Elettro::Linux

ac_analysis

2009-08-24T00:12:18+01:00

Level 2 Headline Four double-pole, low-pass LC-filters

dc_analysis

2009-08-22T22:16:23+01:00

In this section we will analyze the characteristics of some of the semiconductor devices used most. BJT output characteristic The output characteristics (Ic vs Vce) of a typical npn transistor simulated with NGSpice are shown in this paragraph. The various curves are distinguished from each other by the value of the base current (Ib).

diode_model

2009-08-23T01:46:01+01:00

Junction DC parameters Parameters Unit Default value Example Scale factor Bv → Reverse breakdown voltage V infinite 40.0 IBv → Current at breakdown voltage A 1.0e-3 1.0e-4 IKF → Forward knee current A 1.0e-3 1.0e-6 IK → Reverse knee current A 1.0e-3 1.0e-6 Is → Saturation current A 1.0e-14 1.0e-16 area Jsw → Sidewall saturation current A 1.0e-14 1.0e-15 perim. n → Emission coefficient -1 1.5 Rs → Ohmic resistance Ω 0 100 1/area Junction capacitance parame…

exponential_source

2009-11-11T16:15:35+01:00

In this section we will show indipendent Exponential source. It has this general form; exp(V1 V2 Td1 Tau1 Td2 Tau2) where the model parameters are shown in the below table: Parameters Default value Unit V1 (initial value) Ampere or Volt V2 (peak value) Ampere or Volt Td1 (rise delay) 0 second Tau1 (rise time constant) Tstep second Td2 (fall delay) Td1+Tstep second Tau2 (fall time constant) Tstep second The exponential form causes the voltage to be V1 for the first Td…

italian_version

2009-03-10T12:08:22+01:00

Questa guida mostra come installare un sistema RTAI (Real Time Application Interface) sulla distribuzione GNU/Linux Slackware; la guida include una profonda analisi sulla configurazione del kernel (in modalità testo e in modalità grafica) e su possibili ottimizzazioni per poter configurare al meglio il kernel per questi scopi.

ngspice

2009-10-30T22:54:50+01:00

Independent Voltage/Current sources First of all, to simulate circuits you will need some way to tell NGSpice what is “exciting” or supplying electrical power to the circuit. NGSpice allows generating independent voltage and current sources which supply a fixed voltage level or current flow. For example, a voltage source is like a lab-bench power supply. An independent source can be time variant and can also be simulated by a polynomial (e.g. a nonlinear source). These sources can be specified …

piece-wise_linear_source

2009-11-15T15:24:46+01:00

In this section we will show indipendent Piece-Wise linear source. It has this general form; pwl(T1 V1 ) where the model parameters are shown in the below table: Parameters Default value Unit Tn (time at corner) second Vn (value at corner) Ampere or Volt The Piece-Wise Linear (PWL) describes a piece-wise lienar waveform. Each pair of time-voltage/current (Tn Vn) values specifies a corner of the waveform. The voltage at times between corners is the linear i…

pulse

2009-10-30T23:12:11+01:00

Using the general time-domain response functions, it is easy to investigate typical problems such as step, impulse and other responses of various circuits. To simulate behaviour of circuits we will need to tell NGSpice what is “exciting” or supplying electrical power to the circuit. For this we will use, in this section, different types of independe…

pulse_source

2009-11-10T22:05:06+01:00

In this section we will show indipendent Pulse source. It has this general form; pulse(V1 V2 Td Tr Tf Pw Per) where: Parameters Default value Unit V1 (initial value) Volt or Ampere V2 (pulsed value) Volt or Ampere Tdelay (time) 0.0 second Trise (time) Tstep second Tfall (time) Tstep second Pw (pulse width) Tstop second Period Tstop second The pulse form causes the voltage to start at initial value V1 and stay there for Td seconds. Then, the voltage goes lineraly f…

rtai

2009-03-09T23:48:41+01:00

* RTAI on Mandriva (Italian version) * RTAI on Slackware (Italian version)

single-frequency_fm_source

2009-11-15T15:41:17+01:00

In this section we will show indipendent Single-Frequency FM source. It has this general form; sffm(Vo Va Fc Mi Fs) where the model parameters are shown in the below table: Parameters Default value Unit Vo (offset) Ampere or Volt Va (amplitude) Ampere or Volt Fc (carrier frequency) 1/Tstop Hz (Hertz) Mi (modulation index) Fs (modulation frequency) 1/Tstop Hz (Hertz) The Single-Frequency FM (SFFM) form causes that the shape of the waveform is described by the following e…

sinusoidal_input

2009-10-30T23:06:56+01:00

In this section we will use indipendent sinusoidal source. A resistive circuit The first and simplest circuit that will simulate is a voltage divider circuit with a sinusoidal voltage source. It consists of three resistors and a sinusoidal voltage generator. The aim will be to measure the voltage between each node relative to that reference (node …

sinusoidal_source

2009-11-10T22:23:28+01:00

In this section we will show indipendent Sinusoidal source. It has this general form; sin(Vo Va f Td Th) The model parameters are shown in the table below: Parameters Default value Unit Vo (offset) Ampere or Volt Va (amplitude) Ampere or Volt f (frequency) 1/Tstop Hz (hertz) Tdelay (time) 0.0 second Theta (damping factor) 0.0 1/second Where Vo and Va must be speciﬁed by the user then the sinusoidal form causes the voltage to start at Vo and stay there for Td seconds. Th…

start

2009-08-06T21:45:16+01:00

Welcome to ElettroLinux project Wiki. This section is dedicated to the documentation. In particular, it should grow into a resource of information for those who just started and defined on the web site ElettroLinux. In these pages this icon , that you should see at the top right of every pages, means that you can save the page on odt format to open (...and then to print and/or convert to pdf format) with OpenOffice.org.