Analog Circuit Design Laboratory Report - MyWeb at WIT ...
Analog Circuit Design Laboratory Report - MyWeb at WIT ...
Analog Circuit Design Laboratory Report - MyWeb at WIT ...
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
The 10-kΩ potentiometer was then adjusted for a differential gain ADIFF of 100.<br />
Again using Equ<strong>at</strong>ion 10 VO was predicted to be 1.0 V. VO was measured as 970 mV,<br />
which is within 3% of the predicted value.<br />
The circuit was then modified as shown in Figure 33 to determine the common-<br />
mode voltage gain ACM with both input being connected to E2. ECM, equal to E2, was<br />
then measured to be 452mV. VOCM was then measured as 0.12mV.<br />
Figure 33 – Measurement of CMRR<br />
Using Equ<strong>at</strong>ion 11 ACM was calcul<strong>at</strong>ed to be 6.64 x 10 -6 . CMRR was calcul<strong>at</strong>ed a using<br />
Equ<strong>at</strong>ion 12 to be 150,666. CMRR was then converted to dB units using Equ<strong>at</strong>ion 13.<br />
CMRR(dB) equals 103.5, which is significantly lower than the typical d<strong>at</strong>a sheet value.<br />
The typical d<strong>at</strong>a sheet value shows CMRR(dB) to be 130 when ADIFF is equal to 100.<br />
39
Change language