+ Post New Thread
Results 1 to 4 of 4

22nd August 2019, 18:52 #1
 Join Date
 Jan 2016
 Posts
 41
 Helped
 3 / 3
 Points
 882
 Level
 6
Magnitude function analog circuit (square root of sum of two squares)
I have output of quadrature mixer and I need it's magnitude for current application. I want to build a circuit that does A = sqrt(I^2+Q^2), and it should also have duty cycle of 10%, so it should be triggered by that function.
Can someone point me to a resource (website, book, journal, etc.) that explains how to build it?

Advertisement

22nd August 2019, 19:26 #2
 Join Date
 Nov 2013
 Posts
 692
 Helped
 186 / 186
 Points
 4,690
 Level
 16
Re: Magnitude function analog circuit (square root of sum of two squares)
Not enough to multiply the I branch with the Q branch signal? The multiplied output's DC level should be rational with the I and Q magnitudes. RSSI operates this way usually.
Tell us more about the application, the operating frequency, and explain this please: "have duty cycle of 10%, so it should be triggered by that function" I don't get it what you mean on."Try SCE to AUX." /John Aaron/

Advertisement

22nd August 2019, 20:52 #3
 Join Date
 Jan 2016
 Posts
 41
 Helped
 3 / 3
 Points
 882
 Level
 6

Advertisement

23rd August 2019, 08:34 #4
 Join Date
 Jan 2008
 Location
 Bochum, Germany
 Posts
 45,288
 Helped
 13778 / 13778
 Points
 259,399
 Level
 100
Re: Magnitude function analog circuit (square root of sum of two squares)
In case of doubt, you'll implement the analog function blocks according to the given formula: squarer, sum, square root. In case you use single quadrant multiplier, absolute value will precede the squarer.
+ Post New Thread
Please login