Exercise 4.7 An NPN amplifier and bandwidth issues
Given is the circuit schematic of an amplifier, see below.
-
a)
- The amplifier is driven by an ideal voltage source
and the circuit itself is unloaded. Derive an equation for the frequency dependent voltage gain
.
This equation includes the impedance of the capacitances - you cannot assume these to be
(near) zero.
-
b)
- Rewrite the previously derived equation into a standard form. This standard form lets you easily
get DC-gain, high-frequency gain, poles and zeros from the expression).
-
c)
- Draw a Bode plot (magnitude and phase) of this transfer, indicating the values of poles and
zeros (on the x-axis) and the level of the flat part (y-axis).