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| To: | <[email protected]> |
|---|---|
| Subject: | Re: LF: Sound Card mic Impedance |
| From: | "James Moritz" <[email protected]> |
| Date: | Thu, 16 Dec 2010 23:51:17 -0000 |
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| In-reply-to: | <[email protected]> |
| References: | <FDCC39D43D974DED978401025DB874DF@lindavideo><[email protected]><F97BEB3D03B443448AD64A730E9CB7AB@JimPC><[email protected]> <[email protected]> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
Dear Andy, LF Group, G4JNT wrote: Have just being playing with AADE, to try to see why it pretends to be ableto do low pass filters with unequal impedances.......Which all seems totally and utterly pointless. Might just as well slug oneof the unequal impedances with an auxilliary R to make them equal, then design an equally terminated filter. Well you could do that, but the trouble is that adding more resistors is bound to require more signal power at the filter input for a given level at the filter output. Which in one way or another boils down to reduced gain, SNR, output intercept, or increased bias current, dissipation, component count etc. in the overall circuit. Apparently one advantage of doubly terminated filters is that they are less sensitive to component tolerances than an equivalent singly-terminated filter - but in many cases the practical difference is not that significant. Cheers, Jim Moritz 73 de M0BMU |
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