Asap please ---### Bipolar Differential Amplifier Input Resistance Calculation#### Circuit Diagram ExplanationThe given circuit illustrates a bipolar differential amplifier consisting of four transistors, labeled Q1, Q2, Q3, and Q4. Additionally, there are resistors \( R_C \) and \( R_1 \), and a power supply marked as \( V_{CC} \).1. **Transistors:** - **Q1 and Q2** serve as the main differential pair. - **Q3 and Q4** are part of the current mirror circuit that provides biasing to the differential pair.2. **Resistors:** - **\( R_C \)** is connected to both collectors of transistors Q1 and Q2. - **\( R_1 \)** is connected to the emitter of transistor Q3.3. **Voltage Sources:** - **\( V_{CC} \)** is the supply voltage, providing 10V to the circuit. 4. **Parameters:** - **Transistor beta (β)** for Q1, Q2, and Q4 is given as 100. - **Base-emitter voltage \( V_{BE(on)} \)** is 0.7V #### Transistor and Component Configurations:- The differential input is denoted by \( V_{1} \) and \( V_{2} \), with \( V_o \) representing the output voltage.- The current mirror formed by Q3 and Q4 ensures that nearly identical currents flow through Q1 and Q2's emitters.#### Required Calculation:- *Input Resistance*: The task is to determine the input resistance value of the given bipolar differential amplifier circuit.#### Given Values:- \( V_{CC} = 10V \)- \( R_C = 1 k \Omega \)- \( R_1 = 10 k \Omega \)- \( \beta = 100 \)- \( V_{BE(on)} = 0.7V \)#### Analysis Approach:To determine the input resistance of the differential amplifier configuration, consider the small-signal model and analyze the voltage and current relationships for inputs \( V_1 \) and \( V_2 \).---This educational content provides a comprehensive understanding of the bipolar differential amplifier's input resistance calculation and outlines the specific elements and configurations used in this kind of circuit analysis.

Vcc = 10 V Rc = 1 kR1 = 10kVBE = 0.7 V

1. Determine the input resistance value of the bipolar differential am Vcc I Vcc VA K₂ x Q₁ Vcc IR ERI ول +K₂ Rc Q2/02 I B=100 Q433=100 cov Rc=1&2 R₁ = 10k2 = (00 ß= UBE(O₂) = 0,7V = = = Q₂ Q4.

1. Determine the input resistance value of the bipolar differential am Vcc I Vcc VA K₂ x Q₁ Vcc IR ERI ول +K₂ Rc Q2/02 I B=100 Q433=100 cov Rc=1&2 R₁ = 10k2 = (00 ß= UBE(O₂) = 0,7V = = = Q₂ Q4.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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### Bipolar Differential Amplifier Input Resistance Calculation

#### Circuit Diagram Explanation

The given circuit illustrates a bipolar differential amplifier consisting of four transistors, labeled Q1, Q2, Q3, and Q4. Additionally, there are resistors \( R_C \) and \( R_1 \), and a power supply marked as \( V_{CC} \).

1. **Transistors:**
- **Q1 and Q2** serve as the main differential pair.
- **Q3 and Q4** are part of the current mirror circuit that provides biasing to the differential pair.

2. **Resistors:**
- **\( R_C \)** is connected to both collectors of transistors Q1 and Q2.
- **\( R_1 \)** is connected to the emitter of transistor Q3.

3. **Voltage Sources:**
- **\( V_{CC} \)** is the supply voltage, providing 10V to the circuit.

4. **Parameters:**
- **Transistor beta (β)** for Q1, Q2, and Q4 is given as 100.
- **Base-emitter voltage \( V_{BE(on)} \)** is 0.7V

#### Transistor and Component Configurations:
- The differential input is denoted by \( V_{1} \) and \( V_{2} \), with \( V_o \) representing the output voltage.
- The current mirror formed by Q3 and Q4 ensures that nearly identical currents flow through Q1 and Q2's emitters.

#### Required Calculation:
- *Input Resistance*: The task is to determine the input resistance value of the given bipolar differential amplifier circuit.

#### Given Values:
- \( V_{CC} = 10V \)
- \( R_C = 1 k \Omega \)
- \( R_1 = 10 k \Omega \)
- \( \beta = 100 \)
- \( V_{BE(on)} = 0.7V \)

#### Analysis Approach:
To determine the input resistance of the differential amplifier configuration, consider the small-signal model and analyze the voltage and current relationships for inputs \( V_1 \) and \( V_2 \).

---

This educational content provides a comprehensive understanding of the bipolar differential amplifier's input resistance calculation and outlines the specific elements and configurations used in this kind of circuit analysis.

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