As the industrys leading solution for accurate analog simulation, the cadence spectre simulation platform contains multiple solvers to allow a designer to move easily and seamlessly between circuit, block, and systemlevel simulation tasks. Who has simulated the phase noise of pll by spectrerf. This allows you to measure properties of the wave, such as amplitude or frequency. This simulation animates harmonic oscillator wavefunctions that are built from arbitrary superpositions of the lowest eight definiteenergy wavefunctions. An oscilloscope is a useful tool for anyone working with electrical signals because it provides a visual representation of the signals shape, or waveform. Virtuoso spectre circuit simulator rf analysis user guide product version 6. Pnoise to define and evaluate different types of jitter in driven and autonomous circuits, such as oscillators. Analysis fundamentals, oscillator fundamentals, limiting and starting, biasing, noise, computer simulation and examples and case studies.
This document explains phase noise, tells how it occurs. You can also check a circuit for errors before simulating it. Circuit envelope simulation enables spectral regrowth, iq parameters, acpr, npr, evm, ber simulations of amplifiersmixers and characterization of the transmission line quality. Quantum harmonic oscillator weber state university. Customers use cadence software, hardware, ip, and expertise to design. Signal partitioning provides a method of decomposing a circuit so that multirate behavior can be exploited to increase simulation performance. A new model to analyze the effects of noise in a real. Notice the longlived transients when damping is small, and observe the phase change for resonators above and below resonance. Oscillator noise analysis in spectrerf overview back closepage 2 close overview in rf systems, local oscillator phase noise can limit the. Phase noise spectrum of the current starved ninestage ring oscillator. Spice and its family simulators are widely used for crystal oscillator design1.
Spectrerf psseldorf sst analysis is run until the voltage has settled on the input node. How to simulate a voltage controlled oscillator using spectrerf. The pll is a feedback loop that, when in lock, forces ffb to be equal to fin. After the simulation, the performance of the oscillator can be obtained fig. The following two parameters have been added to the transient analysis. Simulating crystal oscillators can be painful in transient analysis it can take a long time to reach steady state. The clock faces show phasor diagrams for the complex amplitudes of these eight basis functions, going from the ground state at the left to the seventh excited state at the right, with. Pdf non linear modeling of quartz crystal oscillators. Numerical simulations are performed in a homemade prototype timedomain simulator referred to as simulation laboratory slab 15 and verified with spectrerf 16. Given a reference frequency fref, the frequency at the output of the pll is. I am trying to simulate my transmitter tx design in spectrerf cadence. Virtuoso spectre circuit simulator rf analysis user guide.
I choose for the simulation parameters the hardi case suggested in the oscillator noise analysis in spectrerf. Below are the pnoise and hbnoise choosing analyses forms for an oscillator circuit. A versatile timedomain approach to simulate oscillators. And in different applications, how to make a choice of the proper method. Published in the ieee journal of solidstate circuits, vol.
The last development of a simulation program specialized in the quartz crystal oscillator analysis is presented in this paper. I want to simulate the complete tx using a real cellular signal, such as cdma or lte. Search terms rf simulation, shooting methods, harmonic balance, circuit simulation, spectrerf, modulation, oscillator phase noise, cyclostationary noise. Spectrerf lets you rigorously characterize the noise performance of oscillator elements. Spin torque oscillator modeling, cmos design and stocmos integration. Rfic dynamic link setup how to set up rfic dynamic link idf that provides an integration interface between ads and the cadence analog environment. Do a transient simulation of the start up of the oscillator with the crystal attached. The cadence spectre rf option provides numerous rf analyses built on siliconproven simulation engines in both the time and frequency domain simulation. There are several methods to simulate ip3 in spectrerf. Spectre circuit simulator user guide columbia university. Noise simulation in spectre rf using improved pnoisehbnoise. When the applet starts up you will see an animated schematic of a simple lrc circuit.
The proposed model has been implemented in an ode simulation software, and the obtained power spectral density has been compared to the one obtained with the spectrerf circuit simulator. The foundation of the platform is a unified set of technologies shared by all of the enginesthe parser, device models, veriloga behavioral. The software offers support for both 32bit and 64bit configuration. Affirma rf simulator spectrerf user guide april 2001 5 product version 4. Besides, the dc simulator will be used again to have a whole evaluation of the circuit. Today we explore the use of oscillator synthesis software genesys for practical crystal oscillator design, and the impact of the randallhock correction formula on linear open loop analysis accuracy.
Creating a parameterized cell in cadence basic tutorial for creating custom parameterized cells in cadence. This simulation is very fast, because there are no high q elements in the circuit. The mixer tutorial and assignment at the end of tutorial is optional lab2 tutorial gilbert mixer simulation cadence spectrerf prepared by rashad. In the library manager window, open the schematic view of the design oschartley in the library rfworkshop. Macspice is a circuit simulation software for the mac devices using the intel processors. A device that is used to represent the behavior of a physical system through its analogous characteristics top ranked articles. It allows you to design variety of electromechanical systems using relays, time relays, buttons, motors, switches and some basic mechanical systems. Tinati is a free circuit simulation software that can be used to design and simulate circuits. The wide range of analyses provides design insight and enables verification of broad rfic types, including mixers, transceivers, power amplifiers, dividers, switched capacitors, filters, and phaselocked loops plls. I have created a schematic with ideal components from analoglib and veriloga models for the digital gates. Observe resonance in a collection of driven, damped harmonic oscillators. Below is the pnoise strategy that we suggest you use when simulating oscillators with spectrerf. Sanjarka education presents laboratory experiments sixth part.
The simulator actually being developed is using the full nonlinear. You learn simulation setup methods of various analyses pertaining to commonly used rf circuits to simulate periodic operating points, transients, and rf. The proposed model has been implemented in an ode simulation software, and the ob. Although spice is a powerful simulation tool, speci. This simulator can simulate the fundamental frequency, output power and phase noise performance of the oscillator. Non linear modeling of quartz crystal oscillators, development of a simulation software. For both pnoise and hbnoise, the sources and modulated. However, when i run a pss analysis with either traponly or gear2only integration method, i encounter startup problems or wrong estimation of the frequency for instance 6mhz instead of 0. The spectre rf option uses the harmonic balance method to perform frequencydomain, periodic. Simulating crystal oscillators is much easier in mmsim12.
While there are certainly more comprehensive soft synths on the market, this is a synth which is far from basic and there is plenty to keep the more experienced user happy. Relaxation oscillator using opamp implemented with. Virtuoso spectre circuit simulator rf analysis user guide 9. Proteus simulation software does not require this initial push and thus it may be easier to use proteus software. Vary the driving frequency and amplitude, the damping constant, and the mass and spring constant of each resonator. Amazingly user friendly and simple for even the novice hobbyist to dive into. Kvco simulation pss periodic steady state analysis any veriloga models are not allowed in the simulation bench, pss does not support veriloga. The following steps enabled me to successfully simulate this oscillator without an initial pulse input on proteus software. An electric software simulator like spice is integrated in adoq analyse dipolaire des oscillateurs a quartz to obtain the nonlinear. Dedicated computer aided design software for quartz. To start an oscillator circuit, apply initial conditions or kickstart the oscillator. Advanced simulation capabilities include frequencydomain small signal simulation, stepping circuit parameters through a range, arbitrary laplace transfer function blocks, and more. The initial signal above is a 200hz sine wave, which has an amplitude of 5 volts. Make sure the vco works by setting the initial condition.
Obtaining convergence for highq xtal oscillators october 30, 2019 by kevin aylward when simulating very high q crystal oscillators using cadences virtuoso periodic steady state pss analysis, it is often very difficult to obtain convergence and thus obtain a simulation of phase noise. In response to customer requests, we have enhanced spectre transient analysis tran to calculate the initial conditions for rapid oscillator startup. Free electrical circuits simulator download electrical control techniques simulator ekts is a simulator for designing electromechanical systems. Use tighter convergence criteria or set maxstep tm. Oscillator design and computer simulation electromagnetic. This text covers modern cad synthesis and analysis techniques and is valuable to experienced engineers as well as to those new to oscillator design. Carry out dc analysis, ac analysis, transient analysis, fourier analysis, noise analysis, etc. For this purpose, i have created these signals in matlab and i am using co simulation between simulink and spectrerf. Spectrerf simulation option theory basic reference information december 2006 65 product version 6. The signal partitioning workshop describes how to speed up spectrerf harmonic balance simulation by using signal partitioning for special circuit designs. Pss failed to converge in spectrerf hello, i am trying to run a pss analysis with spectrerf for a ring oscillator and at the end of simulation, while transient simulation is completed succesfull, i get the following message from pss. Neocircuit setup setup for neocircuit, a sophisticated circuitoptimization tool. Spectrerf is currently the only commercial simulator that is suitable for characterizing the jitter of the blocks that make up a pll. You learn simulation setup methods of varied analyses pertaining to commonly used rf circuits to simulate.