PART 1: HAND CALCULATIONS

Note: If you changed your original Power Amp Project #1 design as the result of Lab #3

or other reason, then re-simulate the Power Amp circuit using the new circuit and

include here.

A. From project #1, list the following values in a Table. Use the Project #1 design with

standard resistor values (the one you built in the Lab #3 experiment).

1. Equivalent input resistance, Rin, for that power amp stage using your PSpice

results. Note: this value already includes the 64 ohm load.

ECE3124

2. Small Signal Gain. Use the PSpice value of small signal current gain for just the

Project #1 power amp stage.

Rev 0.0

Project #2 - Fall 2023 Class A Two-Stage Amplifier Design

3. VCC. You will be using the same DC voltage from the power amplifier (Project

#1) for this driver amplifier (Project #2)

B. Submit all hand calculations for your design. It is important to show how you decided

on your resistor values and DC operating conditions. Use B= 200 for all of the

following calculations.

C. What are your calculated DC transistor bias parameters? Make one table showing Ico

VBEQ, VCEQ, and PD for each transistor (hand calculations for this design and PSpice

parameters for project #1).

D. What is your total DC current, Ips, supplied from the DC voltage source? You can add the

total current for the hand calculations of this design and that of PSpice for Project #1.

E. What is your calculated small signal current gain, A;? Make a table of the calculated gain

for this driver (input) stage, the power amp stage (PSpice Project #1), and the combined

two-stage design (multiply the two gains together).

F. Using a value of B= 200, calculate your Input Resistance, Rin, for the complete two-stage

design. The calculated value will require that you include the small signal equivalent

models for both the driver and the power amp.

G. In a table, list the resistor values and associated power dissipation for all resistors in your

design. Split the table into resistors in the driver amplifier stage and the power amplifier

stage.

H. Submit the complete schematic of your two-stage design.