Vin For the circuit shown, draw the corresponding small signal model. Vcc Vcc Vcc W ww|ll R1 R2 WWW Q1 Q2 Re Idc Vo

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### Transcription for Educational Website

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**Title: Drawing the Small Signal Model for a Given Circuit**

**Introduction:**

In this tutorial, we will delve into the process of drawing the small signal model for the given circuit. This is a crucial step in analyzing and understanding the behavior of electronic circuits, especially in signal processing applications.

**Circuit Analysis:**

Let’s consider the circuit shown below where our primary goal is to draw the corresponding small signal model.

**[Image of Circuit Provided]**

**Components & Connections:**

The circuit comprises the following components:

1. **Resistors:**
   - **R1:** Connected between the supply voltage \( V_{cc} \) and the input point.
   - **R2:** Connected between the input point and the ground.
   - **Re:** Connected between the emitter of transistor Q2 and the ground.
   
2. **Capacitor:**
   - **C:** Connected between the input node (where \( V_{in} \) is applied) and the base of transistor Q2.
   
3. **Transistors (BJTs):**
   - **Q1:** NPN transistor with its collector connected to \( V_{cc} \) and its emitter connected to the collector of Q2.
   - **Q2:** NPN transistor with its emitter connected to the ground through resistor Re and its collector connected to the emitter of Q1.
   
4. **Current Source:**
   - **I_{dc}:** Connected between \( V_{cc} \) and the output node \( V_o \).

**Explanation of Connections:**

- The input signal \( V_{in} \) is applied at the common node of R1 and R2.
- The coupling capacitor C ensures that only the AC component of the input signal is passed to the base of Q2.
- The voltage supply \( V_{cc} \) is connected to the collectors of both transistors via the respective nodes.

**Objective:**

The task is to draw the small signal model corresponding to this setup.

**Small Signal Model Construction:**

To construct the small signal model, follow these general steps:

1. **Identify the AC equivalent circuit elements.**
   - Replace each transistor with its small signal equivalent (typically involving \( r_{\pi} \), \( g_m \), and \( r_o \))
   - Replace capacitors with short circuits (assuming high-frequency response).
   - Replace DC voltage sources with
Transcribed Image Text:### Transcription for Educational Website --- **Title: Drawing the Small Signal Model for a Given Circuit** **Introduction:** In this tutorial, we will delve into the process of drawing the small signal model for the given circuit. This is a crucial step in analyzing and understanding the behavior of electronic circuits, especially in signal processing applications. **Circuit Analysis:** Let’s consider the circuit shown below where our primary goal is to draw the corresponding small signal model. **[Image of Circuit Provided]** **Components & Connections:** The circuit comprises the following components: 1. **Resistors:** - **R1:** Connected between the supply voltage \( V_{cc} \) and the input point. - **R2:** Connected between the input point and the ground. - **Re:** Connected between the emitter of transistor Q2 and the ground. 2. **Capacitor:** - **C:** Connected between the input node (where \( V_{in} \) is applied) and the base of transistor Q2. 3. **Transistors (BJTs):** - **Q1:** NPN transistor with its collector connected to \( V_{cc} \) and its emitter connected to the collector of Q2. - **Q2:** NPN transistor with its emitter connected to the ground through resistor Re and its collector connected to the emitter of Q1. 4. **Current Source:** - **I_{dc}:** Connected between \( V_{cc} \) and the output node \( V_o \). **Explanation of Connections:** - The input signal \( V_{in} \) is applied at the common node of R1 and R2. - The coupling capacitor C ensures that only the AC component of the input signal is passed to the base of Q2. - The voltage supply \( V_{cc} \) is connected to the collectors of both transistors via the respective nodes. **Objective:** The task is to draw the small signal model corresponding to this setup. **Small Signal Model Construction:** To construct the small signal model, follow these general steps: 1. **Identify the AC equivalent circuit elements.** - Replace each transistor with its small signal equivalent (typically involving \( r_{\pi} \), \( g_m \), and \( r_o \)) - Replace capacitors with short circuits (assuming high-frequency response). - Replace DC voltage sources with
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