{"id":6679,"date":"2026-07-03T07:44:07","date_gmt":"2026-07-03T07:44:07","guid":{"rendered":"https:\/\/stardl.com\/?p=6679"},"modified":"2026-07-03T07:46:59","modified_gmt":"2026-07-03T07:46:59","slug":"the-essence-of-rf-chips-deconstructed-into-three-progressive-engineering-questions","status":"publish","type":"post","link":"https:\/\/stardl.com\/es\/the-essence-of-rf-chips-deconstructed-into-three-progressive-engineering-questions\/","title":{"rendered":"La esencia de los chips de radiofrecuencia: desglosada en tres preguntas de ingenier\u00eda progresivas"},"content":{"rendered":"<div class=\"wp-block-rank-math-toc-block has-ast-global-color-4-background-color has-background\" style=\"margin-top:var(--wp--preset--spacing--50);margin-bottom:var(--wp--preset--spacing--50);padding-top:var(--wp--preset--spacing--50);padding-right:var(--wp--preset--spacing--50);padding-bottom:var(--wp--preset--spacing--50);padding-left:var(--wp--preset--spacing--50)\" id=\"rank-math-toc\"><h2>\u00cdndice<\/h2><nav><ul><li><a href=\"#1-layer-one-device-physics-how-does-a-transistor-actually-amplify\">1. Layer One: Device Physics \u2013 How Does a Transistor Actually Amplify?<\/a><ul><li><a href=\"#1-1-ga-as-hemt-electrons-run-fast\">1.1 GaAs HEMT \u2013 Electrons Run Fast<\/a><\/li><li><a href=\"#1-2-ga-n-hemt-withstands-high-voltage\">1.2 GaN HEMT \u2013 Withstands High Voltage<\/a><\/li><\/ul><\/li><li><a href=\"#2-layer-two-circuit-architecture-from-transistor-to-functional-block\">2. Layer Two: Circuit Architecture \u2013 From Transistor to Functional Block<\/a><ul><li><a href=\"#2-1-architectural-logic-of-low-noise-amplifiers-lna\">2.1 Architectural Logic of Low\u2011Noise Amplifiers (LNA)<\/a><\/li><li><a href=\"#2-2-architectural-logic-of-power-amplifiers-pa\">2.2 Architectural Logic of Power Amplifiers (PA)<\/a><\/li><li><a href=\"#2-3-architectural-logic-of-mixers-and-switches\">2.3 Architectural Logic of Mixers and Switches<\/a><\/li><\/ul><\/li><li><a href=\"#3-layer-three-engineering-manufacturing-why-datasheet-parameters-do-not-match-board-performance\">3. Layer Three: Engineering &amp; Manufacturing \u2013 Why Datasheet Parameters Do Not Match Board Performance<\/a><ul><li><a href=\"#3-1-parasitic-effects-the-invisible-killer-of-rf-circuits\">3.1 Parasitic Effects \u2013 The \u201cInvisible Killer\u201d of RF Circuits<\/a><\/li><li><a href=\"#3-2-temperature-drift-the-underestimated-performance-killer\">3.2 Temperature Drift \u2013 The Underestimated Performance Killer<\/a><\/li><li><a href=\"#3-3-grounding-and-decoupling-the-most-overlooked-system-problem\">3.3 Grounding and Decoupling \u2013 The Most Overlooked \u201cSystem Problem\u201d<\/a><\/li><\/ul><\/li><li><a href=\"#4-back-to-stard-ls-product-logic\">4. Back to STARDL\u2019s Product Logic<\/a><\/li><li><a href=\"#final-words\">Final Words<\/a><\/li><\/ul><\/nav><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>First<\/strong>: What physical mechanism is used to amplify or switch signals? (<em>Process &amp; Device Physics<\/em>)<br><strong>Second<\/strong>: How are these physical mechanisms organized into a usable circuit? (<em>Topology &amp; Architecture<\/em>)<br><strong>Third<\/strong>: Under the constraints of high frequency, high temperature, and high power, how do we ensure this circuit works reliably and repeatably? (<em>Engineering &amp; Manufacturing<\/em>)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This article follows these three layers of logic.<\/p>\n\n\n\n<h2 id=\"1-layer-one-device-physics-how-does-a-transistor-actually-amplify\" class=\"wp-block-heading\" style=\"font-size:24px\">1. Layer One: Device Physics \u2013 How Does a Transistor Actually Amplify?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The most critical active device in an RF chip is the&nbsp;<strong>field\u2011effect transistor (FET)<\/strong>. Whether it is called HEMT, pHEMT, or MOSFET, the fundamental mechanism of signal amplification remains the same:&nbsp;<strong>controlling the channel current through the gate voltage<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, the efficiency of this \u201ccontrol\u201d varies dramatically across different process technologies.<\/p>\n\n\n\n<h3 id=\"1-1-ga-as-hemt-electrons-run-fast\" class=\"wp-block-heading has-medium-font-size\">1.1 GaAs HEMT \u2013 Electrons Run Fast<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The core of a HEMT (High Electron Mobility Transistor) is the&nbsp;<strong>heterojunction<\/strong>&nbsp;\u2013 two semiconductor materials with different bandgaps grown together, forming a&nbsp;<strong>two\u2011dimensional electron gas (2DEG)<\/strong>&nbsp;at the interface. This electron gas has extremely high mobility because the electrons do not collide with impurity atoms at the interface.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The electron mobility of GaAs HEMT can exceed&nbsp;<strong>8000 cm\u00b2\/(V\u00b7s)<\/strong>&nbsp;. This means that for the same change in gate voltage, the channel current changes more \u2013&nbsp;<strong>higher transconductance<\/strong>&nbsp;and better frequency performance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Another advantage of GaAs HEMT is its&nbsp;<strong>noise performance<\/strong>. Because electron\u2011phonon scattering in the channel is weaker, both channel thermal noise and flicker noise are lower than in silicon\u2011based devices. This is why almost all high\u2011end receive\u2011chain LNAs choose GaAs pHEMT \u2013 its physical structure is inherently \u201clow\u2011noise.\u201d<\/p>\n\n\n\n<h3 id=\"1-2-ga-n-hemt-withstands-high-voltage\" class=\"wp-block-heading has-medium-font-size\">1.2 GaN HEMT \u2013 Withstands High Voltage<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The bandgap of <a href=\"https:\/\/stardl.com\/es\/circuitos-integrados-de-microondas-de-radiofrecuencia\/dispositivos-de-potencia-gan\/\">GaN<\/a> is\u00a0<strong>3.4 eV<\/strong>, compared to\u00a0<strong>1.4 eV<\/strong>\u00a0for GaAs. The direct consequence is that GaN\u2019s breakdown field strength is an order of magnitude higher than that of GaAs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">What does higher breakdown field mean? For the same transistor size, GaN can tolerate much higher drain voltage \u2013 thus delivering much higher output power.&nbsp;<strong>Power density<\/strong>&nbsp;is several times that of GaAs. A 2022 comparative study explicitly states that GaN HEMT shows higher power and frequency capability in terms of the modified Johnson figure\u2011of\u2011merit (based on cut\u2011off frequency).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Another advantage of GaN is&nbsp;<strong>thermal stability<\/strong>. Over a temperature range of \u201340\u00b0C to +150\u00b0C, the small\u2011signal model parameters of GaN HEMT vary far less than those of GaAs devices. This means that in high\u2011power, high\u2011temperature environments like radar transmitters, GaN reliability is far superior to GaAs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The trade\u2011off between GaAs and GaN is fundamentally a trade\u2011off of physical laws<\/strong>: GaAs gives low noise and high linearity; GaN gives high power density and high temperature tolerance. There is no \u201cbetter\u201d \u2013 only \u201cmore suitable.\u201d<\/p>\n\n\n\n<h2 id=\"2-layer-two-circuit-architecture-from-transistor-to-functional-block\" class=\"wp-block-heading\" style=\"font-size:24px\">2. Layer Two: Circuit Architecture \u2013 From Transistor to Functional Block<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A transistor alone is just an amplifying element \u2013 it must be organized into specific circuit topologies to perform functions like amplification, mixing, and switching.<\/p>\n\n\n\n<h3 id=\"2-1-architectural-logic-of-low-noise-amplifiers-lna\" class=\"wp-block-heading has-medium-font-size\">2.1 Architectural Logic of Low\u2011Noise Amplifiers (LNA)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The core design challenge of an LNA is the&nbsp;<strong>conflict between noise matching and power matching<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For a given transistor, the source impedance that yields&nbsp;<strong>minimum noise figure<\/strong>&nbsp;and the one that yields&nbsp;<strong>maximum gain<\/strong>&nbsp;typically do not coincide. The designer must plot two circles on the Smith chart \u2013 a&nbsp;<strong>constant noise\u2011figure circle<\/strong>&nbsp;and a&nbsp;<strong>constant gain circle<\/strong>&nbsp;\u2013 and find a compromise.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In circuit implementation:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Source inductive degeneration<\/strong>\u00a0is the classic input matching structure for LNAs. By placing a small inductor in series with the source, the real part of the input impedance can be pulled to 50\u03a9 without increasing noise.<\/li>\n\n\n\n<li><strong>Cascode<\/strong>\u00a0topology is a common choice to improve bandwidth and isolation. The common\u2011gate stage eliminates the Miller effect, flattening high\u2011frequency gain.<\/li>\n<\/ul>\n\n\n\n<h3 id=\"2-2-architectural-logic-of-power-amplifiers-pa\" class=\"wp-block-heading has-medium-font-size\">2.2 Architectural Logic of Power Amplifiers (PA)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The core design challenge of a PA is the&nbsp;<strong>eternal conflict between efficiency and linearity<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The physical root of this conflict lies in the transistor\u2019s operating region:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Class<\/th><th class=\"has-text-align-left\" data-align=\"left\">Conduction Angle<\/th><th class=\"has-text-align-left\" data-align=\"left\">Theoretical Efficiency<\/th><th class=\"has-text-align-left\" data-align=\"left\">Linearity<\/th><\/tr><\/thead><tbody><tr><td>A<\/td><td>360\u00b0<\/td><td>\u226450%<\/td><td>Best<\/td><\/tr><tr><td>AB<\/td><td>180\u00b0\u2013360\u00b0<\/td><td>50%\u201378.5%<\/td><td>Good<\/td><\/tr><tr><td>B<\/td><td>180\u00b0<\/td><td>78.5%<\/td><td>Crossover distortion<\/td><\/tr><tr><td>C<\/td><td>&lt;180\u00b0<\/td><td>&gt;78.5%<\/td><td>Poor<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Class\u2011A amplifiers offer the best linearity, but the theoretical maximum efficiency is only 50% \u2013 the other 50% of DC power becomes heat. Class\u2011C amplifiers can achieve very high efficiency, but the output signal is severely distorted.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Engineering approaches to mitigate this trade\u2011off include:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Doherty architecture<\/strong>: Uses two transistors \u2013 the main amplifier operates alone at low power, and the auxiliary amplifier kicks in at high power. This architecture maintains relatively high efficiency even in power back\u2011off regions, making it the dominant choice for base\u2011station PAs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Power back\u2011off<\/strong>: Operating the PA far below its saturated output power to exchange efficiency for linearity. However, the penalty is a sharp drop in efficiency.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Digital pre\u2011distortion (DPD)<\/strong>: Before the signal enters the PA, a distortion inverse to the PA\u2019s nonlinear characteristics is pre\u2011applied, and the two cancel out to produce a linear output.<\/p>\n\n\n\n<h3 id=\"2-3-architectural-logic-of-mixers-and-switches\" class=\"wp-block-heading has-medium-font-size\">2.3 Architectural Logic of Mixers and Switches<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The core of a mixer is&nbsp;<strong>nonlinearity<\/strong>&nbsp;\u2013 using the nonlinear characteristics of transistors to multiply two signals of different frequencies, producing sum and difference frequencies.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Passive mixers<\/strong>\u00a0use diodes or switch\u2011type transistors. They offer good linearity and low noise, but require high local\u2011oscillator drive power.<\/li>\n\n\n\n<li><strong>Active mixers<\/strong>\u00a0use transistors to provide gain. They offer higher integration but slightly worse noise and linearity.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The core of an RF switch is the&nbsp;<strong>trade\u2011off between isolation and insertion loss<\/strong>. From SPDT to SP6T, insertion loss increases with the number of ports. STARDL\u2019s high\u2011isolation digital RF switches (up to SP6T) maintain low insertion loss and high isolation from DC to 40 GHz. The design goal is to&nbsp;<strong>simultaneously minimise insertion loss and maximise isolation across a wide frequency range<\/strong>.<\/p>\n\n\n\n<h2 id=\"3-layer-three-engineering-manufacturing-why-datasheet-parameters-do-not-match-board-performance\" class=\"wp-block-heading\" style=\"font-size:24px\">3. Layer Three: Engineering &amp; Manufacturing \u2013 Why Datasheet Parameters Do Not Match Board Performance<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This is the most common frustration for RF engineers: the S\u2011parameters on the datasheet are measured on a&nbsp;<strong>wafer\u2011level probe station<\/strong>&nbsp;\u2013 probes directly contacting the chip\u2019s pads. But on your PCB, the chip goes through packaging, wire bonding, and traces \u2013 each step introduces additional parasitic parameters.<\/p>\n\n\n\n<h3 id=\"3-1-parasitic-effects-the-invisible-killer-of-rf-circuits\" class=\"wp-block-heading has-medium-font-size\">3.1 Parasitic Effects \u2013 The \u201cInvisible Killer\u201d of RF Circuits<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">At GHz frequencies,&nbsp;<strong>physical trace dimensions are already comparable to the signal wavelength<\/strong>. A 1\u2011mm bond wire has an inductance of approximately&nbsp;<strong>1 nH<\/strong>&nbsp;at 10 GHz, presenting an inductive reactance of about&nbsp;<strong>63 \u03a9<\/strong>&nbsp;\u2013 close to the system\u2019s characteristic impedance. This means the bond wire itself alters the circuit\u2019s matching condition.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">What makes RFIC design special is that&nbsp;<strong>parasitic effects are first\u2011order, not second\u2011order<\/strong>&nbsp;influences on performance. This is why RFIC design requires&nbsp;<strong>iterative electromagnetic simulation, parasitic extraction, and package modelling<\/strong>&nbsp;throughout the entire design process.<\/p>\n\n\n\n<h3 id=\"3-2-temperature-drift-the-underestimated-performance-killer\" class=\"wp-block-heading has-medium-font-size\">3.2 Temperature Drift \u2013 The Underestimated Performance Killer<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Datasheet typical values are measured at&nbsp;<strong>room temperature (25\u00b0C)<\/strong>&nbsp;. But your system may need to operate from \u201340\u00b0C to +85\u00b0C or even wider.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A 2016 study compared the small\u2011signal parameter variations of GaAs and GaN HEMTs over the \u201340\u00b0C to 150\u00b0C range. The conclusion:&nbsp;<strong>the temperature coefficients of the two device types are completely different<\/strong>. The&nbsp;<strong>intrinsic capacitances<\/strong>&nbsp;of GaAs change significantly with temperature, while those of GaN change much less.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This means:&nbsp;<strong>GaAs devices require larger performance margins across temperature<\/strong>, while GaN\u2019s stability at high temperatures is a physical advantage.<\/p>\n\n\n\n<h3 id=\"3-3-grounding-and-decoupling-the-most-overlooked-system-problem\" class=\"wp-block-heading has-medium-font-size\">3.3 Grounding and Decoupling \u2013 The Most Overlooked \u201cSystem Problem\u201d<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">El&nbsp;<strong>return path<\/strong>&nbsp;of an RF signal must closely follow the signal path. If the ground impedance is too high or the loop path is too long, a large loop is formed, introducing radiation and coupling.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Decoupling capacitor selection is not simply \u201cthe bigger, the better.\u201d RF chips \u2013 especially PAs in pulsed mode \u2013 draw&nbsp;<strong>dynamic current<\/strong>. Different frequencies of noise require different capacitance values to filter, typically requiring a combination across three orders of magnitude (pF, nF, \u00b5F).<\/p>\n\n\n\n<h2 id=\"4-back-to-stard-ls-product-logic\" class=\"wp-block-heading\" style=\"font-size:24px\">4. Back to STARDL\u2019s Product Logic<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">STARDL\u2019s RF and microwave IC portfolio \u2013 ranging from bare die to packaged devices to GaN power devices \u2013 covers the DC to 50 GHz frequency spectrum. The three product categories address distinct engineering scenarios:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Matriz desnuda<\/strong>&nbsp;\u2013 Designed for design teams that pursue ultimate performance and have micro\u2011assembly capabilities. Removing the package eliminates parasitics, but users must handle bonding and assembly themselves.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><a href=\"https:\/\/stardl.com\/es\/circuitos-integrados-de-microondas-de-radiofrecuencia\/circuitos-integrados-empaquetados\/\">Circuitos integrados encapsulados<\/a><\/strong>\u00a0\u2013 Designed for high\u2011efficiency, high\u2011reliability volume production. Ceramic packaging suits military and aerospace applications; plastic packaging suits high\u2011volume commercial production.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><a href=\"https:\/\/stardl.com\/es\/circuitos-integrados-de-microondas-de-radiofrecuencia\/dispositivos-de-potencia-gan\/\">Dispositivos de potencia de GaN<\/a><\/strong>\u00a0\u2013 Designed for radar transmitters and electronic warfare systems that require \u201chigh\u2011power output.\u201d GaN\u2011on\u2011SiC substrates provide excellent thermal conductivity, enabling high power density.<\/p>\n\n\n\n<h2 id=\"final-words\" class=\"wp-block-heading\" style=\"font-size:24px\">Final Words<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">RF chips are not mysterious. They are simply&nbsp;<strong>the extreme optimisation of electrical signal processing efficiency under given physical constraints<\/strong>&nbsp;\u2013 process, material, temperature, and frequency. GaAs gives low noise; GaN gives high power; CMOS gives low cost and high integration. Each has its boundaries; none fully covers the others. Understanding the physical logic and engineering constraints at each layer \u2013 device physics \u2192 circuit architecture \u2192 engineering manufacturing \u2013 transforms component selection from a simple \u201cwhich has higher gain\u201d comparison into a systematic trade\u2011off decision: \u201cdo I prioritise power or noise, cost or performance, integration or flexibility?\u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>","protected":false},"excerpt":{"rendered":"<p>First: What physical mechanism is used to amplify or switch signals? (Process &amp; Device Physics)Second: How are these physical mechanisms [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":6681,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[86],"tags":[455,451,452,453,454,450,445],"class_list":["post-6679","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technical-documentation","tag-chip-selection","tag-gaas-hemt","tag-gan-hemt","tag-low-noise-amplifier","tag-power-amplifier","tag-rf-chips","tag-rf-front-end"],"_links":{"self":[{"href":"https:\/\/stardl.com\/es\/wp-json\/wp\/v2\/posts\/6679","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/stardl.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/stardl.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/stardl.com\/es\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/stardl.com\/es\/wp-json\/wp\/v2\/comments?post=6679"}],"version-history":[{"count":1,"href":"https:\/\/stardl.com\/es\/wp-json\/wp\/v2\/posts\/6679\/revisions"}],"predecessor-version":[{"id":6680,"href":"https:\/\/stardl.com\/es\/wp-json\/wp\/v2\/posts\/6679\/revisions\/6680"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/stardl.com\/es\/wp-json\/wp\/v2\/media\/6681"}],"wp:attachment":[{"href":"https:\/\/stardl.com\/es\/wp-json\/wp\/v2\/media?parent=6679"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/stardl.com\/es\/wp-json\/wp\/v2\/categories?post=6679"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/stardl.com\/es\/wp-json\/wp\/v2\/tags?post=6679"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}