[SI-LIST] Re: Instrumentation Amplifier-- Configuration..

The symptoms match CMIR violation.  CMIR TRULY extending to either 
supply rail is atypical. Only amplifiers with specially designed FEs 
actually extend to one rail the other or both.  There are many 
amplifiers particularly FET based that get close if you ignore 
performance degradation near the rails.  Read the data sheet very carefully.

Vivekkumar M-TLS,Chennai wrote:
> Hi Steve,
>
> Thanks for the instant reply. We are maintaining the desired CMIR mentioned 
> in the catalog.
>
> The following is the behavior:
>
> We Ground one of the inputs and apply voltage on the other in both cases 
> below.
>
> 1) The instrumentation amplifier operates in single supply voltage, 5V, the 
> voltage isn't as expected at the output.
> 2) Same amplifier is used again with the input voltage split into +2.5V at 
> Vcc+ and -2.5V at Vee-. In this config we are able to get our desired output.
>
> Regards
> Vivek
>
> -----Original Message-----
> From: steve weir [mailto:weirsi@xxxxxxxxxx] 
> Sent: Wednesday, June 24, 2009 3:34 PM
> To: Vivekkumar M-TLS,Chennai
> Cc: si-list@xxxxxxxxxxxxx
> Subject: Re: [SI-LIST] Instrumentation Amplifier-- Configuration..
>
> Any voltage within the CMIR may be applied to either input.
>
> Vivekkumar M-TLS,Chennai wrote:
>   
>> Dear All,
>> As you all know that the below is the circuit for the instrumentation 
>> amplifier.
>>
>> [http://wpcontent.answers.com/wikipedia/commons/thumb/6/66/Opampinstrumentation.svg/350px-Opampinstrumentation.svg.png]
>>
>> Please can anyone guide me whether the circuit will work if I ground one of 
>> the differential inputs.
>>
>> Like apply 1V at one of the inputs and ground the other differential input.
>>
>> Is this configuration advisable in a instrumentation amplifier or is there 
>> any trade offs.
>>
>> Please advise me.
>>
>> Regards
>> Vivek.
>>
>>
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