In: Electrical Engineering
One transistor amplifier BJT 1.Design a single transistor amplifier BJT with appropriate coupling and bypassing capacitors. 2.Draw the DC equivalent circuit and find the Q point. Draw the AC equivalent circuit and find parameters of your full amplifier circuit (gain and input resistance) . 3.Simulate the FULL amplifier circuit in DC state, indicate the Q point on the diagram and compare with theoretical results. 4.Simulate the FULL amplifier circuit using appropriate sin input signal(s). Using the simulation results from the graph, find the same amplifier circuit parameters, and compare with theoretical result. Draw your conclusions.
Answer:
1)One transistor amplifier BJTDesign a single transistor amplifier BJT with appropriate coupling and bypassing capacitors.
The common emmiter RC couple amplifier one of the simplest and elementry transistor amplifier that can be made.
If designed properly this amplifier can provide excellent signal .
The circuit daigram of a single stage common emitter RC coupled amplifier using one transistor .
a) RC coupling single transistor
Capasitor c in is the input Dc decoupling capasitor which blocks any Dc component if it present in the input signal from reaching the Q1 base.
R1 and R2 are the biasing resistors this network provides the transistor Q1 s base with necessry bias voltage to drive it into thhe active region.
BJT o/p Charcteristics
So all parts of there input wave from with amplitude 0.7 V will be absent in the output
wave from
2) .Draw the DC equivalent circuit and find the Q point. Draw the AC equivalent circuit and find parameters of your full amplifier circuit (gain and input resistance) .
a) Dc equivalent for the BJT Amplifier
b) Dc Equivalent ckt
All capasitors in the original amplifier circuit are replced by open circuits disconnecting V1 , R1 and R3 from the circuit and living RE the transistor will be replaced by its DC model.
DC Q - point from the equalent circuit by using the appropriate large signal transistor model.
3) Simulate the FULL amplifier circuit in DC state, indicate the Q point on the diagram and compare with theoretical results.
A transistor amplifiers designed work in the activ region
A single stage Amplifier is disigned using voltage divider bias. In a voltage divider.
VB = VB = Vcc R2 / R1 +R2
4) Simulate the FULL amplifier circuit using appropriate sin input signal(s).
Assing the parameters for each and a very component using the function tool parameters / models and its option tool set parameters .
B) Transient analysis
DC sweep analysis In this types of analusis usually temoerature B the sweeping parameter.
The user has the Provision of sweepins parameters of.