Direct extraction of nonlinear FET Q-V functions from time domain large signal measurements

Comparison of HEMT non‐linear model extraction approaches based on small signal and on large signal measurements

“…Therefore, they cannot be considered as state functions. However, the Q i functions along the given ðV gs ðtÞ; V ds ðtÞÞ contour can be directly calculated [20] from the extracted C i just by using Equation (24) Consequently, the use of a single large signal measurement is enough for the extraction of both current and charge functions along the ðV gs ðtÞ; V ds ðtÞÞ contour defined in the gate and drain waveforms. This fact is true provided that the voltage waveforms fulfill the 180 degrees phase condition.…”

“…The time domain equations that define the two-port device model, expressed using the same notation as for the small signal case, are Then, Equations (14) and (15) Due to the two-dimensional dependence of the functions, the resolution of the time domain equations (20) and (21) is not straightforward. Nevertheless, it was shown [16][17][18][19] that the proper selection of the load presented to the device can overcome this problem and the system can exactly be solved.…”

Construction of behavioral models for microwave devices from time domain large-signal measurements to speed up high-level design simulations

“…Some examples of such modeling techniques include parametric equivalentcircuit model extraction [5][6][7] and black-box model identifications in the frequency domain [7,8].…”

Obtaining quasi-static models using a frequency domain extraction methodology

“…The current waveform (I T D (t)) throughout the whole time interval can be calculated by substituting (3) in Q D (in (2)) and in the corresponding equations for I D (see [8]). As the extraction method requires the spectrum of the response, the Fourier Transform provides these coefficients.…”