By Topic

Transistor active filters using twin-T rejection networks

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $31
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

1 Author(s)
Bachmann, A.E. ; Swiss PTT, Research Laboratory, Bern, Switzerland

The introduction of a rejection-type network, such as a twin-T or a bridged-T, into the feedback loop of an amplifier leads to bandpass characteristics similar to those of single tuned circuits. It is possible to achieve highly selective circuits at very low frequencies, e.g. in the audio range, where high-Q-factor coils are usually physically large and expensive. Some basic circuits using a symmetrical twin-T network with R and C only in the feedback loop of a transistor amplifier are investigated. Results of measurements are given. Q-factors higher than 50 are obtained at a frequency of 600 c/s.

Published in:

Proceedings of the IEE - Part B: Radio and Electronic Engineering  (Volume:106 ,  Issue: 26 )