Ok, ive attach some pages from my pspice for analog communications that will show you how to use the abm parts to simulate a pll. The result shows that the input voltage of vco has small ripples when pll is locked. The circuitry depicted in figure 1 represents a mixed signal model of the 74hct4046 phase locked loop that is used for the practical exercises. Phase lock loop simulations 10 how a phaselocked loop works the phaselocked loop pll is a device with many interesting applications, including frequency synthesis, fm demodulation and television sweep circuits. The spice model now represents exactly the part and its measured s parameters. While the ltspice simulation took a bit of head scratching before it worked for me. Download a zip file containing the complete collection of demo circuits shown below. The video helps you in adding a custom digital logic components in ltspice to simulate basic digital combinational and sequential circuits.
An inverse riaa signal is used as an input, either as a passive predistorted signal, or as a laplace function of an ac voltage source download ltspice file. Twistersim is a unique electrothermal simulator that helps shorten the design solution cycle by enabling, in a few clicks, complex engineering evaluations with accurate simulations like loadcompatibility, wiring harness optimization, fault condition impact analysis, diagnostic behavior analysis and dynamic thermal performance. Virtual instruments allow you to select input waveforms. I dont know how to set the graph to show a time dependent plot with amplitude as y axys and time as x axys. St powerstudio is a dynamic electro thermal simulation software dedicated to power. Included in the download of ltspice are macromodels for a majority of analog devices switching regulators, amplifiers, as well as a library of devices for general circuit simulation. Cd4046 pll spice model or vco info needed electronics forum. Software description and features provided along with supporting. The transient response is evident in the plot of the control voltage i.
The phaselocked loop based circuits pll are widely used nowadays in various applications. Please submit your requests for additions or changes to undocumented ltspice on the discussion page second tab above ltspiceswitchercad iii is a complete and fully functional spice program electronic circuit simulator that is available free of charge from the linear technology corporation ltc. Hi all, im trying to simulate a boost converter for a constant current led driver, power factor corrected. Tis tinati software download help users get up and running faster, reducing time to market. The ltspice model of the piezoelectric transducer is a slightly modified adaptation of the spice model, described by j. V3 is the input to the vco and also the pll output which is the demodulated signal trig. And i am trying to run a pss and pnoise analysis of this pll to estimate the vcos pnoise contributition, but always failed in pss analysis. A more circuit oriented approach to build a vco is to take a simple tank oscillator and use a voltagedependent reactance for one of the tank components. The program lies within education tools, more precisely science tools. Included in the download of ltspice are macromodels for a majority of analog devices switching regulators, amplifiers, as well as a library of devices for general.
The data sheets do not show enough information about the vco part of the chip to accurately model it, so if you dont have the spice model you may have information about the vco part of the chip and that would do nicely too. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages and waveforms. Thus, in practice, simulation is widely used for the study of pllbased circuits see, e. The ltspicemodel of the piezoelectric transducer is a slightly modified adaptation of the spice model, described by j. Its operation seems nearly miraculous, but feedback makes the job easy and it is an excellent example of feedback in action. Spice simulation program with integrated circuit emphasis. Ltspice demo circuits design center analog devices. Possibilities and limits of circuit simulation for radio. Simulating the 555 ic with ltspice embedded components. Cadence pspice technology offers more than 33,000 models covering various types of devices that are included in the pspice software. Pdf modeling of piezoelectric and acoustic elements with. The zx device is used to implement a voltagecontrolled lossy inductor.
Pllatinumsimsw texas instruments pllatinum simulator tool. Ltspice is a powerful, fast and free simulation software, schematic capture. Spice simulation program for integrated circuits emphasis is widely used circuit design and. What we have learned so far enables us to simulate most designs. A brief tutorial on ltspice university of washington. Tina has extensive postprocessing capability that allows you to format results the way you want them. The file size of the latest installer available is 37.
A varactor diode may be used into the tank circuit to provide a voltage variable input for the oscillator. Fig 1 shows the jig of the ltc3878 external fet buck converter with a resistive load of 80mohms. Ltspice is a high performance spice simulation software, schematic capture and. For more information on plls in general i suggest checking out my video simulating an analog phase locked loop. Hello there, does anyone have a spice model for this or similar chip. Also alternative ideas can be examined quickly or a prototype can be optimised. Tinati provides all the conventional dc, transient and frequency domain analysis of spice and much more. Simulation programs like puff or ansoft designer sv. This device is designed for pll and for applications where a variable frequency clock of high spectral. The use of circuit simulation always means precious work time is saved. Filter design up for passive and active filters up to 4thorder. The data sheets do not show enough information about the vco part of the chip to accurately model it, so if you dont have the spice model you may have information about the vco part of the chip and that would do nicely. This article presents an ltspice circuit that can be used to explore the behavior of a phaselocked loop. Part selection based on current, cost, phase noise and package.
Save it to the folder where you will be putting your schematics. The current yahoo ltspice user groups model does not model the vco section fully, so i homebrewed one which better reflects the functionality as set out in the texas instrument application report scha002a and the datasheet. Included in the download of ltspice are macromodels for a majority of analog devices switching regulators, amplifiers, as well as a library of devices for general circuit simulati. I have many of the 74hc4046 and want to make fm circuit from it. Ive uploaded the model and ancillary files to the user group, but. A brief tutorial on ltspice engineers use software tools for the design and analysis of circuits. Ltspice iv is a high performance spice simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators. The enhancements to spice have made simulating switching regulators extremely fast compared to normal spice simulators, allowing the user to view waveforms for most switching regulators in just a few minutes. If a spice simulation of a rf circuit delivers the same results as an s parameter simulation at the same operating point then there are unbelievable possibilities. The awkward pin is the 6th pin which, in theory, should output. In a previous article i introduced the fundamental concepts and the core functionality of a negativefeedback system known as a phaselocked loop pll. Ltspice is a high performance spice simulation software, schematic capture and waveform viewer with enhancements and models for easing the simulation of analog circuits. Two different models are available for the voltage controlled oscillators vcos and the phase detector. Spice simulation of a voltage controlled oscillator that requires an external lc tank circuit to fix the oscillation frequency.
Discussion in general electronics discussion started by roltex. I also attached the complete files for the simulation seen on page 105 of the notes same file name as the figure name, namely figure6012. Delay phase locked loop dll design which can be used for a variety of applications. The software tools help to simulate the behavior of electronic circuits in different operating conditions, and support the design of circuits before actually building them using hardware. Join date feb 2004 location ne usa posts 372 helped 74 74 points 5,173 level 17. These are in principle all spice and pspice programs. Download pspice for free and get all the cadence pspice models. The national instruments spice simulation fundamentals series is your free resource on the internet for learning about circuit simulation.
Here i show how to simulate phase locked loops plls with matlab. Feel free to download my ltspice schematic by clicking on the orange. How might one implement pll phase lock loop in ltspice. But all i could get out of the simulation was a black screen with voltage and timing ticks along the left and bottom edges. The series is a set of tutorials and information on spice simulation, orcad pspice compatibility, spice modeling, and other concepts in circuit simulation. Well continue our spicebased pll experimentation in the next article. Ltspice is a high performance spice simulation program app, schematic capture and waveform viewer with enhancements and models for easing the simulation of analog circuits. Pll simulation using hspice this project demonstrates the simulation of a phaselocked loop pll based on the example provided in the synopsisr hspicer applications manual. The pllatinumsimsw simulator tool lets you create detailed designs and simulations of our pllatinum integrated circuits which include the lmx series of plls and synthesizers.
Adisimpll request for software form analog devices. This program is a partial rewrite of ltspice iv with a modern graphics library for native multimonitor support. Choosing appropriate spice models 9 equivalent circuit for package lead 1 regarding latest. Included in the download of ltspice are macromodels for a majority of analog devices switching regulators, amplifiers, as well as a library of devices for general circuit. Jun 08, 2017 the video helps you in adding a custom digital logic components in ltspice to simulate basic digital combinational and sequential circuits. The circuitry depicted in figure 1 represents a mixed signal model of the 74hct4046 phase locked loop that is. A transient simulation requires requires a few changes from the bias point dc analysis carried in the introductory tutorial. Cd4046 pll spice model or vco info needed electronics. This free program is an intellectual property of linear technology corporation.
The basic simulations were carried out with ltspice. Analog devices design tools simplify your design and product selection process through ease of use and by simulating results that are optimized and tested for accuracy. Ltspice is freely available software and can be downloaded from the website of linear technology. Ltm4601 demo circuit 12a dcdc modules with pll, output tracking. In spice you can easily fiddle around with the values of the individual components, and immediately view the results directly in the frequency response. The use of this design is governed by, and subject to, the terms and conditions of the hardware reference design license agreement. Pdf design and simulation of digital phase locked loop using. Spicesimulation using ltspice iv reverse engineering. Find file copy path fetching contributors cannot retrieve contributors at this time. I was able to configure and run the simulation using the drop down tools menu and the little running person icon on the tool bar. Pll is essentially a nonlinear control system and its rigorous analytical analysis is a challenging task.668 1299 554 1584 1194 531 546 488 1303 2 1274 901 1503 710 213 136 137 1584 1610 157 769 718 430 1556 1386 1331 1448 742 373 775 734 644 32 1040 1488 121 822 446 580 1445 1302 1417