A method for obtaining the transfer function of inverting and non-inverting op-amp circuits based on classical feedback theory

Narciso F. Macia, Vernon O. Blackledge

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    This paper presents an alternate approach for deriving the transfer function (gain, bandwidth) for both inverting and non-inverting Op-amp circuits. The approach uses classical feedback theory, in which the Op-amp circuit is represented in terms of its corresponding closed-loop, (feedback) block diagram. The characteristics of the Op-amp (open-loop), together with the equivalent transfer function of the accompanying circuit components, are incorporated into the classical, general feedback block diagram. The equivalent transfer functions (pre-filter and feedback) are obtained by means of superposition. Then, all the blocks are reduced into a single transfer function by means of the simplification formula: P(s)G(s)/(1+G(s)H(s)). The resulting transfer function shows the gain for each configuration (-R F/R A for the inverting Op-amp and 1+R F/R A for the non-inverting configuration) and bandwidth. It also shows that the Gain*Bandwidth product is constant for the non-inverting configuration, but not so for the inverting configuration. This approach is straightforward and insightful, specially for those students who have previously been exposed to feedback theory and who have backgrounds in fields other than electronics.

    Original languageEnglish (US)
    Title of host publicationASEE Annual Conference Proceedings
    Pages585-593
    Number of pages9
    StatePublished - 2001
    Event2001 ASEE Annual Conference and Exposition: Peppers, Papers, Pueblos and Professors - Albuquerque, NM, United States
    Duration: Jun 24 2001Jun 27 2001

    Other

    Other2001 ASEE Annual Conference and Exposition: Peppers, Papers, Pueblos and Professors
    CountryUnited States
    CityAlbuquerque, NM
    Period6/24/016/27/01

    ASJC Scopus subject areas

    • Engineering(all)

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  • Cite this

    Macia, N. F., & Blackledge, V. O. (2001). A method for obtaining the transfer function of inverting and non-inverting op-amp circuits based on classical feedback theory. In ASEE Annual Conference Proceedings (pp. 585-593)