I have a simple RF section where I am trying to mix a 100Khz and a variable signal. Ranging around 98-102Khz. I need to build a mixer to get the difference of these frequencies. I wasn't sure what would be the best design or what to use? I was thinking about using Fets. I am new to this game so don't know a lot. The output will be fed to a low-pass filter to get rid of the addition of the two signals. I couldn't find any simple designs on the boards. Any help would be great.
Excetara2,
You might try posting your question on this forum:
electro-tech-online.com
Those guys are heavy into circuitry.
Larry
You might try posting your question on this forum:
electro-tech-online.com
Those guys are heavy into circuitry.
Larry
Hello
For mixing, you have to use a multiplier. By example, those kind of device works well :
http://www.analog.com/en/subCat/0,2879,773%5F862%5F0%5F%5F0%5F,00.html
Some explanations here :
http://en.wikipedia.org/wiki/Frequency_mixer
http://www.electronics.dit.ie/staff/ypanarin/Lecture Notes/DT021-4/7AnalogMultipliers.pdf
Some interestings readings can be found with your favorite search engine.
For mixing, you have to use a multiplier. By example, those kind of device works well :
http://www.analog.com/en/subCat/0,2879,773%5F862%5F0%5F%5F0%5F,00.html
Some explanations here :
http://en.wikipedia.org/wiki/Frequency_mixer
http://www.electronics.dit.ie/staff/ypanarin/Lecture Notes/DT021-4/7AnalogMultipliers.pdf
Some interestings readings can be found with your favorite search engine.
super simple answer: diode ring mixer. 4 schottky diodes and two easy to make toroid transformers. unit has 2 input ports and 1 output port. output port contains sum and difference frequencies, and a simple filter lets you select sum or difference. also known as a double balanced mixer.
a bipolar transistor or jfet would give you a mixer with gain, but requires a bit more finesse to design properly. the diode ring is a wideband design, the transistor mixer usually requires tuned circuits at the inputs and output.
a bipolar transistor or jfet would give you a mixer with gain, but requires a bit more finesse to design properly. the diode ring is a wideband design, the transistor mixer usually requires tuned circuits at the inputs and output.
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