How Do You Model Stray Capacitance in JFET Amplifiers for Mid-Band Frequencies?

  • Thread starter student75
  • Start date
  • Tags
    Design
In summary, the conversation revolves around creating a small signal model for mid band frequencies for a provided circuit and observing the "stray capacitance" in the transistor using this model. The person asking for help is struggling to understand where to begin and what to do, and has attempted to search for resources online. They are encouraged to review their textbook and watch a specific video on YouTube for further guidance.
  • #1
student75
1
0

Homework Statement


Hello , I need to make a small signal model for mid band frequencies for the circuit I provided below.
I am also supposed to observe the "stray capacitance " in the transistor using this small signal model.


Homework Equations





The Attempt at a Solution



I know that the capacitors here act as short circuit.
The problem is I don't know where to start and what to do. I tried googling small signal model but I couldn't understand a thing.

Help will be greatly appreciated. Thanks.


[PLAIN]http://img691.imageshack.us/img691/2405/jfetamplifier.png
 
Last edited by a moderator:
Physics news on Phys.org
  • #2
Sounds like you need some more background. Is your textbook not providing the proper foundations? Youtube "JFET small signal model" and you will find a very good video posted by tarbidan that should help you get started.

BTW, welcome to PF. In order for us to provide the best kind of help, you should attempt a solution and ask specific questions.
 

FAQ: How Do You Model Stray Capacitance in JFET Amplifiers for Mid-Band Frequencies?

What is a JFET amplifier?

A JFET amplifier is a type of electronic amplifier that uses a junction field-effect transistor (JFET) as its active element. It is commonly used in audio and other low-frequency applications due to its high input impedance and low noise characteristics.

How does a JFET amplifier work?

A JFET amplifier works by using the voltage across the gate-source junction of the JFET to control the current flowing through the device. As the voltage at the gate varies, the resistance of the JFET changes, allowing more or less current to flow through the device.

What are the advantages of using a JFET amplifier?

Some advantages of using a JFET amplifier include high input impedance, low noise, and low distortion. They also have a wide bandwidth and are relatively easy to design and construct.

How do you design a JFET amplifier?

To design a JFET amplifier, you need to select an appropriate JFET with the desired characteristics, such as gain and input impedance. Then, you need to determine the desired gain and biasing conditions for the amplifier. Finally, you can use standard amplifier design equations and techniques to calculate the necessary resistor values and construct the circuit.

What are some common applications of JFET amplifiers?

JFET amplifiers are commonly used in audio equipment, such as preamplifiers and power amplifiers, due to their low noise and distortion. They are also used in instrumentation and measurement circuits, as well as in communication systems and RF circuits.

Similar threads

High power RF amplifier at fixed frequency
Replies
12
Views
2K
Stray/Parasitic Capacitance - Impacts phase velocity?
Replies
10
Views
2K
How Do You Calculate Capacitance for Split Capacitors in PhET Simulations?
Replies
3
Views
2K
What dominates the high-freq. behavior of a CS-amplifier?
Replies
1
Views
994
[Homework] Identify Filter type
Replies
4
Views
1K
How Do You Calculate Capacitance in a Series RC Circuit?
Replies
6
Views
4K
How Do You Determine the Equivalent Capacitance in Complex Circuits?
Replies
6
Views
2K
Archived How Do You Calculate Resonant Frequencies and Voltages in an RCL Circuit?
Replies
1
Views
6K
JFET, Mosfet, BJT Design Question
Replies
13
Views
2K
Capacitors in Hybrid-pi Model and Frequency Response
Replies
1
Views
3K

Hot Threads

Recent Insights

Back
Top