Varactor (varicap) FV1043, equivalent in LTSPICE

  • Thread starter Thread starter michael1978
  • Start date Start date
  • Tags Tags
    Equivalent Ltspice
Click For Summary

Discussion Overview

The discussion revolves around finding an equivalent varactor diode for the FV1043 in LTSPICE, particularly for use in oscillators to change frequency. Participants seek assistance in identifying suitable models and troubleshooting issues related to frequency tuning.

Discussion Character

  • Exploratory
  • Technical explanation
  • Homework-related

Main Points Raised

  • One participant requests help in finding an equivalent varicap diode for the FV1043 in LTSPICE.
  • Another participant suggests searching for varactor models in SPICE and provides a link to a Google search for further resources.
  • Several participants express difficulty in finding a similar varactor diode and inquire about the relationship between varactor voltage changes and oscillator frequency changes.
  • One participant mentions a specific oscillator setup at 100 MHz using a tuning diode and questions why changing the varicap voltage does not affect the frequency.
  • A later reply indicates that one participant resolved their issue but does not specify how.

Areas of Agreement / Disagreement

The discussion shows a lack of consensus on the availability of an equivalent varactor diode in LTSPICE and the reasons behind the frequency not changing with voltage adjustments. Multiple viewpoints and uncertainties remain regarding the tuning process.

Contextual Notes

Participants express confusion about the relationship between varactor voltage and frequency output, indicating potential missing assumptions or dependencies on specific circuit configurations.

michael1978
Messages
434
Reaction score
19
Hello, everbody

can somebody help me to find equivalent varicap diode of FV1043, i can't find in ltspice FV1043
is for oscillator to change the frequency…..

thanks.
 
Engineering news on Phys.org
I did a Google search for Varactor in SPICE, and got lots of hits. Are any of these of help?

https://www.google.com/search?q=varactor+in+spice&ie=utf-8&oe=utf-8&client=firefox-b-1

Beyond that, you may need to tune up the model on your own. The 2nd book below (snapshot from Amazon) is my favorite book for such modeling:

upload_2018-11-20_7-15-18.png
 

Attachments

  • upload_2018-11-20_7-15-18.png
    upload_2018-11-20_7-15-18.png
    36.3 KB · Views: 1,372
i don't know to find similar:frown:
 
michael1978 said:
i don't know to find similar:frown:
Can somebody tell me, why he don't change the frequency, when i change the value of varactor diode battery, i don't know his name, he help to make the oscillator with varactor? do somebody know
 
AHhh Sir Balounce he make it for me oscillator 100MEGHZ, with tuning diode, but i try to change the voltage of varicap but frequency stay the same why? what for mistace i make:frown:
 
Hello i fix it, thnx………..
 

Similar threads

Creating a negative voltage rail for MOSFET driver
  • · Replies 5 ·
Replies
5
Views
2K
LTSpice functionalities regarding its Frequency Domain Analysis
  • · Replies 18 ·
Replies
18
Views
3K
Why Does My Varactor Diode Test Circuit Behave Differently on a Breadboard?
  • · Replies 93 ·
4
Replies
93
Views
8K
Spikes in LTspice voltages and currents
  • · Replies 11 ·
Replies
11
Views
3K
Hi, can somebody help to measure varicap diode
  • · Replies 6 ·
Replies
6
Views
3K
Hello, how can I replace a variable capacitor with a varicap
  • · Replies 49 ·
2
Replies
49
Views
10K
Gain limiter circuit in LTspice - current flowing in wrong direction
  • · Replies 7 ·
Replies
7
Views
3K
Trouble building a Buck Converter
  • · Replies 14 ·
Replies
14
Views
2K
Why Is My Common Mode Current Simulation in LTSpice Incorrect?
  • · Replies 26 ·
Replies
26
Views
5K
3N187, where to find this type of MOSFET in LTSpice
  • · Replies 13 ·
Replies
13
Views
3K