**Prelab:**Using the BJT large signal model for the circuit in **Figure 1**, determine the \( V_{bb} \) voltage required to drive a collector current of \( I_c = 0.5 \) mA. Use \( R_B = 220 \) kΩ, \( R_C = 2.05 \) kΩ, \( R_E = 1.05 \) kΩ, and \( V_{cc} = 5 \)V. Assume \( I_S = 50 \) nA and \( \beta = 250 \). (Hint: Find \( V_{be} \) using \( I_c \), then use KVL to find \( V_{bb} \). Remember that \( I_b \) can be found using the \( I_c / \beta \) relationship.)---**Figure 1**: NPN BJT under DC Bias**Description of Diagram:**The diagram illustrates an NPN bipolar junction transistor (BJT) circuit under DC bias conditions. - The base of the transistor is connected to a resistor \( R_B \), and the other end is connected to the voltage source \( V_{bb} \).- The collector is connected to resistor \( R_C \), which is then connected to the positive terminal of the power supply voltage \( V_{cc} \). The negative terminal is grounded.- The emitter is connected to resistor \( R_E \), which is also grounded.- The BJT is shown with standard symbols: emitter, base, and collector.- The \( V_{cc} \) is the supply voltage, providing power to the circuit. This setup is used to study the biasing conditions necessary for the NPN BJT to operate with a specified collector current.

We will find out Vbe by given current then we will find out Vbb by krichoff's voltage law .

Prelab: Using the BJT large signal model for the circuit in Figure 1, determine the Vsb voltage required to drive a collector current of I, = 0.5 mA. Use Rp = 220 k2, Rc = 2.05 kN, RE = 1.05 kN, and Ve = 5V. Assume Is = 50nA and ß = 250. (Hint: Find Vbe using Ic, then use KVL to find Vbb, remember that Ib can be found using the Ic/ B relationship) ----- Rc Voc CC R RE bb Figure 1 NPN BJT under DC Bias

Prelab: Using the BJT large signal model for the circuit in Figure 1, determine the Vsb voltage required to drive a collector current of I, = 0.5 mA. Use Rp = 220 k2, Rc = 2.05 kN, RE = 1.05 kN, and Ve = 5V. Assume Is = 50nA and ß = 250. (Hint: Find Vbe using Ic, then use KVL to find Vbb, remember that Ib can be found using the Ic/ B relationship) ----- Rc Voc CC R RE bb Figure 1 NPN BJT under DC Bias

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Question

**Prelab:**

Using the BJT large signal model for the circuit in **Figure 1**, determine the \( V_{bb} \) voltage required to drive a collector current of \( I_c = 0.5 \) mA. Use \( R_B = 220 \) kΩ, \( R_C = 2.05 \) kΩ, \( R_E = 1.05 \) kΩ, and \( V_{cc} = 5 \)V. Assume \( I_S = 50 \) nA and \( \beta = 250 \). (Hint: Find \( V_{be} \) using \( I_c \), then use KVL to find \( V_{bb} \). Remember that \( I_b \) can be found using the \( I_c / \beta \) relationship.)

---

**Figure 1**: NPN BJT under DC Bias

**Description of Diagram:**

The diagram illustrates an NPN bipolar junction transistor (BJT) circuit under DC bias conditions.

- The base of the transistor is connected to a resistor \( R_B \), and the other end is connected to the voltage source \( V_{bb} \).
- The collector is connected to resistor \( R_C \), which is then connected to the positive terminal of the power supply voltage \( V_{cc} \). The negative terminal is grounded.
- The emitter is connected to resistor \( R_E \), which is also grounded.
- The BJT is shown with standard symbols: emitter, base, and collector.
- The \( V_{cc} \) is the supply voltage, providing power to the circuit.

This setup is used to study the biasing conditions necessary for the NPN BJT to operate with a specified collector current.

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