[SI-LIST] Re: Instrumentation Amplifier-- Configuration..
- From: "Vivekkumar M-TLS,Chennai" <Vivekkumarm@xxxxxx>
- To: steve weir <weirsi@xxxxxxxxxx>
- Date: Wed, 24 Jun 2009 16:09:56 +0530
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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