transistor voltage amplifier

transistor voltage amplifier

Shown is a transistor voltage amplifier (common emitter structure). The structural feature is that the emitter (e) is grounded, the base (b) input
signal is amplified, and the collector (c) outputs a signal that is inverse to the input signal. There is a resistor corresponding to each electrode . The electrodes provide depression.
Among them, +vcc is the voltage source; the resistors RJ and R2 form a voltage dividing circuit, which provides a stable bias voltage to the base (b) through the voltage division. The
resistor code is the 榘 electrode resistor, and the AC output signal passes through the capacitor C3. Obtained from the load resistor; resistor. R4. It is
the negative feedback resistor on the emitter (e) , which is used to stabilize the operation of the amplifier. The larger the resistance value, the smaller the amplification factor of the entire amplifier ; the capacitor C1 is the input
coupling capacitor; the capacitor C3 is the output coupling capacitor ; The capacitor C2 connected in parallel with the resistor
R4 is a decoupling capacitor, which is equivalent to
AC short-circuiting the emitter (c) so that the AC signal has no negative feedback effect, thereby obtaining
a larger AC amplification factor.