{"id":38995,"date":"2026-11-14T12:35:45","date_gmt":"2026-11-14T04:35:45","guid":{"rendered":"https:\/\/www.bestpcbs.com\/blog\/2026\/11\/pcb-filter-group-delay\/"},"modified":"2026-11-14T12:35:45","modified_gmt":"2026-11-14T04:35:45","slug":"pcb-filter-group-delay","status":"publish","type":"post","link":"https:\/\/www.bestpcbs.com\/blog\/2026\/11\/pcb-filter-group-delay\/","title":{"rendered":"Group Delay Guide for PCB Filters: When Ripple Is Real"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_89 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/11\/pcb-filter-group-delay\/#Group_delay_definition\" >Group delay definition<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/11\/pcb-filter-group-delay\/#Group_delay_formula\" >Group delay formula<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/11\/pcb-filter-group-delay\/#Group_delay_vs_phase_delay\" >Group delay vs phase delay<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/11\/pcb-filter-group-delay\/#Group_delay_in_filters\" >Group delay in filters<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/11\/pcb-filter-group-delay\/#Group_delay_ripple\" >Group delay ripple<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/11\/pcb-filter-group-delay\/#VNA_group_delay_measurement\" >VNA group delay measurement<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/11\/pcb-filter-group-delay\/#Group_delay_aperture\" >Group delay aperture<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/11\/pcb-filter-group-delay\/#Group_delay_dispersion\" >Group delay dispersion<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/11\/pcb-filter-group-delay\/#Frequently_asked_questions\" >Frequently asked questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/11\/pcb-filter-group-delay\/#Discuss_your_RF_PCB_requirements\" >Discuss your RF PCB requirements<\/a><\/li><\/ul><\/nav><\/div>\n<div class=\"yzp-no-index\"><\/div><p>To decide whether group delay ripple comes from a PCB filter, first specify the passband, test boundaries and VNA aperture. Measure a known reference path and repeat the filter sweep under the same conditions. A flat insertion-loss trace alone does not prove that a modulated waveform passes through without distortion.<\/p>\n<figure><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/11\/pcb-filter-group-delay-cover.jpg\" width=\"1200\" height=\"640\" style=\"max-width:100%;height:auto\" alt=\"RF filter evaluation board beside a vector network analyzer\"><figcaption>Illustrative RF test bench, not an actual measurement. Define whether the connectors belong to the device under test.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Group_delay_definition\"><\/span>Group delay definition<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Group delay describes how fast the transmission phase changes with frequency. In a band where transmission is strong enough and the phase slope is smooth over the signal bandwidth, it describes the delay of a narrowband signal envelope. The qualifier matters: a filter can delay different portions of a wide signal spectrum by different amounts, so a single number cannot describe what happens to the whole waveform.<\/p>\n<p>Consider an illustrative receive-filter board for a radio near 1 GHz. The engineering question is whether the filter and its intended launches add more delay variation than the receiver allows across the occupied band. It is not whether a second PCB route matches the phase of the first route.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Group_delay_formula\"><\/span>Group delay formula<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Group delay is minus the derivative of unwrapped transmission phase with respect to angular frequency. In degrees and hertz, estimate it as <strong>\u2212\u0394\u03c6\/(360 \u00d7 \u0394f)<\/strong> seconds when \u0394\u03c6 is in degrees. This is a finite-interval estimate, not a guarantee that the slope remains constant between the two points.<\/p>\n<p>For an instructional example, suppose unwrapped S21 phase changes from \u221282\u00b0 at 995 MHz to \u221291\u00b0 at 1,005 MHz. The difference is \u22129\u00b0 over 10 MHz, giving +2.50 ns. If the instrument shows a phase jump at its display wrap boundary, do not use that displayed jump as the physical phase difference. See <a href=\"https:\/\/helpfiles.keysight.com\/csg\/m9485a\/tutorials\/group_delay6_5.htm\" rel=\"nofollow\">Keysight\u2019s VNA group delay procedure<\/a>.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Group_delay_vs_phase_delay\"><\/span>Group delay vs phase delay<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Use group delay to judge slope and waveform timing across frequency. Use phase delay only when the absolute phase and its reference convention are defined; a wrapped angle at one tone does not establish an unambiguous delay.<\/p>\n<figure class=\"wp-block-table\">\n<table>\n<tbody>\n<tr>\n<td><strong>Metric<\/strong><\/td>\n<td><strong>Evidence and conditions<\/strong><\/td>\n<td><strong>Use it when<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Phase delay<\/td>\n<td>Negative phase divided by angular frequency, with a defined phase branch and reference plane.<\/td>\n<td>You need the equivalent delay of an individual sinusoid under that convention.<\/td>\n<\/tr>\n<tr>\n<td>Group delay<\/td>\n<td>Negative phase slope, with stated frequency interval, reference plane and usable transmission.<\/td>\n<td>You need envelope transit time or in-band delay variation.<\/td>\n<\/tr>\n<tr>\n<td>Insertion loss<\/td>\n<td>Transmission magnitude at the same reference planes and terminations.<\/td>\n<td>You need amplitude loss or want to flag low-signal regions where phase becomes unreliable.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Group_delay_in_filters\"><\/span>Group delay in filters<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A filter can meet its amplitude mask and still delay parts of a waveform unequally. Inside the occupied band, variation in phase slope can smear a fast pulse or change the shape of a modulated symbol. Compare the delay curve with the system signal bandwidth instead of averaging over the entire instrument sweep.<\/p>\n<p>For the receive board, check the occupied band with its allowed frequency offsets. A steep delay change outside that window may matter to a different operating mode, but it does not automatically fail the present mode. Conversely, do not arbitrarily trim an in-band peak simply to make the report pass.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Group_delay_ripple\"><\/span>Group delay ripple<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Peak-to-peak group delay ripple is the maximum minus the minimum delay over the declared band, using the declared measurement setup. On the illustrative board, 2.80 ns maximum and 2.35 ns minimum give 0.45 ns peak to peak. If the project allows 0.40 ns maximum, that sweep exceeds the limit by 0.05 ns. It is not a confirmed defect until the measurement is suitable for separating that margin from setup variation.<\/p>\n<figure class=\"wp-block-table\">\n<table>\n<tbody>\n<tr>\n<td><strong>Test entry<\/strong><\/td>\n<td><strong>Example only<\/strong><\/td>\n<td><strong>Reason to retain it<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Acceptance window<\/td>\n<td>990\u20131,010 MHz<\/td>\n<td>Prevents a different sweep or stopband feature from changing the result.<\/td>\n<\/tr>\n<tr>\n<td>Peak-to-peak limit<\/td>\n<td>0.40 ns<\/td>\n<td>States the actual release metric; an average is not a substitute.<\/td>\n<\/tr>\n<tr>\n<td>Aperture and point spacing<\/td>\n<td>2 MHz aperture; 0.25 MHz uniform points<\/td>\n<td>Allows repeat sweeps with the same effective differentiation interval.<\/td>\n<\/tr>\n<tr>\n<td>Decision conditions<\/td>\n<td>Named reference planes, stable connections, reference sweep and repeat data<\/td>\n<td>Helps judge whether a small apparent failure can be resolved.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<h2><span class=\"ez-toc-section\" id=\"VNA_group_delay_measurement\"><\/span>VNA group delay measurement<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Use a calibrated two-port transmission measurement and define whether connectors and launches belong to the DUT. Start with a known thru or reference coupon rated for the test band. It need not show zero delay; the concern is whether it exhibits unexpected ripple or changes on reconnection.<\/p>\n<p>Keep the cables stable, use the same port power and terminations, and retain complex S21 plus the setup file. If the specification excludes the fixture, use a validated correction for its actual geometry; a simple electrical-delay adjustment is not a substitute for removing mismatch and fixture effects. The <a href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/11\/pcb-fixture-de-embedding\/\">PCB fixture de-embedding guide<\/a> covers how to define that boundary.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Group_delay_aperture\"><\/span>Group delay aperture<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Aperture is the frequency separation over which the analyzer estimates the phase slope. A larger aperture smooths the curve but can hide a narrow feature; a smaller one resolves finer detail but can make phase noise more obvious. Do not confuse aperture with the spacing between acquired points. The instrument may express aperture as points, hertz or a percentage of span.<\/p>\n<figure><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/11\/pcb-filter-group-delay-aperture.jpg\" width=\"1200\" height=\"640\" style=\"max-width:100%;height:auto\" alt=\"Coaxial cables connected to an RF test board on a bench\"><figcaption>Illustrative test connection and screen display, not measured data. Keep the cable arrangement and reference planes fixed when comparing aperture settings.<\/figcaption><\/figure>\n<p>As a diagnostic check, repeat the sweep with two supported aperture settings while keeping the acquisition band and calibration fixed. A sharp spike that moves with settings or follows a noise floor calls for better measurement evidence. A repeatable feature may still shrink under heavier smoothing, so use the prescribed aperture for the acceptance result. Save both traces. <a href=\"https:\/\/helpfiles.keysight.com\/csg\/89600B\/Webhelp\/Subsystems\/gui\/content\/trace_format_groupdelayaperture.htm\" rel=\"nofollow\">Keysight\u2019s aperture note<\/a> also explains why edge points can disappear for wider intervals.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Group_delay_dispersion\"><\/span>Group delay dispersion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Before attributing delay variation to the board, check whether the shape persists inside the usable passband, after reconnecting the DUT, and on another representative board if the decision warrants it. Compare the trace with insertion loss and return loss: a feature near a deep transmission null can have unstable phase and should not be used as evidence of passband behavior.<\/p>\n<p>For the example, record the raw S-parameters, selected band, aperture, calibration or fixture file, curve extrema and location of the highest variation. If the reference is stable and the DUT exceeds the fixed limit in repeat tests with sufficient measurement margin, hold disposition for design review. If the reference shows similar variation, resolve the measurement problem before changing the PCB.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Frequently_asked_questions\"><\/span>Frequently asked questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3>Why does the trace drop out at the sweep ends?<\/h3>\n<p>The slope calculation may need points on both sides of the reported frequency. Sweep beyond the acceptance band so there are adequate points on either side, while retaining the actual window in the report.<\/p>\n<h3>Does flat group delay have to be zero?<\/h3>\n<p>No. A uniform delay can shift the arrival time without spreading the envelope. Check any separate latency requirement before deciding that a large constant offset is acceptable.<\/p>\n<h3>Can an S21 magnitude-only export be used?<\/h3>\n<p>No. It lacks the phase needed for the slope. Export complex S21, with frequency and port information, when the analysis will be repeated off the instrument.<\/p>\n<h3>Does more point density always cure phase wrapping?<\/h3>\n<p>It can help if large phase steps caused the ambiguity, but extra points do not improve a noisy transmission null. Verify both the spacing and the usable signal level.<\/p>\n<h3>Why does reconnecting an adapter change the result?<\/h3>\n<p>It can change the effective reference path or introduce a mismatch that was not accounted for by calibration. Record the adapter and verify a reference sweep after the connection change.<\/p>\n<h3>Can a negative value alone prove a faulty RF filter?<\/h3>\n<p>No. First check the reference convention, transmission level and phase processing. In a strongly dispersive region the phase slope can also yield an apparent negative delay without representing a signal traveling backward in time.<\/p>\n<h3>Does a TDR impedance check replace the group delay sweep?<\/h3>\n<p>No. TDR can locate impedance discontinuities, while a group delay sweep verifies transmission phase slope over the specified band. Use the two checks for different questions.<\/p>\n<h3>What goes in the production handoff?<\/h3>\n<p>Send the test boundaries, passband, limit, aperture, point spacing, fixture revision and report format. Link each result to its board revision and test state.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Discuss_your_RF_PCB_requirements\"><\/span>Discuss your RF PCB requirements<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>For a Best Technology fabrication review, send the stackup, RF launch or coupon geometry, and the intended measurement reference planes to <a href=\"mailto:sales@bestpcbs.com\">sales@bestpcbs.com<\/a>. Identify which connector and fixture structures the design includes.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Measure PCB filter group delay with a VNA. Set the passband and aperture, then separate unwanted ripple from fixture errors and trace noise.<\/p>\n","protected":false},"author":32827,"featured_media":38993,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[174],"tags":[9361,9362,413,9257],"class_list":["post-38995","post","type-post","status-publish","format-standard","hentry","category-bestpcb","tag-group-delay","tag-rf-filters","tag-rf-pcb","tag-vna-measurement"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"Measure PCB filter group delay with a VNA. 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