Some non-electrolytic capacitor types such as polyester generate distortion when they have a significant signal voltage across them. This can be avoided by using polypropylene or polystyrene types but they are larger and more expensive. I have previously shown that in 2nd-order Sallen & Key filters, both lowpass and highpass, only one of the two capacitors has to be of the expensive sort to obtain the same freedom of distortion achieved with two. The Geffe configuration allows 3rd and 4th-order filters to be realized economically in one stage, and it is shown that here too only one linear capacitor is required in both lowpass and highpass cases, saving a lot of money.
Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $33 for non-members and is free for AES members and E-Library subscribers.
The Engineering Briefs at this Convention were selected on the basis of a submitted synopsis, ensuring that they are of interest to AES members, and are not overly commercial. These briefs have been reproduced from the authors' advance manuscripts, without editing, corrections, or consideration by the Review Board. The AES takes no responsibility for their contents. Paper copies are not available, but any member can freely access these briefs. Members are encouraged to provide comments that enhance their usefulness.