/\-------
>                              |                 |
> A)                           |                 |
>                              |  =              |
>                              |  =   =          |
>       -----------/\/\/\/\-------=  --   =      |
>                                 =           =-----------/\/\/\/\
>                             ----=  +    =
>                            |    =   =
>                            |    =
>                          __|__
> 
> 
> 
>                              ----/\/\/\/\----------------
>                              |                           |
> B)                           |                           |
>                              |  =                        |
>                              |  =   =                    |
>       -----------/\/\/\/\-------=  --   =                |
>                                 =           =---/\/\/\/\----------
>                             ----=  +    =
>                            |    =   =
>                            |    =
>                          __|__
> 
> 
>       
> 
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-- 
===================================================
KATAYAMA, Takuya
Muse Music Synthesizer Laboratory, Japan



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