A Unified Approach to the Bandwidth of Amplifying Stages

2005 ◽  
Vol 42 (4) ◽  
pp. 314-324
Author(s):  
Hugo Calleja
Keyword(s):  
Transfer Function ◽  
Operational Amplifier ◽  
Current Gain ◽  
Voltage Gain ◽  
Unified Approach ◽  
Actual Output ◽  
Feedback Networks ◽  
Bandwidth Analysis

This paper presents a unified approach to the bandwidth analysis of amplifying stages, whose transfer function can be a voltage gain, current gain, transconductance or transimpedance. It uses the technique that involves modelling the feedback networks as voltage dividers. It takes advantage of the fact that, if the network between the opamp's output, and the node where the actual output is taken is linear, then the bandwidths at both points are equal. Therefore, calculating the bandwidth at the output of the operational amplifier will yield the desired result.

scholarly journals Ionizing radiation influence on parameters of analog components of the master slice array МН2ХА030

Doklady BGUIR ◽  
2021 ◽  
Vol 19 (4) ◽  
pp. 52-60
Author(s):  
O. V. Dvornikov ◽  
V. A. Tchekhovski ◽  
V. L. Dziatlau ◽  
Y. D. Galkin ◽  
Nikolay N. Prokopenko
Keyword(s):  
Ionizing Radiation ◽  
Fast Electron ◽  
Operational Amplifier ◽  
Field Effect Transistors ◽  
Absorbed Dose ◽  
Current Gain ◽  
Test Time ◽  
Voltage Gain ◽  
Satisfactory Level ◽  
Offset Voltage

Structured arrays and master slice arrays are often used to reduce cost, design and test time for radiation hardened analog integrated circuits. One of such master slice arrays is МН2ХА030, which uses bipolar and junction field-effect transistors. The purpose of this article is to estimate the effect of ionizing radiation on the parameters of the operational amplifier OAmp2 and comparators ADComp1 and ADComp3 created on the МН2ХА030 master slice array. Еhe results of measurements of analog components after exposure to 60Co gamma quanta with an absorbed dose of up to 700 krad and a fast electron fluence of up to 2.9·1015 el./cm2 with an energy of 6 MeV are presented. The OAmp2 operational amplifier provides a satisfactory level of basic static parameters (input current, offset voltage, voltage gain) at a fast electron fluence of up to 3.7·1014 el./cm2 with an energy of 6 MeV. There are a decrease in the voltage gain and an increase in the offset voltage at electron fluence of greater than 1015 el./cm2. The latter can be caused by a decrease in the efficiency of the common-mode signal feedback integrated into operational amplifier with a significant drop in current gain of bipolar transistors. All considered analog components provide a satisfactory level of basic static parameters at a fast electron fluence of up to 3.7·1014 el./cm2 with an energy of 6 MeV and an absorbed dose of 60Co gamma quanta of at least 700 krad. It is assumed that resistance of OAmp2, ADComp1, ADComp3 to the action of 60Co gamma quanta is significantly higher and requires further research. The developed analog components can be used in signal reading devices required in front-end of sensors for space instrumentation and nuclear electronics.

scholarly journals Validation of Fractional-Order Lowpass Elliptic Responses of (1 + α)-Order Analog Filters

2018 ◽  
Vol 8 (12) ◽  
pp. 2603 ◽  
Author(s):  
David Kubanek ◽  
Todd Freeborn ◽  
Jaroslav Koton ◽  
Jan Dvorak
Keyword(s):  
Transfer Function ◽  
Least Squares ◽  
Fractional Order ◽  
Frequency Band ◽  
Operational Amplifier ◽  
Transfer Functions ◽  
Second Order ◽  
Experimental Results ◽  
Analog Filters ◽  
Lowpass Filter

In this paper, fractional-order transfer functions to approximate the passband and stopband ripple characteristics of a second-order elliptic lowpass filter are designed and validated. The necessary coefficients for these transfer functions are determined through the application of a least squares fitting process. These fittings are applied to symmetrical and asymmetrical frequency ranges to evaluate how the selected approximated frequency band impacts the determined coefficients using this process and the transfer function magnitude characteristics. MATLAB simulations of ( 1 + α ) order lowpass magnitude responses are given as examples with fractional steps from α = 0.1 to α = 0.9 and compared to the second-order elliptic response. Further, MATLAB simulations of the ( 1 + α ) = 1.25 and 1.75 using all sets of coefficients are given as examples to highlight their differences. Finally, the fractional-order filter responses were validated using both SPICE simulations and experimental results using two operational amplifier topologies realized with approximated fractional-order capacitors for ( 1 + α ) = 1.2 and 1.8 order filters.

Transfer-function Synthesis using an Operational Amplifier†

1967 ◽  
Vol 23 (4) ◽  
pp. 355-366 ◽  
Author(s):  
K. VENKATARAMANI ◽  
V. G. K. MURTI
Keyword(s):  
Transfer Function ◽  
Operational Amplifier

scholarly journals Sensitivity optimization of direct form realization of active-RC all-pole filters

2003 ◽  
Vol 16 (2) ◽  
pp. 259-271
Author(s):  
Ana Matovic ◽  
Marija Matovic
Keyword(s):  
Transfer Function ◽  
Closed Form ◽  
Operational Amplifier ◽  
Filter Design ◽  
Ladder Structure ◽  
Design Performance ◽  
Function Coefficient ◽  
Direct Form ◽  
Recursive Formulas ◽  
Necessary And Sufficient

In this paper, a procedure for direct form realization of Active-RC all-pole filters is presented. The filters are based on the resistance-capacitance ladder structure combined with the single operational amplifier and multiple feedback for complex pole realization. Recursive formulas have been developed that determine transfer function coefficients and derivation of transfer function coefficient with respect to filter components. These design equations are developed without knowing filter coefficients in terms of filter components in closed form, and they are necessary and sufficient for the filter design. Performance of these filters base been compared with the classical cascade form realization.

scholarly journals The miller operational amplifier’s settling response

2007 ◽  
Vol 5 (02) ◽  
Author(s):  
E. Ruí­z-May ◽  
F. Sandoval-Ibarra
Keyword(s):  
Mathematical Model ◽  
Transfer Function ◽  
Operational Amplifier ◽  
Fabrication Process ◽  
Design Parameters ◽  
Third Order ◽  
Design Rules ◽  
Model Based

This paper presents a third-order transfer function to model the settling response of the Miller operational amplifier. The amplifier was simulated (spice) and designed according to design rules of a standard 1.5μm CMOS fabrication process. The proposed mathematical model -based on design parameters under the designer’s control- is the best settling approach reported up to now.

A Unified Approach for H∞ Complementary Sensitivity Design of PID Controllers Applied to a DC Motor With Communication Delay

2009 ◽  
Author(s):  
T. Emami ◽  
J. M. Watkins
Keyword(s):  
Transfer Function ◽  
Frequency Response ◽  
Discrete Time ◽  
Continuous Time ◽  
Dc Motor ◽  
Communication Delay ◽  
Time Shift ◽  
Pid Controllers ◽  
Unified Approach ◽  
Experimental Frequency

In this paper a graphical technique is introduced for finding all continuous-time and discrete-time proportional integral derivative (PID) controllers that satisfy the discrete-time H∞ complementary sensitivity constraint of an arbitrary order transfer function with time delay. These problems can be solved by finding all achievable PID controllers that simultaneously stabilize the closed-loop characteristic polynomial and satisfy constraints defined by a set of related complex polynomials. The key advantage of this procedure is that this method depends only on the frequency response of the system. If the plant transfer function is given, the procedure is still appropriate. The delta operator is used to describe the discrete-time controllers because it not only possesses numerical properties superior to the discrete-time shift operator, but also converges to the continuous-time controller as the sampling period approaches zero. A unified approach allows us to use the same procedure for discrete-time and continuous-time complementary sensitivity design of PID controllers. The method is demonstrated by using the experimental frequency response of a DC motor with communication delay for H∞ complementary sensitivity design of PID controllers.

Theoretical Analysis of Power Transfer Performance of Primary and Secondary Compensation Topology of Inductive Coupled Power Transfer System

2012 ◽  
Vol 529 ◽  
pp. 43-48
Author(s):  
Xu Zhang ◽  
Guo Ying Meng
Keyword(s):  
Electromagnetic Induction ◽  
Transfer Efficiency ◽  
Current Gain ◽  
Transfer System ◽  
Voltage Gain ◽  
Power Transfer ◽  
Leakage Inductance ◽  
Loosely Coupled ◽  
Power Transfer Efficiency ◽  
Secondary Side

Inductive coupled power transfer system is based on the principle of electromagnetic induction to transfer power from the primary side to the secondary side of a loosely coupled transformer, which can transfer electricity wirelessly. The loosely coupled transformer has large leakage inductance, which reduces the power transfer efficiency. In order to reduce the leakage inductance, a capacitance is used at the primary side and secondary side of a loosely coupled transformer, which can increase the power transfer efficiency. For four different compensation structures, this paper analyses the coupling coefficient and the secondary quality factor’s influence on the voltage gain, current gain and transfer efficiency, and also compares different compensation structures

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