Passive compensation techniques to enhance bandwidth of CFOA based non-inverting amplifier

Kamath, D V (2015) Passive compensation techniques to enhance bandwidth of CFOA based non-inverting amplifier. In: World Conference on Applied Sciences, Engineering & Technology, 24-26 October 2015,, Kumamoto University, Japan.

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In this paper, we consider passive compensation techniques to enhance the bandwidth of current feedback operational amplifier (CFOA) based finite gain non-inverting voltage amplifier. The applicability of Bayard’s passive compensation schemes using capacitors for CFOA based non-inverting voltage amplifier is discussed. The use of feedback capacitor alone for realizing Butterworth response is shown to be not feasible. On other hand, the use of both feedforward and feedback capacitor for pole-zero cancellation is shown to improve the bandwidth and the condition for the same has been derived. The use of feedforward capacitor alone is shown to be useful for achieving minimum phase error in the resulting frequency response. The proposed compensation techniques are attractive as they need one or two capacitors. The two-pole model considering the current mirror pole and the pole due to the output capacitance and resistance of the CFOA at z output and input resistance at x terminal have been considered in the analysis. The non-inverting voltage amplifier circuits using passive compensation techniques have been simulated in PSPICE using a behavioral macro-model as well as that of a practical macro-model of CFOA IC AD 844.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Current-feedback op-amp (CFOA), Passive compensation
Subjects: Engineering > MIT Manipal > Electronics and Communication
Depositing User: MIT Library
Date Deposited: 02 Nov 2016 10:32
Last Modified: 02 Nov 2016 10:32

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