Analog Circuit Design Laboratory Report - MyWeb at WIT ...
Analog Circuit Design Laboratory Report - MyWeb at WIT ...
Analog Circuit Design Laboratory Report - MyWeb at WIT ...
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Figure 7– Instrument<strong>at</strong>ion Amplifier<br />
The r<strong>at</strong>io of the resistances, referred to as “a,” is given in Equ<strong>at</strong>ion 14. This value is then<br />
used the calcul<strong>at</strong>e ADIFF using Equ<strong>at</strong>ion 15.<br />
a = aR / R = Rg / R Eq. (14)<br />
ADIFF = 1 + 2 / a Eq. (15)<br />
Output voltage VO for the instrument<strong>at</strong>ion amplifier, given in Equ<strong>at</strong>ion 16, is equal to the<br />
differential voltage gain ADIFF times the voltage difference across the input terminals plus<br />
the reference voltage.<br />
VO = ADIFF *(E1 – E2) + Vref Eq. (16)<br />
The op-amp with its many configur<strong>at</strong>ions can be combined and used in several<br />
applic<strong>at</strong>ions of signal conditioning circuit design. Some applic<strong>at</strong>ions th<strong>at</strong> use a<br />
combin<strong>at</strong>ion of op-amp functions are a microprocessor-based d<strong>at</strong>a acquisition system,<br />
13
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