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Beardolphinaries
Joined: 21 Aug 2007
Posts: 42
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 28 Nov 2008 12:25 ads inductor simulation |
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Hi,
I am doing inductor design in ADS and met a problem.
I intended to design an inductor with patterned ground shield on polysilicon layer.
However, I don't know how to connet this shield to ground? Generally two internal ports are connected to the two ends of spiral inductor. And I draw the shield on poly layer. What else I should do?
Thanks for information.
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Beardolphinaries
Joined: 21 Aug 2007
Posts: 42
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02 Dec 2008 14:49 ads inductor |
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| any body did similar design before? I really need some help. Thanks a lot.
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BigBoss
Joined: 17 Nov 2001
Posts: 1039
Helped: 63
Location: Earth
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02 Dec 2008 21:47 Need help on inductor simulation in ADS |
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This shield generally consists of polysilicon and shouldbe connected to the ground by adding PO-M1 contact and M1 should be tied to the system ground.
Put single ended ports at metallic layer for each node including shielding port and simulate it.You will have 3 ports devices in simulation tesbench.In this testbench, connect associated shielding port directly to the ground or use an equivalent circuit that will represent metallic connection between your shield and real ground.
Connect one of the live port to the ground and make a simulation to find input impedance of the coil.Other live port will be used as observation port in the simulation.
Imaginary part of the this impedancewill be inductance, real part will represent series resistance.
By this way, you can find Q factor..
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02 Dec 2008 21:47 Ads |
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Beardolphinaries
Joined: 21 Aug 2007
Posts: 42
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03 Dec 2008 9:46 Re: Need help on inductor simulation in ADS |
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Thanks very much for the detailed explanation.
According to your reply, I need to create a symbol for the inductor layout and simulate this in the schematic window, is that what you mean?
However, can I simulate this in the layout window? I mean, what is 'ground' in layout window?
The momentum manual from Agilent said that the 'GND' is not recognized by momentum. Instead, seems that there is a kind of port called 'ground reference'.
Is this the one need to be used? I did try this, but seems doesn't work.
Have you met this before? Thanks a lot.
By the way, the 'live port' is one of the inductor ends, isn't it?
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