26-09-2013, 03:28 PM
To verify the characteristics of RC Coupled Amplifier
INTRODUCTION
When a.c. signal is applied to the base of the first transistor, it is amplified and developed across the
out of the 1st stage. This amplified voltage is applied to the base of next stage through the coupling
capacitor Cc where it is further amplified and reappears across the out put of the second stage. Thus
the successive stages amplify the signal and the overall gain is raised to the desired level. Much
higher gains can be obtained by connecting a number of amplifier stages in succession (one after the
other). Resistance-capacitance (RC) coupling is most widely used to connect the output of first
stage to the input (base) of the second stage and so on. It is the most popular type of coupling
because it is cheap and provides a constant amplification over a wide range of frequencies. The
above shows the circuit arrangement of a two stage RC coupled CE mode transistor amplifier where
resistor R is used as a load and the capacitor C is used as a coupling element between the two stages
of the amplifier.