I/Q Demodulation and Analog Processing
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| Apr 5th 2018, 15:10 | |
WN8PTotal Topics: 0 Total Posts: 0 |
I am looking for information that gives the mathematics of the output for an I/Q demodulator for various signals, such as for AM: C(t) = [i squared (t) + q squared (t)]1/2 power. And how to implement using analog circuitry. |
| Apr 5th 2018, 17:43 | |
W1VTSuper Moderator Total Topics: 0 Total Posts: 0 |
Is this the math you want? http://ecee.colorado.edu/~mathys/ecen4652/pdf/lab08.pdf This page has references to AM Synchronous Demodulator Circuits http://user.netonecom.net/~swordman/Radio/ShortWaveRadio.htm |
| Apr 9th 2018, 00:00 | |
WN8PTotal Topics: 0 Total Posts: 0 |
Hi Zachary, Thanks for the links. The CU lab write up was what I was looking for and is complementary to EMRFD clause 9.2 Introduction to the Math. What I meant by how to implement using analog circuitry is how to implement a squaring function, a square root function, an arctan function, and a differentiation function using analog circuitry. |
| Apr 9th 2018, 07:56 | |
W1VTSuper Moderator Total Topics: 0 Total Posts: 0 |
http://www.analog.com/media/en/technical-documentation/data-sheets/AD538.pdf Here is a datasheet for a chip that does analog computations. https://www.electronics-tutorials.ws/opamp/opamp_7.html Explanation of analog differentiation. Also talks about the compromises needed to get a stable circuit. JAN 1987 - QST (PG. 18) Tandem Match--An Accurate Directional Wattmeter, The Author: Grebenkemper, John, KA3BLO Analog computation of SWR. http://www.arrl.org/arrl-periodicals-archive-search |
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