Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN: 9780133923605
Author: Robert L. Boylestad
Publisher: PEARSON
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Define the type of transistors and the region of operation (cut-off, linear, saturation) for each transistor. Assume Vdd = 3.3V and thresholds VTn = |VTp| = 1.4V . VDSATn = |VDSATp| = 1.0V . Explain your answer.

**Problem Statement:**

Define the type of transistors and the region of operation (cut-off, linear, saturation) for each transistor. Assume \( V_{dd} = 3.3V \) and thresholds \( V_{Tn} = |V_{Tp}| = 1.4V \). \( V_{DSATn} = |V_{DSATp}| = 1.0V \). Explain your answer.

**Diagrams:**

(a) A PMOS transistor with gate voltage at 1.5V, connected to a supply voltage of 3.3V.

(b) A PMOS transistor with both source and drain connected to \( V_{dd} \) (3.3V), and a gate voltage of 2.0V.

(c) An NMOS transistor where both drain and source are connected to \( V_{dd} \) (3.3V).

(d) A PMOS transistor with both source and drain connected to \( V_{dd} \) (3.3V).

**Analysis:**

- **Diagram (a):**
  - PMOS transistor
  - Gate Voltage (\( V_G \)) = 1.5V
  - Source Voltage (\( V_S \)) = 3.3V
  - Voltage Difference (\( V_{SG} \)) = 3.3V - 1.5V = 1.8V
  - Threshold Voltage (\( |V_{Tp}| \)) = 1.4V
  - Since \( V_{SG} > |V_{Tp}| \), the transistor is **on**.
  - Assuming \( V_D = V_{dd} = 3.3V \), \( V_{SD} = 3.3V - 3.3V = 0V \).
  - The PMOS is in **cut-off region** due to zero \( V_{SD} \).

- **Diagram (b):**
  - PMOS transistor
  - Gate Voltage (\( V_G \)) = 2.0V
  - Source Voltage (\( V_S \)) = 3.3V
  - Voltage Difference (\( V_{SG} \)) = 3.3V - 2.0V = 1.3V
  - Threshold Voltage (\( |V_{Tp}| \)) = 1.4V
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Transcribed Image Text:**Problem Statement:** Define the type of transistors and the region of operation (cut-off, linear, saturation) for each transistor. Assume \( V_{dd} = 3.3V \) and thresholds \( V_{Tn} = |V_{Tp}| = 1.4V \). \( V_{DSATn} = |V_{DSATp}| = 1.0V \). Explain your answer. **Diagrams:** (a) A PMOS transistor with gate voltage at 1.5V, connected to a supply voltage of 3.3V. (b) A PMOS transistor with both source and drain connected to \( V_{dd} \) (3.3V), and a gate voltage of 2.0V. (c) An NMOS transistor where both drain and source are connected to \( V_{dd} \) (3.3V). (d) A PMOS transistor with both source and drain connected to \( V_{dd} \) (3.3V). **Analysis:** - **Diagram (a):** - PMOS transistor - Gate Voltage (\( V_G \)) = 1.5V - Source Voltage (\( V_S \)) = 3.3V - Voltage Difference (\( V_{SG} \)) = 3.3V - 1.5V = 1.8V - Threshold Voltage (\( |V_{Tp}| \)) = 1.4V - Since \( V_{SG} > |V_{Tp}| \), the transistor is **on**. - Assuming \( V_D = V_{dd} = 3.3V \), \( V_{SD} = 3.3V - 3.3V = 0V \). - The PMOS is in **cut-off region** due to zero \( V_{SD} \). - **Diagram (b):** - PMOS transistor - Gate Voltage (\( V_G \)) = 2.0V - Source Voltage (\( V_S \)) = 3.3V - Voltage Difference (\( V_{SG} \)) = 3.3V - 2.0V = 1.3V - Threshold Voltage (\( |V_{Tp}| \)) = 1.4V
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