GS Is required to set up a drain current of 2.25 mA? 12. For a particular JFET, gm0 = 3200 µS. What is g„ when VGs = -4 V, given that VGS(off) =-8 V? %3D |
GS Is required to set up a drain current of 2.25 mA? 12. For a particular JFET, gm0 = 3200 µS. What is g„ when VGs = -4 V, given that VGS(off) =-8 V? %3D |
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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
Transcribed Image Text:### JFET Biasing
**Figure Explanation:**
The diagram shows a JFET circuit with a power supply (\(V_{DD}\)), an ammeter (\(A\)), and a voltmeter (\(V\)). A resistor (\(R_D = 4.7 \, k\Omega\)) is connected with the JFET to measure current and voltage characteristics.
**Text Transcription:**
1. **Problem 10:**
- The following parameters are obtained from a certain JFET datasheet: \(V_{GS(off)} = -8 \, \text{V}\) and \(I_{DSS} = 5 \, \text{mA}\).
- Determine the values of \(I_D\) for each value of \(V_{GS}\) ranging from 0 V to -8 V in 1 V steps.
- Plot the transfer characteristic curve from these data.
2. **Problem 11:**
- For the JFET in Problem 10, what value of \(V_{GS}\) is required to set up a drain current of 2.25 mA?
3. **Problem 12:**
- For a particular JFET, \(g_{m0} = 3200 \, \mu\text{S}\). What is \(g_m\) when \(V_{GS} = -4 \, \text{V}\), given that \(V_{GS(off)} = -8 \, \text{V}\)?
4. **Problem 13:**
- Determine the forward transconductance of a JFET biased at \(V_{GS} = -2 \, \text{V}\). From the datasheet, \(V_{GS(off)} = -7 \, \text{V}\) and \(g_m = 2000 \, \mu\text{S}\) at \(V_{GS} = 0 \, \text{V}\). Also determine the forward transfer conductance, \((S_{f})\).
5. **Problem 14:**
- A p-channel JFET datasheet shows that \(I_{GSS} = 5 \, \text{nA at} \, V_{GS} = 10 \, \text{V}\). Determine the input resistance.
6. **Problem 15:**
-

Transcribed Image Text:**Field-Effect Transistors (FETs)**
**Section 8-4: The Ohmic Region**
30. A certain JFET is biased in the ohmic region at \( V_{DS} = 0.8 \, V \) and \( I_D = 0.20 \, mA \). What is the drain-to-source resistance?
31. The Q-point of a JFET is varied from \( V_{DS} = 0.4 \, V \) and \( I_D = 0.15 \, mA \) to \( V_{DS} = 0.6 \, V \) and \( I_D = 0.45 \, mA \). Determine the range of \( R_{DS} \) values.
32. Determine the transconductance of a JFET biased at the origin given that \( g_{m0} = 1.5 \, mS \), \( V_{GS} = -1 \, V \), and \( V_{GS(off)} = -3.5 \, V \).
33. Determine the ac drain-to-source resistance of the JFET in Problem 32.
**Section 8-5: The MOSFET**
34. Draw the schematic symbols for n-channel and p-channel E-MOSFETs and D-MOSFETs.
35. Label the terminals.
36. In what mode is an n-channel D-MOSFET with a positive \( V_{GS} \) operating?
37. Describe the basic difference between an E-MOSFET and a D-MOSFET.
38. Explain why both types of MOSFETs have an extremely high input resistance at the gate.
**MOSFET Characteristics and Parameters**
39. The datasheet for an E-MOSFET reveals that \( I_{D(on)} = 10 \, mA \) at \( V_{GS} = -12 \, V \) and \( V_{GS(off)} = -3 \, V \). Find \( I_D \) when \( V_{GS} = -6 \, V \).
39. Determine \( I_DSS \), given \( I_D = 3 \, mA \), \( V_{GS} = -2 \, V \), and \( V_{GS(off)} = -10 \, V \).
40. The datas
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