Page 118 - Op Amps Design, Applications, and Troubleshooting
P. 118
AC-Coupled Amplifier 101
Similar calculations for the output RC network of Figure 2.27(b) can now be
accomplished. First we find the reactance of C 0.
Next we compute the net impedance of R L and C 0.
Finally, the effective voltage gain (loss) of the R LC 0 network can be computed,
Equation (2.38).
The third portion of our overall gain calculation is the gain of the op amp circuit as
determined by R F and R/. We compute this using the gain formula of Equation
(2.28) presented for the direct coupled amplifier.
The effective overall gain at 800 hertz is found by multiplying the three individual
gains, as in Equation (2.39).
