Q. In a CD amplifier,given Rs =4k?, µ=50 and rd= 35k μ. Find the voltage gain Av.
The voltage gain,
Av = Vo / Vi = µRs / (µ+1) Rs + rd = 50*4* (103 )/ (50+1)*4*103 + 35 * 103 = 0.836
The positive value indicates that Vo and Vi are in phase, further note that the gain is greater than one.