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Explain use of constant current source in diff amps. Give description of any one type.
written 6.9 years ago by gravatar for teamques10 teamques10 ★ 70k modified 3.8 years ago by gravatar for Sharad Sharad • 160
electronic devices and circuits
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4.5 years ago by teamques10 ★ 70k
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written 3.8 years ago by gravatar for Sharad Sharad • 160

Need of Constant Current Source:

For dual input balanced output, CMRR is given by following formula,

$CMRR=\frac{Ad}{Ac}=\frac{(re+2Re)}{re}$

Hence we can see that CMRR dependent on Re. To improve CMRR we need to increase Re. But Re cannot be increased to a great extent, since the dc current will decrease which …

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