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Old 22nd June 2008, 09:38 PM   #1
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Default Passive BP filter sim results

I finally got a triode model working in LTspice so I thought I would play with a passive BP filter implementation. In general it looks right except that after the output buffer (CF) the HF roll off flattens off while the signal at the grid continues to fall as expected.

Any idea why this would be?

Schem in this post, output results in next one.
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File Type: pdf suboutpassivesch.pdf (12.6 KB, 8 views)
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Old 22nd June 2008, 09:39 PM   #2
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Old 22nd June 2008, 09:53 PM   #3
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BTW. Given the losses in the passive filter a gain stage at the input would make some sense but it is important that the total circuit not be inverting. Other than the LTP is there another VA stage that is non-inverting?
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