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Old 16th September 2010, 11:14 AM   #121
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The input impedance of the jfets will be higher, due to transconductance being inferior to bjt. Input offset will also be higher with jfets due to mismatch between devices.

bjt input offset should be really close to zero, especially if you use dual matched monolitic (ssm2210 / 2220 for example).
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Old 16th September 2010, 11:40 AM   #122
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Quote:
Originally Posted by apolon34 View Post
The input impedance of the jfets will be higher, due to transconductance being inferior to bjt. Input offset will also be higher with jfets due to mismatch between devices.

bjt input offset should be really close to zero, especially if you use dual matched monolitic (ssm2210 / 2220 for example).
JFet JFet JFet
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Old 17th September 2010, 12:11 PM   #123
regal is offline regal  United States
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I don't have LTSPICE but I would think the outputs could be combine with a cascode and this servoed so that the coupling caps could be eliminated. Has anyone tried this?
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Old 17th September 2010, 01:22 PM   #124
EUVL is offline EUVL  Europe
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Post #3, 14.
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Old 17th September 2010, 01:40 PM   #125
regal is offline regal  United States
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Post #3, 14.
But you need differential in and get differential out. Adds tremendous amount of complexity and cost, which is fine for some (just not most of us.) But I was thinking a single ended design could be done without the caps.
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Old 17th September 2010, 06:42 PM   #126
juma is offline juma  Germany
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Originally Posted by regal View Post
I don't have LTSPICE but I would think the outputs could be combine with a cascode and this servoed so that the coupling caps could be eliminated. Has anyone tried this?
Since it's your idea, it would be only fair from you to make it work...
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Old 17th September 2010, 06:57 PM   #127
EUVL is offline EUVL  Europe
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What stops you from using one half (left or right) of the balanced circuit ?
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Old 18th September 2010, 01:59 AM   #128
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The symmetry police?



The Spanish Inquisition?

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Old 18th September 2010, 05:32 AM   #129
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> The symmetry police?

That is brilliant !!!


Patrick

Last edited by EUVL; 18th September 2010 at 05:38 AM.
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Old 18th September 2010, 05:35 AM   #130
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