Simulation and modelling: macromodeling of operational amplifiers

Noren, K.V.; Tarakji, A.

doi:10.1109/101.621602

Cited by 5 publications

(4 citation statements)

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“…The SPICE subcircuit UA741 is a macromodel of a 741-type op-amp that is more extensive than the first-order model in Fig. 1(a) [11], [12]. The -sections in the internal stage of this model produce open-loop poles at 10.0 Hz, 1.0 MHz, and 10.0 MHz.…”

Section: B An Example Circuit For Spice Simulationmentioning

confidence: 99%

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A loop-breaking method for the analysis and simulation of feedback amplifiers

Russell

2002

IEEE Trans. Circuits Syst. I

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Two-circuit models for feedback subcircuits are developed from a modification to the two-port method of feedback amplifier analysis and are applied in a method to break the feedback loop. These models are terminally equivalent to linear and nonlinear subcircuits, have physically-disconnected topologies, and employ dependent sources to control lateral signal transfer with a switch-like on or off manner. With feedback subcircuits replaced by these models in a SPICE simulation, it is possible to keep the amplifier biased at its closed-loop dc operating point while it operates in an open-loop or a closed-loop ac configuration. Small-signal analysis of the amplifier's equivalent circuit yields exact expressions for open-loop and closed-loop response functions, and the loop-gain.

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Section: B An Example Circuit For Spice Simulationmentioning

confidence: 99%

“…However, in order to satisfy the operations in (11), this model is designed for the circuit modeling of linear two-ports only.…”

Section: B External-source Two-port Circuit Modelmentioning

confidence: 99%

A loop-breaking method for the analysis and simulation of feedback amplifiers

Russell

2002

IEEE Trans. Circuits Syst. I

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“…There are many kinds of OPAMP macro models have been developed in recent years. [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] There are some advantages using a macro model instead of the real OPAMP: (1). Reduction in simulation time.…”

Section: Introductionmentioning

confidence: 99%

“…As an enhanced operational amplifier (OPAMP) is the basic component of analog integrated circuit. There are many kinds of OPAMP macro models have been developed in recent years 3–17 . There are some advantages using a macro model instead of the real OPAMP: (1).…”

Section: Introductionmentioning

confidence: 99%

An enhanced operational amplifier macro model based on artificial neural network

Wei

Zhao

Wan

2022

Circuit Theory & Apps

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An enhanced operational amplifier (OPAMP) macro model based on artificial neural network (ANN) is developed for analog circuit simulation. The model uses ANN to capture the relation between the inputs and outputs (currents and voltages) of the circuit module. Both direct current (DC) and alternative current (AC) signals are considered in the model. By adopting the adaptive sampling algorithm, the amount of data required for model training can be significantly reduced and the accuracy of model fitting can be apparently improved. The model is also validated by the simulated data from OPAMP, Bandgap, and LDO circuits. Compared with SPICE model, enhanced ANN OPAMP macro model has nearly 8 times faster simulation speed without apparently degrading the model accuracy. The predictions made by the neural network are also compared to the experimental measurement results of LDO circuit fabricated in 0.18‐μm process. Both simulation and experimental results show the feasibility and accuracy of the proposed enhanced ANN OPAMP macro model.

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