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High-Q inductor options (Read 10827 times)

loose-electron

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Re: High-Q inductor options
Reply #15 - Dec 15^th, 2011, 7:57pm

aaron_do wrote on Dec 14^th, 2011, 7:03pm:

Quote:

Bond wires can be inconsistent on the value due to the variance in the mounting, length and height above package ground.

Compared to on-chip inductors I guess that's true, but how much variation is typical?

thanks,
Aaron

Very dependent on the mechanics of the situation.
Saw one example using a bondwire iinductance where it all
worked nicely, and then they moved manufacturing to
a different facility. Total fail of the tuned circuit due to new center
point on tuning the device. (had trammed caps)

after talking with the assembly shop they could tweak it
and bring it back to center with adjustment on tension in the
bonding machine.

Sorry, no number available.

Jerry Twomey
www.effectiveelectrons.com
Read My Electronic Design Column Here
Contract IC-PCB-System Design - Analog, Mixed Signal, RF & Medical

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aaron_do

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Re: High-Q inductor options
Reply #16 - Dec 15^th, 2011, 9:22pm

Hi loose_electron,

I'll keep that in mind. Perhaps the variation is not so great, but it may require a little trial and error to get the right value.

In fact the way I normally model the bonding wire like a right-angle triangle with a missing bottom, and a little extension at the top. However, we managed to look at the cross section of the bondwire in question, and found it looked more like a semi-circle. So maybe some iteration is necessary.

cheers,
Aaron

there is no energy in matter other than that received from the environment - Nikola Tesla

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