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planar spiral antenna
I can not understand how four beams are formed from sum mode and diference mode.In addition, how the four beams are processed to obtain the elevation angle and azimuth angle?who can give me some guidance?thanks!
Re: LoadPull
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How to determinate the field within which we can change the impedance,for example,how to choose the value of s11_rho and s11_center in the following image?
[url=https://obrazki.elektroda.pl/84_1180528368.jpg[/url]
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The...
It seems that Load Pull is one of the most useful conception in the RF Power Amplifier.I am confused with Load Pull for a long time.What's it?Anybody who can give me some explanation?Thanks!
a good paper
Anybody who could supply the paper "Accurate Phase Noise Prediction in PLL Frequency Synthesizers (Part 1)",written by Lascari Lance?I have purchased the second part of the article, while cannot find the first. Thanks!!
active filter pll
Hi,for the fourth order active loop filter shown below, how to calculate the value of C3 , R3, R4? In the book ‘PLL Performance, Simulation, and Design 3rd Edition’ written by Dean Banerjee, it gives that C3=C4*4T3*T4/(T3-T4)^2 ,R3=(T3+T4)/(2*C4) , R3=(T3+T4)/[2*(C3-C4)],but...
active loop filter
I have two questions:
First,when I have known loop badwidth and phase margin,how to determin the components values?how to get an expression of the loop filter transfunction?
Second,how to select the OP-amp?what role does the op-amp play?what effect on PLL performance does...
Hi everybody,I'm aways confused with the loop filter design in PLL,especially the active filter.Who can give me some advices or recommend some books or papers?
Thanks!
Re: a little question
Please check the circuits.
That’s the one in which the inverter have been mentioned above .I have the following questions:
First of all, what role does the inverter play? Does it transform the sine wave to square wave? Second, What role does the R3 play? How can I decide...
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