A few things to note about the alternating current source, first pspice takes it to be a sine source, so if you want to simulate a cosine wave you need to add or subtract a 90 phase shift. Rc and rl transient examples in this tutorial, we will look at simulating rc and rl transients. Using wave files as input is pretty straightforward. Another approach would be to use a vco and a comparator.
Triangularsquarewave vco with lm600 pspice netlist. This source uses the pulsed voltage source to make a saw tooth wave. Wit solapur professional learning community 20,856 views 11. If you mean in orcad capture with pspice simulation enabled, then do the. Jun 08, 2017 the video explains the basics of a voltage pulse source to create various waveforms like square wave, triangle wave etc. So for a square wave, the value when the wave is low.
Notes for orcad pspice university of california, san diego. With the proper selection of values of fc and fm you should be able to get what you need, although the sweep wont be linear or logarithmic. A wave output screen will appear, since we didnt not select anything to view it will be. If we choose tr too large, the function does not look like a square wave. There are various ways of accomplishing this, from the menu select pspice and then select run. Triangularsquarewave vco with lm600 pspice netlist all. Spicesimulation using ltspice iv reverse engineering. Aug 01, 2019 what do you mean by pspice, because its different in the coding interface vs using capture with pspice enabled. When the source is placed in a schematic, select the pulse tab. The software is already installed in the computer of every station.
The vexp voltage source generates a waveform as shown in figure 5, where tc1 and tc2 are the time constants of the rising and falling exponentials, respectively. Altium techdocs are online documentation for altium products, providing the basic information you need to get the most out of our tools. Transient analysis of square wave using pspice electrical. Explore 8 apps like pspice, all suggested and ranked by the alternativeto user community. Download the orcad lite software and discover how easy it is to use these stateoftheart orcad pcb design technologies. Finally, adding the 9th harmonic, the fifth sine wave voltage source in our circuit, we obtain this result. I am working on a virtual reality engine in electrical engineering and am trying to implement the work of a. Hi everyone, i am trying to simulate a square wave generator that uses an opamp configured as an astable multivibrator, but i cannot get an output and i am struggling to see why not. As to getting the pulse source to match the waveform you want, the waveform you are trying to simulate goes between. This source uses the pulsed voltage source to make a square wave. The video explains the basics of a voltage pulse source to create various waveforms like square wave, triangle wave etc. I dont know how to set the ltspice pulsed voltage source for those frequency square waves. Pspice square wave with different magnitude all about. When the sine signal is positive the output has to be 5v, when the sine.
Hi how can i generate a 10 khz square wave with ltspice. In reality, square waves have very small tr and tf. All three libraries can be installed at once by using the ctl key on the keyboard. Square wave as input signal functional verification. There are various voltage sources like vac, vdc, vexp, vpulse, vpwl, vsffm, vsin, vsrc, etc. Thus, for a given frequency we can set up the square function if we choose tr. In previous tutorials we have described the dc voltage source, vdc, and the sinusoidal voltage source, vsin. Around the spice kernel lot of people have programmed shells and programs for simple and intuitive usage and so you can find lot of software offers on the market. Pspice tutorial create a new project and select analog or mixed ad. Sep 07, 2018 popular open source alternatives to pspice for linux, windows, mac, web, software as a service saas and more. Download pspice for free and get all the cadence pspice models. Can anyone please let me know what that means and how i need to correct this problem. But the more important version for the normal user is pspice spice for the pc.
Popular open source alternatives to pspice for linux, windows, mac, web, software as a service saas and more. It is a generic explanation which can be used in any circuit simulation. If you mean in orcad capture with pspice simulation enabled, then do the following. Square wave as input signal functional verification cadence. It simulates complex mixedsignal designs containing both analog and digital parts, and it supports a wide range of simulation models such as igbts, pulse width modulators, dacs, and adcs.
How can i develop a program that uses pulse width modulation to control the. Instead of using a traditional voltage source as input for your circuit, replace the voltage expression with a wave file expression. Having trouble generating a square wave in ltspice. These include the independent dc and ac voltage and current sources, and the simple voltage or current controlled dependent voltage and current sources. Measuring frequency with ltspice electronics forum. Download a free trial to find out which altium software best suits your needs. Introduction spice simulation program with integrated circuit emphasis is a. Robinson never explained in detail how to create and run a circuit in pspice. This source uses the pulsed voltage source to make a triangle wave.
Use an sffm voltage source followed by a comparator. Also pspice is a simulation program that models the behavior of a circuit. All three libraries can be installed at once by using the ctl key on the keyboard when selecting the library with the mouse. A voltage pulse or pulse train can be applied as an independent source in pspice using vexp. Vpulse pulse voltage source model online documentation. The values you type in for v1 and v2 will depend on the amplitude specified on the. It was the first time i heard and work with the pspice software. How to properly create a square waveform with spice. The simplified model of the gpm consists of an highvoltage source u, a charging resistor rc, an energy storage capacitor cc. The tr and tf parameters will define the rise and fall times of the.
Cadence pspice ad is the defacto industrystandard spicebased simulator for system design. A new window pop up with the pspice project type, select create a blank project and click ok. Ltspice is extremely versatile in terms of input its even possible to take your input from a wave file and pipe the output to another wave file, which is great if youre building audio amplifiers. Also for a pspice square wave voltage source, the parameters are. The original circuit had a sinusoidal input 9 cos 2t. Introduction to pspice objectives a primary purpose of this lab is for you to become familiar with the use of pspice and to learn to use it to assist you in the analysis of circuits. Discover features you didnt know existed and get the most out of those you already know about. Cadence pspice technology offers more than 33,000 models covering various types of devices that are included in the pspice software. Pspice square wave with different magnitude thanks for replying me. Pspice student is sometimes distributed under different names, such as pspice student thinstalled. Cadence pspice technology offers more than 33,000 models covering various types of devices that are included. Spice3f5 models vsin sinusoidal voltage source model. When the voltage source create square waveform with pulse v1 v2 td tr tf pw per and the tstop of the transient simulation is not very high the timediv of t he oscilloscope is not too high. And unlike every others student in my circuit theory, i didnt take ee100, which offer for freshman student.
Hi all, i am trying to simulate in pspice schematics a square wave generator, output of which is fed to an integrator. I need a 125khz square wave to simulate my project. Now i just need to convert the input sine signals frequency. The end result of adding the first five odd harmonic waveforms together all at the proper amplitudes, of course is a close approximation of a square wave. I am working on a virtual reality engine in electrical engineering and am trying to implement the work of a function generator and an oscilloscope. Figure 1 shows the pspice schematic for a circuit that was analyzed in class. Most of the available programs are excellent, but huge. Vsin sinusoidal voltage source model online documentation.
Up to now, these tutorials have discussed only the most basic types of sources. I need a power supply that can generate different waveforms such as square, triangular, etc. Pspice software for simulating voltage and currents of a text file netlist of a electronics components such as resistors, capacitors, inductors, transisters, diodes, voltage and current sources, etc. To make a square wave with abrupt transitions, set tr and tf to be very small but not 0. Sum of 1st, 3rd, 5th, 7th and 9th harmonics approximates square wave. What do you mean by pspice, because its different in the coding interface vs using capture with pspice enabled. Im asking very little of pspice, but its incapable. When i simulate the circuit, it is paused, and it says that the supply currents failed to converge. The tutorial starts under the assumption that the demo version of pspice is installed on your computer. Vexp model the rl circuit shown above is modified to have an exponential input as shown in figure 6. It simulates complex mixedsignal designs containing both analog and digital parts, and it supports a wide range of simulation models such as igbts, pulse width modulators, dacs, and. Never use it for a frequency response study, because the probe plot will give inaccurate results.
From the source library, choose the vpulse source, as shown below, and place it in the. There are three values which pspice will allow you to alter, these being. Using wave files as inputoutput in ltspice electrostud. Aei power ic model library incorporates over 600 high fidelity timedomain pspice models for power electronic designs, giving. The platform used for the simulation is pspice but it can easily replicated in other spice simulation software. Instead of using a traditional voltage source as input for your circuit, replace the voltage expression with a wavefile expression. Orcad pspice designer suite pricing ema design automation. I need to do a transient analysis of my bjt cascode amplifier. Pspice defaults to the 9th harmonic unless you specify otherwise, but this still will allow you to decompose a square wave to see its components with sufficient detail. In each case we will want to observe voltages andor. This is your basic direct current voltage source that simulates a simple battery and allows you to specify the voltage value. Per period the time for one cycle of the pulse wave form. Basic screen there are three windows that are opened.
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