GB/2373293-40.jpg' alt='Emi Filter Design Software' title='Emi Filter Design Software' />Input Filter Interaction. Input filter interaction with switching mode power. Problem. Oscillation. The addition of an input filter to a. Prior to oscillation, underdamped ringing may occur. In. current programmed converters, the system may go unstable with no degradation. ARNiLyL6FNKCsC4te5DwOE9TlHiHval6.jpg' alt='Emi Filter Design Software' title='Emi Filter Design Software' />The EMI2121 is an integrated common mode filter providing both ESD protection and EMI filtering for high speed serial digital interfaces such as USB2. The EM. Nuts Volts Magazine June 2017 Low Cost EMI PreCompliance Testing Using A Spectrum Analyzer. By Matt Maxwell View In Digital Edition. CST simulation experts present webinars on the applications, features and usage of our software. We present several series throughout the year on new features and. Mx Vector Decal Templates'>Mx Vector Decal Templates. STs portfolio of IPAD, IPD and smart antenna tuners integrates components and functions such as ESD protection, EMI and commonmode filtering, line terminations. Collection of classic and vintage audio hardware emulation, simulation or modeling by software as VST and RTAS plugins. EDesignSuite is an easytouse comprehensive software suite ready to help customers define their needs by transforming their application requirements into. EMIEMC, Capabilities and Facilities. EMI tests and EMC tests, as well as comprehensive design support of circuit cards, modules, equipment. Tm. 2012 emc directory design guide. The oscillations or underdamped ringing are due to the. Degradation. In addition to sustained oscillations or. RDK-Lambda_16-02-2017.jpg' alt='Emi Filter Design Software' title='Emi Filter Design Software' />Source. Certain source and line impedances can cause. For example, the inductance of a long input power cable. Load. Adding capacitance to the load can also cause the. Sustained Oscillation Characteristics. Amplitude. The sustained output voltage oscillations due to. Frequency. The frequency is near the resonant frequency of. Example. For example, a 5 Volt regulator operating from a. V battery with an LC input filter whose resonant frequency is 1 k. Hz, could. have a 5. Volt peak to peak one k. Hz sinusoidal oscillations on the 5 volt. V. peak. Cause. The cause of the oscillation is the negative input. Negative Resistance Input Characteristic. Transformer Model. A simple model of a switching mode power. Input voltage. Vin is uVout and the input current Iin is 1uout. However, the input. Rin is not the output resistance u2out but is u2out. The. negative sign comes from the constant power characteristics of a switching mode. Derivation. d. Vin d P P Vin Vout. Rin u2. Iin d. Iin Iin Iin2 Iin Iout. Rout. More sophisticated derivations in the references take into account. Relevance. System Effects. The stability and performance of a. Cause. Problems are usually caused by the addition of an. EMI filter, but can also be caused by long cables to the input power. Programming. Duty ratio voltage programmed power supplies. This is not necessarily true of current programmed power supplies. Worst Case. The worst case condition is at low line and. For current programmed converters operating conditions near the. Solvability. Analysis. For optimum design, the switching mode power. EMI filter should be designed together. Analysis. techniques have been developed that allow the stability solution of a. These are usually complex. Graphs. To simplify the design problems, graphical. If failed, there may or may not be a. The graphical solutions are dependent on the control. Criteria. For duty ratio programmed control voltage mode. Middlebrook criteria. For current programmed converters current mode. Basic Papers. The basic design papers for input filter. Middlebrooks paper for duty ratio. Jang. and Erickson modification for current programmed converters, which contains. A useful paper on the methods of damping input filters is the Phelps and Tate paper. Shunt Damped. One method of damping a single section LC. The analysis for this simple circuit is surprisingly complex and if. Middlebrook paper, which also reviews his. Timeline. The timeline of key. Solution. Analytical Techniques. Analytical techniques are beyond the scope of this presentation. However, some discussion is warranted as an introduction to the graphical. Modeling. The most common analytical approach to the. From this analysis, the loop gain. Ts, input to output transfer function Fs, and the output impedance Zos. By use of the. extra element theorem the effect of the input filter can then be determined in. Stability. For duty ratio voltage programmed control. Bode plots can be used to. Degradation of the closed loop output impedance also. For current programmed. Bode plots or the output impedance. The best monitoring point for observing the. Since. the cause of instability in current mode converters is often the appearance of. Nyquist criteria is usually used to analyze. This criteria must be applied to the full loop, not just the voltage. A good description of the loops that have to be considered is. Jang and Erickson paper. Once Again. It is important to re emphasize the fact that. Graphical Techniques The Middlebrook Criterion is a graphical method for. As usually applied. Error In the above diagram, Lo should extend into region P1 as a thick solid line and Ro between regions P1 and P2 should be a dotted line whose main purpose is the separate regions P1 and P2. This graph is a simplification for this discussion only and does not contain. If possible, it is recommended. Jang and. Erickson both voltage programmed and current programmed controllers or. Middlebrook papers voltage programmed controllers while reading. Instability. If the output impedance of the filter is. Degradation. If the output impedance of the input filter is. More Information. More information is found in the Timeline of key papers, especially the Middlebrook 7. Middlebrook 7. 8 papers, and the Jang and Erickson paper. Explanation of Middlebrook Criteria Plot. Assumptions. The circuit is the canonical model of a buck. The input filter is a damped LC filter. Input Impedance. The heavy blue line is the criterion used. Ro, Co, and Lo are the equivalent load resistance. The low frequency input impedance is Ro, which then. Co, which then breaks with the output. Lo. Near the LC break point, the impedance is modified by the damping of the output filter. Short Circuit. The light blue line is the reflected input. Rd is the reflected. Input Filter. The heavy red line is the output impedance of. Ls and Cs are the inductor and capacitor impedance. The LC. peaking is controlled by filter damping. Placement of Input Filter. No Problem in the Old Days. When 2. 0 k. Hz switching mode power. EMI. specification invoked was for conducted emissions above 1. Hz. This placed the. P1, beyond the negative input. Now a Problem. Later when MIL STD 4. CE0. 1 and CE0. 3. Hz, the. added filter often resonated at location P3, the absolute worst placement. At. first, filters where often place at location P2, but to get sufficient. Lo and adding. inductance from long input lines or added system filters caused Ls to migrate. Placement. Placing the input filter resonance at P4 insures. P5 is usually the most practical placement. Practical Placement of Input Filter. Placement. P5 is the most practical placement of the input. Input L. In this location, added input inductance from a. EMI filter or long leads to the power source will not cause the power. Ls will migrate to the left, which is safe, and. Q. Output C. However, added output capacitance may cause Co to. The input filter capacitance Cs should be greater. Co, including any added load. Degradation. Penetrating the Rd line will degrade regulator. This is often acceptable if the output impedance degradation. This maximum usually. Damping. A well damped input filter simplifies the design. Filter Damping. Input Filter. Feedforward techniques have been proposed to. See Kelkar and. Lee for an example. This technique is controversial and not recommended by. However, the primary reason for damping the input filter is. Example. For example, MIL STD 4. CS0. 1, applies an 8 Vp p. W maximum input on a 2. V input in the likely range of the input. Hz to 9 k. Hz. Other modulations invoked by specification or. Very little gain from the input filter Q is. This necessarily well damped. Output Filter. Explicit damping of the output filter is. However damping of the output filter may be desirably to. Rd degradation. line. Current Programmed Criteria. Y Parameters. Using y parameters, both the analytical and. Erich and Polivka, and by Kohut. Erich and Polivka use impedance for. Kohut uses admittance. Aaronia Spectran Forum and Spectrum Analyzer Developer Website  MCS Software. Removed an issue where span frequency could not be set below 1 MHz. Added calibration data for Iso. LOG Mobile, Hyper. LOG 6. 02. 00. X and Hyper. LOG 3. 02. 00. X. Added experimental commandline option for session restore. Various minor bugfixes and improvements. Use device specific frequency limits for UI elements. Fixed several issues with generating profiles from device settings. Linux version Change install location from optaaronia to optAaroniaMCS for interoperability reasons. On XFR devices the GPS sensor is no longer connected automatically as it may crash the application. Adjusted frequency parameters for V5 devices. Fixed import functionality for EFIS csv export. Added commandline option auto record to automatically start a recording. General update of sweep profiles. Various minor bugfixes. Fixed connection issues with current Spectran V5 devices. Fixed inverted values when processing UBBV2 calibration data read from devices. Added initial support for GPS Logger V2. Added calibration data for UBBV 0. Fixed application crash when generating reports on Windows. Changed logic for displaying frequencies to avoid bogus decimal digits. Added d. BAm as new unit. Fixed Peak Suppression for NF 5. S devices. Use correct unit to detect maximum value in Results control. Various minor bugfixes and improvements. Added a screenshot function to main toolbar. Added new trace type Dynamic Maximum that calculates the maximum of the last 2. The number of traces. Average trace and can be adjusted in the same way. Updated english manual. Updated FTDI driver on Windows. Ensure that replay progress bar ends at 1. Fixed GSM 1. 80. 0 UpDownlink profiles. Improved functionality of optical zoom mode in spectrum view. Improved error reporting when loading MDR files. Fixed graphical issues when drawing traces in spectrum view in certain situations. Added display of currently measured frequency cursor position and corresponding measurement value in result control. Loading a replay as reference trace will now apply suppression and calibration data. Fixed handling of Image suppression feature when using units other than d. Bm. Image suppression now also affects maximum, minimum and average trace. Added display of current peak suppression mode to statusbar. Fixed display of reference traces in time domain mode. Removed peak suppression status from sessions. Several minor bugfixes and improvements. Limits now also work properly with only two entries. Fixed a bug in the limit editor when adding entries above 2 GHz. Removed obsolete Spectran Server manual. Fixed an issue with peak suppression not working in some cases. Fixed replay functionality of NF data recordings. Various minor bugfixes and improvements. Auto Adjust will now pick a more reasonable scaling when no reference data exists. Spectran filemanager to display default p code files again. GPS widget to show bogus values. CSV files from the EFIS database. FTDI drivers. fixed a bug that crashed the MCS when opening the spectrum view a second time or an editor window. Windows Qt. 5 version. Windows installer. H, K, M and G to frequency input window for switching frequency units directly. RSA network authentication not working all the time. MDF calibration records. RSA devices. extend range for manual calibration offset to 1. B. allow Hz and k. Hz values to be entered directly in calibration editor. GSM and UMTS provider profiles. MDF calibration records. Trigger dialog, added support for reference traces as trigger lines and triggering on minmaxavg. Pseudo Spectran feature. KML export. added option to change update rate of Aaronia GPS Logger. GPS Logger support. UBBV calibration data. Detector control for NF devices. UI improvements to StartStop buttons for sweeping and recording. USB Spectran during MCS startup. USERIP PORT to connect to the specified remote Spectran server new RSA models only. FILE to directly start a replay from a recorded MDR file. NAME to override the regular default profile. GPS control in the sidebar to show detailed GPS information if a GPS Logger is connected. GPS information is now displayed in the Spectrum settings overlay. GPS Logger. added support for internal GPS sensor of XFRpro models. MDR recordings can now include GPS data if a GPS Logger is connected during the recording. MCS will now prevent setting frequency parameters outside the specified frequency range of a connected device. CSV format using the Save Trace button and selecting the correct file format. CSV recording of time domain only measurements note timestamps on. German, Chinese and Portuguese translations, removed Russian translation. Note that some of the more confusing features. Note that this will only be used for new Spectran RSA models produced after January 2. Spectran Network Server Utility due to various issues in the old networking code. NF preamplifiers. ICNIRP limit values above 1. MHz. improved import of CSV calibration data. Chinese translation. Spectran devices were not found in the connection manager. Settings control. NF static sensor recalibration. V5 compability mode. NF devices. added Recording action for triggers to start a MDR recording on specific conditions. NOTE due to changes in the device communication the Network Connection feature is currently not working and has. If you need that feature please use version 1. NF profile to TFT instead of Power. NF preamplifiers, and enabled calibration settings for NF Spectran devices. NOTE profile and limit editors are still experimental and somewhat unstable, so use at your own risk. Settings control. Settings control on replays. Cut Off level functionality. Channel and Sweep Profiles have been merged. The old sweepprofiles. Also the channel editor has been replaced. Calibration Data Files antenna. Calibration Data Editor added. Limit Editor has been reworked, including added support for logarithmic interpolation and real spectrum preview. The Spectrum View now supports three different modes for mouse interaction. Spectrum Control. Change Parameters Mouse Selection will adjust device and graphic parameters Start Stop Frequency, Reference. Dynamic, Double Click will switch to Zero Span mode at the clicked frequency, Right click will open a context menu. Zoom Mouse Selection will zoom the selected area of the graphic without changing device parameters, Double Click. Middle Click will reset zoom to normal. Right Click will open a context menu. Edit Markers DragDrop will move markers to different frequenciestraces, Double Click will create new markers. Right Click will remove markers also see changelog entry for 1. Generate Mapfile supports now NMEA files for GPS coordinates in addition to GPX files. NF devicesreplays. D axis trace controls disappearing randomly. Windows version was only an issue for new installs on Windows 8. NF logger files. improved peak suppression on NF. Hyper. LOG 6. 01. X. fix changing center frequency in the demodulation control. D axis controls when a NF in 3. Colt Mustang Serial Numbers. D mode is connected. Mac. OS X application bundle. NF devices. Generate Mapfile feature now also supports reading raw NMEA sentence files. UBBV calibration data. UBBV calibration data Note only new UBBV devices are supported, existing ones. MDR files with decimal digits NF. Demodulation control that replaces the old Demodulation toolbar menu. In addition to selecting the demod mode.