Electrical Engineering ⇒ Topic : Antilog Amplifier
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Gaurav
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Antilog Amplifier The schematic diagram is shown in Figure (a). The voltage Vi at the non-inverting terminal of OP Amp 1 is:
Figure (a) Antilog amplifier. .......... (1) ............. (2) Therefore, from Eq. (1) and Eq. (2), it can be written as: ................ (3) The output voltage V2 of OP Amp 2 is given by Vo = IRf ........... (4) Substituting the value of I from Eq. (4) to Eq. (3), we obtain
................ (5) Equation (5) shows that Rf If appears as the scale factor that can be adjusted by changing either Rf or If. | |
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