Hfss then generates the necessary field solutions and associated port characteristics and sparameters. Rectangular waveguide hfss r objective getting started with hfss a tutorial using hfss, simulate an airfilled wr90 waveguide shown above. Explore the techniques of deembedding and embedding sparameter networks with a dut. S parameter measurements basics for high speed digital engineers frequency dependent effects are becoming more prominent with the increasing data rates of digital systems. Breakthrough developments in tdrtdt measurement technology kevin kershner digital systems specialist may, 2014 1.
August 16, 2018 11 frequency sweeps for driven solutions. Hfss creating results plots courserepsecen452spring2016. The error coefficients can be modified using the errorcorrecting. The error coefficients can be modified using the errorcorrecting algorithms of. Ansys high frequency structure simulator hfss tutorial august 16, 2018 1 mark jones pacific northwest national laboratory. Application of em simulators for extraction of line parameters 2. Chapter 2 application of em simulators for extraction.
Integration of ansys hfss and ansys designxplorer offers new valuable insights into behavior of em designs entire solution space of hfss design can be investigated using builtin or custom doe algorithms provides powerful 3d and 2d visualization of solution space to evaluate performance trends. When these sparameters are aligned in a matrix form a11, it is referred to as an smatrix scattering matrix. For example, if we multiply the following tparameter matrix by. How to accurately measure and validate s parameters for transistor modeling. Mixed mode sparameters eye, jitter, ber, statistics, cross talk comparison with measurement deembedding techniques is ads design improvements matching networks optimization of analog circuit system simulation including analog cannel and dsp circuits optimization of analog and dsp circuit.
The length of the line must be long enough such that only one propagation mode exists on the reference plane of the port. In case of sparameterbased deembedding extraction, the load is assumed to be ideal no model information read from the specified. Hfss calculates the resonances for the model based on the geometry, materials, and boundaries. Agilent deembedding and embedding sparameter networks. Training and tutorial material are available for both a broad range of ansys products and users experience. The problem with this technique is that it is always difficult to properly design an ideal short device, in particular in more advanced multilayer metal processes that require. Hfss assigning wave ports courserepsecen452spring2016. S parameters are usually displayed in a matrix format, with the number of rows and columns equal to the number of ports. A tutorial 5 two paradigms will converge in the near future, leading to a robust, versatile design methodology. Chapter 2 application of em simulators for extraction of. For a more detailed defi nition, please refer to the textbooks 1 to 5.
Supports multiple modes and deembedding computes generalized sparameters frequency dependent characteristic impedance zo frequency dependent propagation constant perfectly matched at every frequency and every scan angle all significant mode need to be defined in the floquet port setup to obtain accurate solutions. You can even use a linked hfss simulation as the source. The device must be connected by a section of transmission line or waveguide supporting traveling waves. Caspers cern, geneva, switzerland abstract the concept of describing rf circuits in terms of waves is discussed and the smatrix and related matrices are defined. Deembedding s parameters in cst 3 part and inventory search. Pdf in this paper, a deembedding method is proposed to measure the. Sparameter measurements basics for high speed digital engineers frequency dependent effects are becoming more prominent with the increasing data rates of digital systems.
Often observation of the physical structure of the test. It assumes the two end blocks are nearly identical not so true at high frequency. Keysight eesof eda how to design an rf power amplifier video library play all a collection of how to design power amplifier videos from keysight eesof eda 0. Cost function can be based on any solution quantity that hfss or designer can calculate field values, sparameters, and eigenmode data optimetrics changes design parameter values to meet goal.
Sparameters can be measured directly using a vector network analyzersvna or using a lecroy waveexpert sampling oscilloscope with time domain reflectometry tdr and time domain transmission tdt options. Avx corporation is a leading international supplier of electronic passive components and connectors with worldwide manufacturing facilities. Pdf deembedding method to accurately measure highfrequency. Equivalent circuit of an embedding example where two 4port. The graphic below defines the models solved in hfss. When you deembed, you adjust the reference plane of the. While defining the number of modes during waveport excitation of patch antenna, it was suggested that an integration line is to be drawn from the lowest potential to the highest potential conductor.
S parameters are easier to measure at high frequency. This example shows you how to extract the s parameters of a device under test dut using the deembedsparams function this example will use the s parameter data in the file samplebjt2. Differential sparameter deembedding for 8port network. In this paper, a new deembedding technique with lookup table lut is presented for measurements and characterization of highspeed interconnects. A thrushortopen deembedding method for accurate onwafer. Single tem mode with no deembedding can be internal to model. The base hfss offering includes 3d and layout interfaces, 2. For the s parameter s ij the j subscript stands for the port that is excited the input port, and the i subscript is for the output port.
Sparameters are important in microwave design because they are easier to measure. Often, this feature is used to calculate a step response or timedomain reflectometry tdr plot of the. The trick of course is that the fixture must be characterized before it can be removed from the data. Hfss tutorial courserepsecen452spring2016 wiki github. Structures of pads and guided microstrip line gmsl. Agilent deembedding and embedding sparameter networks using a vector network analyzer. Sparameters a 1 b 1 b 2 a 2 a b 1 b 2 s 11 s 12 s 21 22 a 1 a 1 introduction trl reciprocity scilab code somede. Sparameters model quality assurance and macro modeling with hfss or cst simbeor compliments with analysis of tlines with advanced dielectric and conductor roughness models analysis of planar discontinuities sparameters model quality assurance and macro modeling. Deembedding and renormalizing if you plan on both deembedding and renormalizing a structure, you must deembed the solution first. Apr 19, 2016 hfss assigning boundaries to 2 d objects. Deembedding considerations for high q rfic inductors. A frequent need in sparameter measurements is to remove the effects of a fixture or virtually.
Window functions and timedomain plotting in hfss and siwave. Pdf on jul 1, 2018, bichen chen and others published differential sparameter deembedding for 8port network find, read and. Measurement accuracy at mmmeasurement accuracy at mm. It consists of patch elements on one side of a dielectric substate and a planar ground on the other side. Pdf accuracy investigation of deembedding techniques based. To obtain the field patterns, intrinsic impedance and wavelength for the first 4 modes.
Thus s 11 refers to the ratio of the amplitude of the signal that reflects from port. Deembedding and embedding sparameter networks using a vector network analyzer. While field calculator operations may be performed at any frequency to which the fields post. Design challenges millimeterwave cmos radios present formidable challenges at all levels of abstraction, demanding that designers ascend and descend the devicecircuitarchitecture. The objective is to provide a very thorough introduction to hfss as applied to antenna design, which may be followed stepbystep in hfss. Note if you are using the eigenmode solution solver, you do not need to specify sources for the problem.
Simulating the waveguide sparameters as can be seen from the plot of hfss waveguide tutorial. Hfss window functions and timedomain plotting in ansys hfss and ansys siwave hfss and siwave allow for timedomain plotting of s parameters. Among the various onwafer deembedding techniques, the openshort method 1 is very well known. Differential circuit topology is commonlyused as an implementation method, with the goal of enhancing the data carrying capable of the physical layer. Avx offers integrated passive devices including capacitors, resistors, filters, smt, timing devices and circuit protection devices. Sparameter techniques hp application note 951 ieee long.
Modelithics avx mvp model listing modelithics, inc. The most complete, although certainly not the easiest, route is to fully extract fixture sparameters either iterative simulation or multiple calibrations. Even though the electrical equivalent circuit eec of the pad proposed in ref. The paper provides an overview of the math, inherent assumptions, and strengths of each method, while the presentation focuses more on practical application. A preestablished lut is introduced to cover various. Often observation of the physical structure of the test fixture is required for. Deembedding and embedding sparameter networks using a. Hfss running the simulation and checking the progress. To open hfss using the windows search bar, type in ansys electronics desktop. The former is easier to understand in that a model for the fixture is generated either from first principles or. This virtual network must be known and usually in the form of a circuit model or sparameter data from previous measurements for example. When you solve the circuit and push the excitations back into hfss, the fields in hfss will be postprocessed to take into account the lumped element tuning from the circuit schematic but there is no way to see these tuned sparameters in hfss. Resonant frequency of the antenna10ghz relative permittivity of the substrate 2.
Getting started with hfss v9 for antenna design october, 2003 this getting started training material is intended for new users of hfss. System ads and agilent high frequency structure simulator hfss. Agilent deembedding and embedding sparameter networks using. Probe feed patch antenna2 probe feed patch antenna getting started click the microsoft start button, select all programsansoft hfss 12 hfss 12 or double click on the hfss 12 icon on the windows desktop adding a project and design to insert a design into an open project. Ansys high frequency structure simulator hfss tutorial.
Pdf differential sparameter deembedding for 8port network. Open hfss and save a new project a project is a collection of one or more designs that is saved in a single. This video demonstrates the use of several modeling tricks in ansys hfss to create a microstrip design and excite it with a lumped port. High frequency structure simulator for 3d electromagenetics hfss is a platform that includes multiple simulation technologies for component or system design. Hfss and siwave allow for timedomain plotting of sparameters. How to use fixture deembedding to match signal integrity. Deembedding and embedding sparameter networks using a vna. Window functions and timedomain plotting in hfss and. Dielectric and conductor roughness model identification for. Search the hundreds of courses available and improve your.
Ansoft hfss compute menu matrix data go back contents index compute commands the following commands are available from the compute menu. Deembedding method using em simulator for characterization of. Using ads to ensure signal integrity on multigigabit serial. Software like computer aided design cad tools can be used to calculate sparameters examples are hfss field solve tools or the ads. Since we will be using a trl calibration when measuring our devices, it is important to use port deembedding in our hfss simulations so that the reference plane is the same for simulated and measured data. Deembed is possible due to the computed complex propagation. Accuracy investigation of deembedding techniques based. Abstract as the cutoff frequency of inp hemts enters the terahertz band, high frequency measurement and modeling techniques in hundreds of gigahertz become urgent needs for further millimeter monol. This example shows you how to extract the sparameters of a device under test dut using the deembedsparams function this example will use the sparameter data in the file samplebjt2. Cae approach is faster, produces accurate results, and is easier to follow than manual methods using graphical design aids. Often, this feature is used to calculate a step response or timedomain reflectometry tdr plot of the structure being simulated. Signal integrity journal finally, an augmented reality app. Structure of patch antenna design in hfss athe 2x2 patch array antenna design is shown in below figure in 3d model. Klausst 33, betwixt 30, fvm 29, easy peasy 21, sutapanaki 15.
George2278, i started using floquet ports new to hfss v11 which give you the advantage of offnormal plane wave illumination, but found that i get subtly different results depending on the floquet port and structure seperation. The measurement is direct and only involves measurement of relative quantities such as the swr or the location of the. A simple deembeding method for onwafer rf cmos fet using. The only way to get sparameters to match in both hfss and designer is to have a circuit port. The signal flow graph sfg is introduced as a graphical means to visualize how waves propagate in an rf network. Ansoft hfss field calculator cookbook a brief primer and collection of stepbystep calculator recipes for use in hfss fields postprocessing. A new project is automatically created when hfss is launched. Accuracy investigation of deembedding techniques based on electromagnetic simulation for onwafer rf measurements article pdf available september 2012 with 767 reads how we measure reads. Processor need not even be a precise data point at which the sparameters were calculated. Open hfss and save the default project by a new name.
Window functions and timedomain plotting in ansys hfss and. Ansoft hfss can be used to calculate parameters such as sparameters, resonant frequency, and fields4. Analysis must include first three modes te10, te20, te01 3. Single tem mode with no deembedding can be internal to. Accuracy investigation of deembedding techniques based on.
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