ENTC 3320 - PowerPoint PPT Presentation

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ENTC 3320

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ENTC 3320. Instrumentation Amplfiers. Improving the input resistance of amplifiers ... the inputs. Rin = infinity at both V1 and V2. Instrumentation Amplifier ... – PowerPoint PPT presentation

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Title: ENTC 3320


1
ENTC 3320
  • Instrumentation Amplfiers

2
Improving the input resistance of amplifiers
Add buffer amplifiers to the inputs Rin
infinity at both V1 and V2
3
Instrumentation Amplifier
4
The Buffer Amplifier
5
The Difference Amplifier
  • Using superposition, the output is due to an
    inverting amplifier and non-inverting amplifier.

6
The Difference Amplifier
  • The inverting amplifier produces
  • The non-inverting amplifier produces

7
  • The output is the sum of the outputs produced by
    each input.

8
(No Transcript)
9
  • For R2R3R4,
  • Quite often, R1 is a variable resistor that is
    used to set the gain and is denoted as Rg.
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