{"id":15025,"date":"2026-07-24T09:30:00","date_gmt":"2026-07-24T07:30:00","guid":{"rendered":"https:\/\/tps-elektronik.com\/?p=15025"},"modified":"2026-06-24T04:49:44","modified_gmt":"2026-06-24T02:49:44","slug":"what-is-tps-low-noise-programmable-dc-power-supply-for-precision-analog-circuit-testing-and-why-it-is-vital-for-sensitive-measurement-accuracy","status":"publish","type":"post","link":"https:\/\/tps-elektronik.com\/en\/what-is-tps-low-noise-programmable-dc-power-supply-for-precision-analog-circuit-testing-and-why-it-is-vital-for-sensitive-measurement-accuracy\/","title":{"rendered":"What Is TPS Low Noise Programmable DC Power Supply for Precision Analog Circuit Testing and Why It Is Vital for Sensitive Measurement Accuracy?"},"content":{"rendered":"<article class=\"product-blog\" lang=\"en\"><header>\n<p>For system integrators, panel builders, and engineering\u2011driven procurement teams, selecting a power supply for precision analog testing is not only about voltage and current. It also involves spectral purity, ground\u2011loop management, remote sensing accuracy. And whether the PSU introduces artifacts that obscure the very signals the engineer is trying to measure. When a 24\u2011bit ADC evaluation board powered by a noisy switching supply, the last three bits of the measurement are lost in power\u2011supply\u2011induced noise. Which rendering the precision of the converter meaningless.<\/p>\n<p>The <a href=\"https:\/\/www.shop-tps.com\/shop\/category\/programmable-power-14\" target=\"_blank\" rel=\"noopener noreferrer nofollow\"><strong>TPS low noise programmable DC power supply<\/strong><\/a> series addresses these challenges at their root. By combining advanced linear regulation, high\u2011resolution digital control. And meticulous attention to conducted and radiated EMI, TPS delivers clean, stable DC power that preserves the integrity of sensitive analog measurements. This article examines the architecture and key characteristics of these supplies and explains why they are the preferred choice for precision analog circuit testing.<\/p>\n<\/header><nav class=\"toc\" aria-label=\"Table of Contents\">\n<h2 id=\"toc-en\">Table of Contents<\/h2>\n<ol>\n<li><a href=\"#en-why\">Why power supply noise limits measurement accuracy<\/a><\/li>\n<li><a href=\"#en-tps\">TPS low noise programmable power supply architecture<\/a><\/li>\n<li><a href=\"#en-ripple\">Ripple, noise, and spectral purity<\/a><\/li>\n<li><a href=\"#en-sense\">Remote sensing and load regulation<\/a><\/li>\n<li><a href=\"#en-control\">Digital control, resolution, and programming<\/a><\/li>\n<li><a href=\"#en-compliance\">EMC, safety, and system integration<\/a><\/li>\n<li><a href=\"#en-applications\">Application scenarios: analog circuit test, sensor evaluation, and metrology<\/a><\/li>\n<li><a href=\"#en-rfq\">RFQ checklist for precision programmable DC supplies<\/a><\/li>\n<li><a href=\"#en-faq\">Frequently Asked Questions<\/a><\/li>\n<\/ol>\n<\/nav>\n<section>\n<h2 id=\"en-why\">Why power supply noise limits measurement accuracy?<\/h2>\n<p>In precision analog testing, every millivolt of noise on the power rail couples into the device under test (DUT) through its power supply rejection ratio (PSRR). Which is finite and degrades at higher frequencies. A switching power supply with a typical output ripple of 50\u202fmV peak\u2011to\u2011peak can inject broadband noise into a high\u2011gain amplifier chain. Which appearing as an elevated noise floor or discrete spurs in an FFT spectrum. For a 16\u2011bit ADC operating at a 2.5\u202fV reference, one least significant bit (LSB) represents 38\u202f\u00b5V. A ripple of just 1\u202fmV effectively buries 26 LSBs.<\/p>\n<p>A <strong>low noise programmable DC supply<\/strong> addresses this by minimizing both the low\u2011frequency ripple (typically at the mains harmonic frequencies) and the high\u2011frequency switching noise (from the internal DC\u2011DC converter). The TPS approach, exemplified by the <a href=\"https:\/\/tps-elektronik.com\/en\/ea-psi-9000-dt-desktop-programmable-dc-power-supply\/\">EA\u2011PSI\u202f9000\u202fDT desktop series<\/a> and the high\u2011power <a href=\"https:\/\/www.shop-tps.com\/shop\/category\/programmable-power-14\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">rack\u2011mount series<\/a>. Which uses a combination of active filtering, linear post\u2011regulation. And careful PCB layout to achieve output noise levels that are orders of magnitude below standard switching supplies. For a broader overview of the technology options, refer to the guide on <a href=\"https:\/\/tps-elektronik.com\/en\/top-programmable-power-supply-options-for-every-need\/\">top programmable power supply options<\/a>.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-14784\" src=\"https:\/\/tps-elektronik.com\/wp-content\/uploads\/2026\/06\/Multi\u2011Unit-Parallel-Bidirectional-Power-Supply-System-1920-kW-ATE-Rack-Configuration-\u2013-TPS-Elektronik-1.jpg\" alt=\"Multi\u2011Unit Parallel Bidirectional Power Supply System 1920 kW ATE Rack Configuration \u2013 TPS Elektronik Parallel\u2011Bidirektionales\u2011Netzteil\u2011System 1920 kW ATE Rack\u2011Konfiguration \u2013 TPS Elektronik\" width=\"1920\" height=\"1004\" \/><\/p>\n<\/section>\n<section>\n<h2 id=\"en-tps\">TPS low noise programmable power supply architecture<\/h2>\n<p>The TPS programmable power supply platform built on a high\u2011efficiency front\u2011end AC\u2011DC converter with active power factor correction, followed by a precision linear or actively filtered output stage. This hybrid architecture achieves an overall efficiency of up to 95.8\u202f% while maintaining output noise comparable to a pure linear supply. The key to this performance is the digital control loop, which uses high\u2011resolution ADCs and DACs to regulate the output with precision. And an autoranging output stage that maintains low output impedance across a wide voltage and current range.<\/p>\n<p>The platform supports multiple regulation modes\u2014constant voltage (CV), constant current (CC), constant power (CP), and constant resistance (CR). Which allowing the supply to emulate a variety of source characteristics. Fast crossover between modes ensures that the supply does not overshoot or undershoot when the DUT transitions from one operating region to another. TPS supplies are available in a full range of form factors. Which detailed in the <a href=\"https:\/\/www.shop-tps.com\/shop\/category\/programmable-power-14\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">programmable power supply category<\/a>.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-15038\" src=\"https:\/\/tps-elektronik.com\/wp-content\/uploads\/2026\/06\/0724-2-programmable-power-supply-dc-EA-PU-10360-480-6U-60000W.jpg\" alt=\"programmable power supply dc\" width=\"800\" height=\"600\" \/><\/p>\n<\/section>\n<section>\n<h2 id=\"en-ripple\">Ripple, noise, and spectral purity<\/h2>\n<p>Output ripple specified as a combination of low\u2011frequency ripple (related to the mains frequency and its harmonics) and high\u2011frequency noise (generated by the switching action of the internal converter). TPS supplies achieve typical ripple figures in the low millivolt range. The noise further characterized by its spectral content: unlike a simple linear supply. Which may have dominant 50\/60\u202fHz hum, a high\u2011quality programmable supply must also suppress noise at frequencies well into the MHz range. Where switching artifacts could interfere with sensitive RF or high\u2011speed digital circuits on the DUT.<\/p>\n<p>The TPS low\u2011noise design incorporates output filtering and shielding that effectively contains this high\u2011frequency energy, ensuring that the supply does not become a source of radiated EMI in the test setup. This is particularly important when multiple instruments are operating in close proximity within a test rack.<\/p>\n<\/section>\n<section>\n<h2 id=\"en-sense\">Remote sensing and load regulation<\/h2>\n<p>Even a perfectly quiet power supply can deliver an incorrect voltage to the DUT if the voltage drop in the load leads is not compensated. At a load current of 10\u202fA, a total lead resistance of just 10\u202fm\u03a9 (easily reached with a meter of thin test leads) introduces a 100\u202fmV voltage error\u2014catastrophic for a circuit expecting 3.300\u202fV. TPS programmable supplies feature remote sense (Kelvin) connections that measure the voltage directly at the DUT terminals and adjust the output to compensate for lead losses in real time. This 4\u2011wire connection scheme is standard practice in precision measurement and is supported across the TPS range.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-14824\" src=\"https:\/\/tps-elektronik.com\/wp-content\/uploads\/2026\/06\/2u-20260617-3.jpg\" alt=\"\" width=\"1536\" height=\"1024\" srcset=\"https:\/\/tps-elektronik.com\/wp-content\/uploads\/2026\/06\/2u-20260617-3.jpg 1536w, https:\/\/tps-elektronik.com\/wp-content\/uploads\/2026\/06\/2u-20260617-3-600x400.jpg 600w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/><\/p>\n<\/section>\n<section>\n<h2 id=\"en-control\">Digital control, resolution, and programming<\/h2>\n<p>Precision testing is rarely a static affair. An engineer may need to sweep the supply voltage from 1.8\u202fV to 5.0\u202fV in 10\u202fmV steps while logging the DUT\u2019s current consumption. TPS supplies provide high\u2011resolution programming (typically 16\u2011bit or better on the setpoint DACs) and measurement readback (with accuracy \u22640.05\u202f% FS for voltage and \u22640.1\u202f% FS for current). Built\u2011in USB and Ethernet interfaces as standard allow direct SCPI command control, while optional fieldbus modules (CAN, Profibus, EtherCAT, Modbus) enable integration into larger industrial ATE systems. This makes them suitable not only for bench\u2011top R&amp;D but also for automated production test systems.<\/p>\n<\/section>\n<section>\n<h2 id=\"en-compliance\">EMC, safety, and system integration<\/h2>\n<p>A low\u2011noise supply must not only be quiet on its output but also electromagnetically compatible with its environment. TPS programmable supplies meet the conducted and radiated emission limits of EN\u202f55032 Class\u202fA (CISPR\u202f32), ensuring that they do not interfere with nearby sensitive equipment. For the immunity side, the supplies are designed to withstand the test levels of the <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/29449\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">IEC\u202f61000\u20114\u2011x<\/a> series. Safety is assured through compliance with EN\/IEC\/UL\u202f61010\u20111, the harmonized standard for measurement, control, and laboratory equipment. TPS supplies are housed in IP20 enclosures, with rack\u2011mount options available from <a href=\"https:\/\/www.shop-tps.com\/shop\/category\/programmable-power-1u-programmable-dc-power-186\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">1U<\/a> to <a href=\"https:\/\/www.shop-tps.com\/shop\/category\/programmable-power-6u-programmable-dc-power-193\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">6U<\/a> form factors.<\/p>\n<\/section>\n<section>\n<h2 id=\"en-applications\">Application scenarios: analog circuit test, sensor evaluation, and metrology<\/h2>\n<ul>\n<li><strong>Precision analog and mixed\u2011signal IC evaluation<\/strong>: Providing clean power to op\u2011amps, ADCs, DACs, and voltage references during characterization.<\/li>\n<li><strong>Sensitive sensor testing<\/strong>: Powering strain gauges, photodiodes, and MEMS sensors where power supply noise directly limits resolution.<\/li>\n<li><strong>Metrology and calibration laboratories<\/strong>: Serving as a stable, programmable voltage source for calibrating multimeters and data acquisition systems.<\/li>\n<li><strong>Low\u2011noise RF and microwave circuit testing<\/strong>: Supplying bias voltages to LNAs, mixers, and VCOs without introducing unwanted modulation.<br \/><img decoding=\"async\" class=\"alignnone size-full wp-image-15045\" src=\"https:\/\/tps-elektronik.com\/wp-content\/uploads\/2026\/06\/Ultra-Low-Ripple-Noise-Comparison-Graph-Programmable-DC-Supply-vs-Standard-PSU-2.jpg\" alt=\"Ultra Low Ripple Noise Comparison Graph Programmable DC Supply vs Standard PSU Ultra\u2011Niedrige Restwelligkeit Rauschvergleichsdiagramm Programmierbares DC\u2011Netzteil vs Standard\u2011PSU\" width=\"1920\" height=\"1078\" \/><\/li>\n<\/ul>\n<\/section>\n<section>\n<h2 id=\"en-rfq\">RFQ checklist for precision programmable DC supplies<\/h2>\n<ul>\n<li><strong>Voltage and current range<\/strong>: Maximum voltage and current required, and whether autoranging is beneficial.<\/li>\n<li><strong>Noise and ripple specification<\/strong>: Maximum acceptable output ripple and noise (mVpp or mVrms).<\/li>\n<li><strong>Programming resolution<\/strong>: Required setpoint resolution (e.g., 1\u202fmV, 0.1\u202fmA).<\/li>\n<li><strong>Remote sense<\/strong>: Is 4\u2011wire Kelvin connection required?<\/li>\n<li><strong>Interfaces<\/strong>: USB, Ethernet, or specific fieldbus (CAN, Profibus, etc.).<\/li>\n<li><strong>Form factor<\/strong>: Desktop, 1U, 2U, or other rack\u2011mount format.<\/li>\n<li><strong>Quantities and schedule<\/strong>: Prototype, pilot, and series volumes.<\/li>\n<\/ul>\n<p><a href=\"https:\/\/www.shop-tps.com\/shop\/category\/programmable-power-14\" target=\"_blank\" rel=\"noopener noreferrer nofollow\"><strong>Browse TPS programmable power supplies \u2192<\/strong><\/a><\/p>\n<\/section>\n<section>\n<h2 id=\"en-faq\">Frequently Asked Questions<\/h2>\n<p><strong>What is the typical output ripple of a TPS low\u2011noise programmable power supply?<\/strong><br \/>The TPS low\u2011noise supply achieves ripple and noise in the low single\u2011digit millivolt range, making it suitable for powering sensitive analog circuits.<\/p>\n<p><strong>Does TPS offer a pure linear power supply?<\/strong><br \/>TPS supplies utilize advanced filtering and regulation techniques to deliver noise performance approaching that of a pure linear supply, while offering the efficiency and programmability of a modern digital platform. For the most sensitive applications, TPS can recommend the optimal model from its comprehensive portfolio.<\/p>\n<p><strong>How does remote sense improve measurement accuracy?<\/strong><br \/>Remote sense compensates for the voltage drop in the load leads, ensuring that the voltage at the DUT terminals is exactly the programmed value, independent of load current.<\/p>\n<p><strong>Where can I find the complete technical specifications?<\/strong><br \/>Datasheets and application notes are available on the <a href=\"https:\/\/www.shop-tps.com\/shop\/category\/programmable-power-14\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">TPS programmable power supply category page<\/a> or through the <a href=\"https:\/\/www.shop-tps.com\/shop\/category\/programmable-power-desktop-programmable-dc-power-192\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">desktop supply page<\/a>.<\/p>\n<\/section>\n<footer style=\"background: #2d5797; padding: 30px; border-radius: 14px; margin-top: 40px;\">\n<p style=\"color: #ffffff; font-size: 16px; line-height: 1.6; margin: 0;\"><strong>Next step:<\/strong> Specify a programmable power supply that delivers the clean, stable DC your precision analog circuits demand. <a style=\"color: #ffffff; font-weight: 600; text-decoration: underline; display: block; margin-top: 10px;\" href=\"https:\/\/www.shop-tps.com\/shop\/category\/programmable-power-14\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">Browse TPS programmable power supplies \u2192<\/a><\/p>\n<\/footer><\/article>\n\n<style id=\"wpforms-css-vars-4659-block-09bc6774-e7fd-4a3c-9b2f-3d56b0c364d5\">\n\t\t\t\t#wpforms-4659.wpforms-block-09bc6774-e7fd-4a3c-9b2f-3d56b0c364d5 {\n\t\t\t\t--wpforms-field-size-input-height: 43px;\n--wpforms-field-size-input-spacing: 15px;\n--wpforms-field-size-font-size: 16px;\n--wpforms-field-size-line-height: 19px;\n--wpforms-field-size-padding-h: 14px;\n--wpforms-field-size-checkbox-size: 16px;\n--wpforms-field-size-sublabel-spacing: 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It also involves spectral purity, ground\u2011loop management, remote sensing accuracy. And whether the PSU introduces artifacts that obscure the very signals the engineer is trying to measure. When a 24\u2011bit ADC\u2026 <a href=\"https:\/\/tps-elektronik.com\/en\/what-is-tps-low-noise-programmable-dc-power-supply-for-precision-analog-circuit-testing-and-why-it-is-vital-for-sensitive-measurement-accuracy\/\">Read More &raquo;<\/a><\/p>\n","protected":false},"author":9,"featured_media":15038,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[53],"tags":[],"class_list":["post-15025","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-production"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What Is TPS Low Noise Programmable DC Power Supply for Precision Analog Circuit Testing and Why It Is Vital for Sensitive Measurement Accuracy? - TPS<\/title>\n<meta name=\"description\" content=\"TPS low noise programmable DC power supply deliver clean, stable power for precision analog circuit testing. 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