Modified operational transconductance amplifier macromodel application in piezoelectric active filter design

Abstract

A modified macromodel of operational transconductance amplifier is proposed for application in design of high-frequency bandpass active filters based on film bulk acoustic resonators. The presented solution is an optimal tradeoff according to the criteria of completeness of simulated characteristics, its accuracy and calculation time. Nonlinear amplification behavior of the macromodel is modelled by minimax Chebyshev approximation which allows the use of highorder polynomials and solves the convergence challenge. At the same time, bias-dependent noise model accounts for JohnsonNyquist and flicker noise sources enabling the evaluation of active filter's signal-to-noise ratio, noise figure and output dynamic range. Finally, the differential active filter circuit was analyzed to validate the macromodel's capabilities, simulation ranges and filter characteristics.

Filter realization technique based on gyrator-resonator circuit replacement

“…Input decoupling of the circuit was implemented by means of fully differential OTA. The application features of OTA in active filter design was discussed in details in [10].…”

A 0.5-V Four-Stage Amplifier Using Cross-Feedforward Positive Feedback Frequency Compensation

“…This reduced spike will not overdrive the subsequent stage, thus does not jeopardize the amplification in the next circuit stage. In this way, it is economical to remove the conventional transconductance smoothing circuits [23][24][25]. This is particularly useful because it offers simplicity whilst reducing the power consumption and complexity as well as avoiding a higher supply in conventional methods.…”

Digitally programmable modified current differencing transconductance amplifier in 40‐nm technology: design flow, parameter analyses and applications

“…One of the most popular and efficient modelling techniques for complex electronic devices is macro‐modelling [2, 3, 5, 18]. This methodology simplifies the structure of a circuit and only some of the most characteristic phenomena and parameters are represented using the basic circuit elements.…”

“…Fig. 5 illustrates a simple macro‐model of a SISO‐OTA [3, 18, 19], whereas Fig. 6 presents a macro model of a CDS.…”

“…The diagram ( Fig. 6) contains the controlled current sources (CCCS and VCCS), the capacitances of the current terminals (inputs n, p and output z), the capacitance and the resistance of the [18] IET Circuits Devices Syst., 2020, Vol. 14 Iss.…”