Pspice simulation and experimental results demonstrating chaotic performance of the colpitts oscillator in the very high frequency 30 to 300 mhz and the ultrahigh frequency 300 to 000 mhz. Spice simulation with tina design suite of a 1 khz rc phase shift oscillator. One way to do that is to add a short single pulse of current to the oscillator loop using a current source. Colpitts oscillator was invented by american scientist edwin colpitts in 1918. The current source will take forever charge a f capacitor t c3vi 51e6 5e9 seconds or about 158years. This video takes a look at the colpitts oscillator circuit using pspice.
As with the hartley oscillator, the colpitts oscillator uses a single stage bipolar transistor amplifier as the gain element which produces a sinusoidal output. To conclude we can say that pspice is a great program for designing, analyzing and simulating all kinds of electronic circuits. A new window pop up with the pspice project type, select create a blank project and click ok. Pspice simulation of the bjt colpitts oscillator using the deck shown in fig. The first choice available is new simulation profile. Wien bridge oscillator the wien bridge oscillator is one of the simplest oscillators. Pspice keeps track of device parameters for bjts, for example in separate files called library files. Pspice student is an analog circuit simulator that was specially designed for electrical engineering students in need of simulating circuits and of solving circuitsrelated calculations. This is a colpitts oscillator, an oscillator that uses an lc circuit combined with a transistor for feedback with the transistor removed, the inductor and two capacitors form a resonant circuit, like the lrc example.
Pspice simulation o f colpitt s oscillator friends anytime. The tuned collector oscillator is one kind of transistor lc oscillator where the tank circuit comprises of a capacitor and a transformer, that is connected to the collector terminal of the transistor. The operation of an opamp colpitts oscillator is exactly the same as for the transistorised version with the frequency of operation calculated in the same manner. The email address is not made public and will only be used if you wish to receive a new password or wish to receive certain news or notifications by email. It is another type of sinusoidal lc oscillator and is basically a harmonic oscillator, which has a. All emails from the system will be sent to this address. Owing to its relative simplicity, ease of oscillation, wide range of frequency operation, absence of mutual inductance and thus frequency stability, it has been widely used for the generation of fairly low distortion sine wave signals. Wien bridge oscillator, phase shift oscillator, twint oscillator network is used for audio frequency range and lc e. Just like the hartley oscillator, the tuned tank circuit consists of an lc resonance subcircuit connected between the collector and the base of a single stage transistor amplifier producing a sinusoidal output waveform. Pspice simulation and experimental results demonstrating chaotic performance of the colpitts oscillator in the ultrahigh frequency 300 mhz range are.
You could have done the same thing by leftclicking on the button on the toolbar. A novel version of the chaotic colpitts oscillator is proposed. This can be achieved by making the variable capacitor from varactor diodes. Apr 12, 2012 sometimes to get a oscillator started in simulation you need to add a little perturbation to simulate the noise in a real circuit. After selecting skip the initial transient bias point calculation skipbp in pspice simulations options everything got better. The highperformance design entry, simulation, and layout editing tools provide an integrated environment for design engineers to validate the safety specifications against individual. In this research, a colpitts oscillator is comprised from a bipolar junction transistor bjt amplifier with lc tank. It is an ascii text le created using any text editor. A colpitts oscillator is a discrete lc oscillator that uses a pair of tapped capacitors and an inductor to produce regenerative feedback. For more pspice circuit videos check out my channel and feel free to subscribe. In the rc oscillator tutorial we saw that a number of resistors and capacitors can be connected together with an inverting amplifier to produce an oscillating circuit one of the simplest sine wave oscillators which uses a rc network in place of the conventional lc tuned tank circuit to produce a sinusoidal output waveform, is called a wien bridge oscillator. A tutorial study of the colpitts oscillator family defined as all oscillators based on a nonlinear amplifier and.
Place the part by clicking in the schematic, and then press escape to stop placing dc sources. Circuit diagram of the chaotic colpitts oscillator. Pdf a low voltage tuned colpitts oscillator using cdta. Pspice technology delivers inherent mixedsignal simulation capabilities along with the ability to integrate with orcad and allegro tools, making power supply analysis simple. This video takes a look at the colpitts oscillator circuit using. Colpitts oscillator simulation problem with pspice. In the new simulation dialog box, type oscillator in the name field. You are trying for a frequency of about 700khz, so go to a larger current and a much smaller capacitor 0. The video shows a tutorial on how to build a phase shifted oscillator. When i did the pspice, i am getting amplitude of the output in the range of pv.
Current moves back and forth as the capacitors charge and discharge through the inductor. The circuit diagram of the simulated colpitts oscillator in common emitter configuration is shown in fig. Just like the previous hartley oscillator, as well as using a bipolar junction transistor bjt as the oscillators active stage, we can also an operational amplifier, opamp. Study the following oscillators and observe the effect of variation of c on oscillator frequency. Simulation is an essential link in the process of pcb design. Pspice simulation of colpitts oscillator friends anytime. Sometimes you can get them to start by applying an initial condition to a capacitor or inductor which is different from the steady state condition. The colpitts oscillator coined in 1918 by colpitts has been an attractive l c inductivecapacitive tank based oscillator. A simplied introduction to circuit simulation using spice opus 7 figure 2. Twostage chaotic colpitts oscillator electronics letters dtu orbit. A similar oscillator in the examples miscellaneus circuits claposcillator works great, adn the book where i found it also simulated it in multisim and according to it, simulation works fine as well book is electronic devices eighth edition, by floyd, page 84x. Colpitts oscillator circuit diagram working and applications.
Basically,what i know of a ring oscillatorit is a circuit with only one stable operating point that is vinvoutthreshold of the inverter. Sometimes to get a oscillator started in simulation you need to add a little perturbation to simulate the noise in a real circuit. Combination of inductor and capacitors determine frequency of oscillator. To create a simulation profile, click pspice new simulation profile. By using canonical number of components, the circuits. Sometimes an oscillator simulation will not start because the initial dc operating point part of the simulation finds a quasistable state with no oscillation which would not likely occur in a real circuit due to intrinsic circuit noise. Users may download and print one copy of any publication from the public portal for the purpose of private study or. Oscillators which utilizes the inductor l and capacitor c in their circuit are called as lc. It will be noticed that the control line from the phase detector is isolated from the varactor diodes. Pspice student kostenlos windowsversion herunterladen. It allows you to simulate with ideal models for faster simulation during proof of concept, or simulate with actual electrical designs without the need to prototype the entire. It is type of feedback lc oscillator where feedback is supplied capacitively. These files are required in order for the simulation to run.
May 05, 2016 the theoretical results were verified by pspice simulation. We perform pspice schematics circuit simulation according to following steps. In the analysis we will find the id current and the vds voltage at the given values of vdd and vgs. The simulinkpspice interface enables simulation between pspice designer and simulink, allowing designers to simulate complete systems in a virtual prototype environment. By the aid of nullormirror models of the secondgeneration currentcontrolled conveyor cccii and applying the nodal admittance matrix nam expansion method, the family of currentmode colpitts oscillators employing four ccciis and three grounded capacitors is synthesized. Thirtytwo colpitts oscillators using ccciis are obtained in all. These simulation capabilitiessensitivity, monte carlo, smoke stress. I have been given the following circuit of colpitt oscillator with the design values. In many ways, the colpitts oscillator is the exact opposite of the hartley oscillator we looked at in the previous tutorial. Download solid state logic case study download appnote single switch forward converter internet of things. First, the circuit is implemented on pspice to test. Leftclick on it and the following window will appear. A crystal has an extremely high qfactor quality factor of 5000 or more, which leads to very long simulation time for any oscillation to build up. Try using the use initial operating conditions option.
The circuit diagram below is what you will build in pspice. Systematic synthesis for electroniccontrol colpitts oscillator using. Hartley, colpitt, clapp oscillator for rf applications. Pdf design and simulation of high frequency colpitts oscillator. The project is about the making of colpitt oscillator that will generate approximately 1 mhz frequency. Oscillator is an amplifier with the positive feedback and it converts dc input signal into ac output waveform with certain variable frequency drive and certain shape of output waveform like sine wave or square wave, etc by using the positive feedback instead of input signal. This is a colpitts oscillator, an oscillator that uses an lc circuit combined with a transistor for feedback. Apr 21, 2018 pspice simulation of colpitt s oscillator friends anytime. Pspice tutorial create a new project and select analog or mixed ad. If you find yourself in the posture of not understanding a bit of what your professor is teaching you in circuit theory class. Therefore,whenever theres a devviation from this the circuit starts oscillating and this goes on indefinitely because of the feedback.
It is another type of sinusoidal lc oscillator and is basically a harmonic oscillator, which has a lot of applications. The cadence analog simulation with pspice course starts with the basics of entering a design for simulation and builds a solid foundation in the overall use of the software. The acronym pspice stands for personal simulation program with an integrated circuit emphasis. In this experiment we will study the wien bridge oscillator. After selecting skip the initial transient bias point calculation skipbp in pspice simulation s options everything got better. Ptat simulation example using pspice 9 auburn university. Basic screen there are three windows that are opened. The choice of collector current is arbitrary but the amplitude will grow in proportion to ic. With the transistor removed, the inductor and two capacitors form a resonant circuit, like the lrc example. Systematic synthesis for electroniccontrol colpitts. Most library file errors occur when a user copies a simulation from one folder or machine to another, and fails to keep the accompanying library files intact with the. If this qfactor value is high, it contributes to a greater frequency stability of the crystal at its operating frequency making it ideal to construct crystal oscillator circuits. Thanks to the advanced simulation technology, students will save time and obtain reliable designs of large sizes.
A simplied introduction to circuit simulation using spice opus. Dc bias simulation to start the simulation process, open the pspice menu. The theoretical results were verified by pspice simulation. Colpitt oscillator with bjt and barkhausen criterion 3 credits add to cart. Colpitts oscillator is an electronic oscillator which uses an inductor and capacitors to form an lc oscillator circuit. Colpits oscillator pspice design all about circuits. Dont use a voltage source since that will short the loop to ground. Here you can download some schematics to test with qucs. Since this is a new simulation profile, leave the inherit field at default value none. The tune voltage for the vco can then be applied to the varactors. May 14, 2019 by the aid of nullormirror models of the secondgeneration currentcontrolled conveyor cccii and applying the nodal admittance matrix nam expansion method, the family of currentmode colpitts oscillators employing four ccciis and three grounded capacitors is synthesized. To make a vco, the oscillator needs to be tuned by a voltage.
Colpitt oscillator with bjt and barkhausen criterion. In which the following components capacitor, inductor, resistors and transistor were used. In the part list, select the part vdc and then click the place part button or hit enter. The basics of spice and how its integrated into autodesk eagle. Pspice is a simulator provided by orcad pcb design software. Biasing and bypassing in order to simulate the open loop gain and the oscillator closed loop response, we first need to bias the transistor. Apr 22, 2016 for more pspice circuit videos check out my channel and feel free to subscribe.
The paperandpencil analysis and pspice simulation results have been included to support the synthesis method. Double click on the text 0vdc to change the voltage, set it to 10vdc construct this circuit by selecting the analog library and placing two resistors, which appear in the part. Upgrading to orcad pspice designer plus provides the pspice advanced analysis simulation engines that are used in conjunction with core pspice simulation to maximize design performance, yield, costeffectiveness, and reliability. Whether youre a student or professional, spice will allow you to predict the behavior of your electronic circuits accurately. Colpitt oscillator is a device that consists of inductor and. Colpitts oscillator tutorial and colpitts design electronicstutorials. Prepare a circuit for simulation to simulation your design, you need to provide pspice with the following information. Identical and mismatched cases chaos in the colpitts oscillator has been demonstrated by tmeans of pspice simulations and hardware experiments 1. The parameters of the lumped circuit elements are listed in table 6. Coupled with work flow of orcad capture, pspice provides a fast trailer prior to board design in order to increase pcb manufacturing efficiency and ensure the final performance of pcbs. Jun 11, 2010 pspice is an useful simulation program and analog circuit software which can be run from home or personal computers. Other issues include the time it takes for the oscillation to start and the timestep size in the simulation.
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