Gift: SPICE Double Balanced Mixer Component

In summary, someone posted a request for a mixer component in 2009 and for learning purposes, a .zip file containing a symbol, schematic, and .sub file for LTSpice was created. However, due to security risks, the forum now only allows individual files to be posted. The instructions for using the mixer include unzipping the file, placing the .sub and .asy files in the appropriate folders, and using a SPICE directive to include the subcircuit in the netlist. The post also includes a bonus tip for saving a "mixer template" for quick experiments.
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Sam Gallagher
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<< Mentor Note -- ZIP files are a security risk, and the file has been deleted. Please post the individual files instead. Thanks >>

I saw a post from 2009 of someone who needed a mixer component to play with. So for learning purposes I zipped a symbol, schematic, and .sub file together for LTSpice of the double balanced mixer that was given in that thread so that anyone that's learning about mixers or IQ modulation can play with it without dealing with a messy schematic!

Instructions:
  • Unzip the file

  • Place .sub file in your LTSpiceVI\lib\sub folder (for windows this is in Program Files(x86)*\LTC)
*If you're running 32 bit windows it's just program files

  • Place the .asy (symbol) file in your symbol folder (also found in lib I'm pretty sure)

In LTSPICE: (You'll have to do this when you want to use the mixer, because LTSpice is a pain sometimes)
  • Place the mixer symbol

  • Ctrl+right click, change "Value" row to "DBMixer"

  • Include the subcircuit in your netlist with a SPICE directive (.op button)
It should say ".lib DBMixer.sub"
Don't forget the .sub part.

  • Use the mixer!

  • Bonus tip: Save a file with the mixer all set up as "mixer template" and use that to start when you want to do a quick mixer experiment.
Use all the mixers you want, you crazy kids.

Example: Basic IQ modulation by mixing (which is multiplying) a sine wave by +1V and -1V (a square wave)
upload_2015-8-18_15-49-55.png


Until next time
~Sam Gallagher
 
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Due to the forum's policy on .zip files I can no longer post the files, sorry all.
 

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  • DBMixer.txt
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1. What is a double balanced mixer?

A double balanced mixer is a type of electronic component used in radio frequency (RF) and microwave systems. It is designed to combine two input signals while suppressing any undesired frequencies or signals. This results in a cleaner and more accurate output signal.

2. What is the purpose of a double balanced mixer?

The main purpose of a double balanced mixer is to perform frequency conversion, also known as heterodyning, in RF and microwave systems. It is commonly used in radio communication systems, radar systems, and other applications that require the mixing of two input signals.

3. How does a double balanced mixer work?

A double balanced mixer uses a combination of diodes and transformers to combine two input signals and produce an output signal. The diodes act as nonlinear elements, which helps to suppress any undesired frequencies. The transformers are used to isolate the input and output signals and provide impedance matching.

4. What are the advantages of using a double balanced mixer?

One of the main advantages of using a double balanced mixer is its ability to suppress unwanted frequencies and signals. This results in a cleaner and more accurate output signal. Additionally, double balanced mixers have a wide dynamic range, high linearity, and low noise figure, making them ideal for use in high-performance applications.

5. How is the SPICE model used in a double balanced mixer component?

The SPICE model is a mathematical representation of the electrical characteristics of a double balanced mixer component. It is used by engineers and scientists to simulate the behavior of the component in a circuit before it is physically built. This allows for efficient design and optimization of the circuit before it is manufactured.

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