The document appears to be a midterm assignment for an Electronics II course at Southeast University, focusing on circuit design using operational amplifiers (op-amps). Here's a breakdown of the problems:

1. Three-stage Amplifier Design: You need to connect an LM124 quad op-amp as a three-stage amplifier with gains of +25, -22, and -35, using a 420-kΩ feedback resistor for all stages. Then, calculate the output voltage for an input of 80 μV.

2. Differential Amplifier Design: You're tasked with determining the output voltage of a circuit (Fig.1) and designing a Differential Amplifier to achieve the same output as Fig.1.

3. Offset Voltage Calculation: For a given op-amp circuit (Fig. 14.27), calculate the total offset voltage when the input offset voltage $V_{IO}$ is 4.5 mV and the input offset current $I_{IO}$ is 160 nA.

4. Conversion of Amplifier Types: You need to explain how to convert a difference amplifier into an inverting amplifier and an integrator. Additionally, sketch the output voltage of the differentiator for a given input (in Fig.3), with $v_o = 0$ at $t = 0$, and show detailed calculations.

---

Would you like help solving one of these problems? Let me know if you'd prefer a detailed explanation or further assistance.

Related questions:

1. How do you calculate the output voltage for a three-stage amplifier?
2. What is the principle behind designing a differential amplifier?
3. How does input offset voltage and current affect op-amp performance?
4. What is the difference between inverting and non-inverting amplifier circuits?
5. How do differentiators and integrators function in op-amp circuits?

Tip: When working with op-amp circuits, always check for the correct sign of the gain (positive or negative) to avoid incorrect phase behavior in the output.