1. how to onvert the amplifier gains between decibels and (unitless) ratios ?
for example
i) AV = 14.1 dB ; AV(ratio) =
ii) AI = 202 ; AI(dB) =
iii) AP = 15 dB ; AP(ratio) =

2. A BC177 is used in common emitter mode with a 4k7 collector resistor. If hie = 1k, hfe=125, hoe=20x10-6s
determine Rin, Rout, Ai, gm, Av
3. A JFET is used in common source mode with a 8k2 load resistor. If
gm = 30 mS and rds= 40 k ohm

determine Av

4. An amplifier without feedback produces a fundamental component of output voltage of 30 volts with second harmonic component B2 in the output of amplifiers due to non-linearity of 5% distortion content when input voltage VIN is 0.02 volts.
(a) Calculate the open loop gain of the amplifier.
(b) If 1% of the output is fed back to the input as a negative voltage series feedback,
calculate the magnitude of the output voltage.
(c) If the fundamental frequency component of the output voltage is maintained at 30 volts,
but the second harmonic distortion B2.F is reduced to 1%, calculate the input voltage.

 

1. Use the definition. If AV = 20* log(Vo/Vi), then 10^(AV/20) = Vo/Vi
It's High School Algebra, to do the same thing to both sides of an equation leaving it unchanged.

 

1. Use the definition. If AV = 20* log(Vo/Vi), then 10^(AV/20) = Vo/Vi
It's High School Algebra, to do the same thing to both sides of an equation leaving it unchanged.

thanks

 

Is AP a power ratio?