1
Views
0
CrossRef citations to date
0
Altmetric
Original Articles

L.F. Transistor Feedback Amplifier

Pages 471-490 | Received 13 Dec 1962, Published online: 21 Aug 2015
 

ABSTRACT

1.

If the feedback amplifier's circuit configuration allows its return ratio—Aβ to be expressed in factored form, the inherent poles and zeros contributing to its transmission characteristics are easily seen and could be employed for constructing a pole zero diagram. Such a diagram would indicate at once though not precisely, the locations of additional poles and zeros required to correct the Aβ characteristics in a desired manner. Further, if the correcting network's performance is also expressed in terms of their poles and zeros, then all that is required is to introduce the correcting networks having poles and zeros corresponding to the desired ones.

2.

The above method has been adopted for the design of a low frequency feedback amplifier with 27db. feedback and 45 db. of closed loop gain. Transfer ratios (current/voltage, etc.) of simple compensating networks have also been derived in terms of poles and zeros and network element values. These could readily be employed for the design of correcting networks possessing the specified values of poles and zeros.

3.

The above design method based on pole zero diagram could further be extended to embrace the plotting of the locus of the roots of return difference 1 + Aβ and used for locating the poles and zeros to yield maximally flat or any desired closed loop response with the required amount of feedback.

Reprints and Corporate Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

To request a reprint or corporate permissions for this article, please click on the relevant link below:

Academic Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

Obtain permissions instantly via Rightslink by clicking on the button below:

If you are unable to obtain permissions via Rightslink, please complete and submit this Permissions form. For more information, please visit our Permissions help page.