Innovative Approach to Electronics DesignInnovative Approach to Electronics Design

The new version of SimOne 2.5 is now available

21.03.2016

What’s new in SimOne 2.5

Laplace sources

- Functional voltage and current sources, defined with Laplace transfer function are now moved to a separate component group in the Schematic. Each Laplace source has its own graphical symbol.

- New algorithms for convolution integral computation in Laplace sources have been added. Previously used algorithms get more manually chosen parameters.


Parameter Description Default value Unit
Laplace Laplace transfer function 1/(s + 1Meg)  
R Inner resistance 0 Ohm
NFFT Number of points used for Inverse Fourier Transform 8192
Window The interval of non-zero values of the transfer function in time-domain Tend sec
Tol Minimal absolulte value of the function in the convolution integral 0
Method

Numerical method for computation of Inverse Laplace Transform and the convolution integral. Three methods are available:

- SimOne — the original method

- IFT — Inverse Fourier Transform usage for ILT and trapezoidal rule for the convolution integral

- Euler — Fourier-series method with Euler summation for ILT and and trapezoidal rule for the convolution integral

SimOne  

- The transfer function can be given as a table of values. The special functions with “freq_” prefix are used for this.

Periodic Steady-State

Periodic Steady-State analysis has a new interface.

- Time interval for plotting the graphs is now set in number of periods. The default value is 10.

- The maximal time step is set with minimal number of steps per period, the default value of which is 20.

Piecewise Linear input signals

New parameters for Piecewise Linear (PWL) signals are available:

Parameter Description Default value
PWL_Method

PWL processing method

- Standard SPICE method

- SIMONE: tries to consider the PWL signal as points of some smooth signal

SIMONE
PWL_BPRELTOL Relative tolerance for SIMONE method comparison of PWL slopes 1
PWL_BPABSTOL Absolute tolerance for SIMONE method comparison of PWL slopes 1e-6

Graphs

- Graphs axes can be switched between Linear/Logarithmic scales

X axis in logarithmic scale

Main menu: Graph → Log X

Icon: 

Y axis in logarithmic scale

Main menu: Graph → Log X

Icon: 

- It is possible to choose the view area of graphs manulally:

Set the view borders for a group of traces

Main menu: Graph → View rectangle…

Icon:

- Grpahs can be imported from SimOne simulation data files.

Mathematical expressions

New functions for integral transforms are added:

laplace laplace(f(x), H(s)) — the convolution of f(x) with the transfer function H(s) given in s-domain. Uses SimOne method.
laplace_smn laplace_smn(f(x), H(s)) — same as laplace.
laplace_euler laplace_euler(f(x), H(s), mtol) — the convolution of f(x) with the transfer function H(s) given in s-domain. Uses Fourier-series method with Euler summation. Values f(x) < mtol are ignored.
laplace_ift laplace_ift(f(x), H(s), window, nfft, mtol) — the convolution of f(x) with the transfer function H(s) given in s-domain. Uses Inverse Fourier Transform. If window is specified, the frequency step is 0.5/window. The number of values used for IFT is equal to nfft. Values f(x) < mtol are ignored.
freq_db freq_db(f(x), w1, db1, deg1, …, wn, dbn, degn) — the convolution of f(x) with the transfer function given in frequency-domain with discrete points as [frequency w, magnitude in decibels; argument in degrees] triples.
freq_db_deg freq_db_deg(f(x), w1, db1, deg1, …, wn, dbn, degn) — same as freq_db.
freq_db_rad freq_db_deg(f(x), w1, db1, rad1, …, wn, dbn, radn) — the convolution of f(x) with the transfer function given in frequency-domain with discrete points as [frequency w, magnitude in decibels; argument in radians] triples
freq_ma freq_ma(f(x), w1, amp1, deg1, …, wn, ampn, degn) — the convolution of f(x) with the transfer function given in frequency-domain with discrete points as [frequency w, magnitude in absolute values; argument in degrees] triples.
freq_ma_deg freq_ma_deg(f(x), w1, amp1, deg1, …, wn, ampn, degn) — same as freq_ma.
freq_ma_rad freq_ma_rad(f(x), w1, amp1, rad1, …, wn, ampn, radn) — the convolution of f(x) with the transfer function given in frequency-domain with discrete points as [frequency w, magnitude in absolute values; argument in radians] triples.
freq_ri freq_ma_rad(f(x), w1, re1, im1, …, wn, ren, imn) — the convolution of f(x) with the transfer function given in frequency-domain with discrete points as [frequency w, real part, imaginary part] triples.

Bug fixes

- Laplace function in AC analysis is fixed

- Etc.

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