TDFS Loop Stability for Buck DC to DC Converter - Switching Designer https://explore.partquest.com/node/13736 <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/13736"></iframe> Title Description <p>This design demonstrates the use of the TDFS (Time Domain Frequency Sweep) simulation method, to measure the open-loop frequency response of an operating closed-loop system containing switching elements.</p><p>The stability of the "Buck DC to DC Converter - Switching" design is assessed. This is a switching circuit, it does not use a state-average model for the modulator, so the standard AC Analysis method cannot be used. Rather, the frequency response is generated from time-domain simulation results. The TDFS approach can also be used for systems that contain sampling or digital control aspects.</p><p>This particular example is directly comparable to the design titled "TDFS Loop Stability for Buck DC to DC Converter - State Average". In that design, both the TDFS and AC Analysis methods are used to measure the open loop transfer function of an equivalent non-switching circuit.</p><p>Note that the approach used to characterize the loop stability, by injecting a small sinusoidal stimulus signal in series with the loop and then measuring the complex ratio of the ground referenced return signal to the injected signal, is described in:</p><p>D. Venable, “Testing Power Sources for Stability”, Venable technical paper #1, Venable Industries</p> About text formats Tags Buck Convertercomponent stressOp-Amp Lead-Lag CompensatorSwitching ConverterMCH6337 P-Channel MOSFETNCV20071 Op-AmpNRVBA130LT3G Schottky Power RectifierMSS1583-105KE_ Power InductorPEG127KA3110Q Electrolytic CapacitorTDFS Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None -
Switched-Capacitor Filter Time-Domain Response Designer https://explore.partquest.com/node/12801 <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/12801"></iframe> Title Description <p>This design compares two different implementations of a low-pass filter. One is just a simple RC filter circuit with 1 kHz cut-off frequency. The other is an equivalent filter using a switched-capacitor implementation.</p><p>See also http://www.systemvision.com/design/switched-capacitor-filter-frequency-response-using-tdfs to see a technique for measuring the frequency response of the filters.</p> About text formats Tags switched capacitorFrequency ResponseTDFS Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None -
Switched-Capacitor Filter Step Response Designer https://explore.partquest.com/node/708 <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/708"></iframe> Title Description <p>This design shows the use of the TDFS (Time Domain Frequency Sweep) method to measure the frequency response of two low-pass filters. One is just a simple RC filter circuit with 1 kHz cut-off frequency. The other is an equivalent filter using a switched-capacitor implementation.</p><p>Both small-signal AC (frequency domain) and TDFS (time-domain) analyses are run, and both give the same results for the RC filter. However, because of the switching aspect of the switched-capacitor filter, the results of the AC analysis are meaningless for that circuit. However, the TDFS approach is valid for that filter also, as well as for any other circuit or system containing sampled data or digital content.</p> About text formats Tags switched capacitorFrequency ResponseTDFS Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None -
TDFS LPF Test Designer https://explore.partquest.com/node/689 <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/689"></iframe> Title Description <p>Time Domain Frequency Response test of Switched capacitor filter built with Triad Semiconductor configurable IP</p> About text formats Tags Triad SemiconductorfilterlpfTDFS Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None -
TDFS LPF Test Designer https://explore.partquest.com/node/666 <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/666"></iframe> Title Description <p>Time Domain Frequency Response test of Switched capacitor filter built with Triad Semiconductor configurable IP</p> About text formats Tags Triad SemiconductorfilterlpfTDFS Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None -
TDFS Loop Stability for Buck DC to DC Converter - State Average Designer https://explore.partquest.com/node/593 <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/593"></iframe> Title Description <p>This design uses both TDFS and standard AC Analysis methods to assess the stability of a closed-loop system. The design is the "Buck DC to DC Converter", using a state-average model for the modulator function. </p><p>The use of state-average models supports AC Analysis, but TDFS (Time Domain Frequency Sweep) is also used to show the equivalency of the methods. Note that the TDFS approach can be used for systems that do not support AC Analysis, such as switching circuits or systems that contain sampling or digital control aspects. This particular example is directly comparable to the design "TDFS Loop Stability for Buck DC to DC Converter - Switching". In that design, the TDFS method is used to measure the open loop transfer function of an operational switching circuit.</p><p>Note that the approach used to characterize the loop stability, by injecting a small sinusoidal stimulus signal in series with the loop and then measuring the complex ratio of the ground referenced return signal to the injected signal, is described in:</p><p>D. Venable, “Testing Power Sources for Stability”, Venable technical paper #1, Venable Industries</p> About text formats Tags Buck ConverterState-AverageAC AnalysisTDFSLoop StabilityVenable Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None -
