[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-561113-105":59,"doc-detail-561113-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","13-ghz-prescaler-design","1.3 GHz Prescaler - Design","","1.3 GHz frequency prescaler circuit and construction details for delivering a clean rectangular TTL-level signal up to 1.3 GHz. Designed to extend the operating range of many frequency counters that typically fail above 10 MHz by providing switchable measurement ranges and a scalable output. The input signal is conditioned by diode limiting, processed through two amplification paths, gated by a NAND Schmitt trigger, and further divided using decade counters, with optional IC scaling factors (U664B or SDA4211).",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":30,"@type":76,"position":81},"https://docshare.wps.com/document/technology/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/13-ghz-prescaler-design/561113/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/13-ghz-prescaler-design/561113.png","ImageObject",300,407,{"name":92,"@type":93},"Stanford","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-19","2026-10-12",true,{"@type":102,"interactionType":103,"userInteractionCount":81},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What frequency range does the 1.3 GHz prescaler support?","Question",{"text":112,"@type":113},"The prescaler is designed to deliver a clean rectangular TTL-level signal at frequencies up to 1.3 GHz.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How is the input signal limited before processing?",{"text":117,"@type":113},"Anti-parallel connected diodes limit the input level to not more than ±700 mV before it is applied to IC3.",{"name":119,"@type":110,"acceptedAnswer":120},"Which scaling ICs can be used and what do they do?",{"text":121,"@type":113},"The scaler IC can be either the Telefunken Type U664B (divides by 64) or the Siemens Type SDA4211 (divides by 64 or 256 depending on the potential at pin 5).","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},561113,1792145081,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":29,"category_name":30,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":81,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":81,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":143,"read_time":39},2336477552062,"https://ap-avatar.wpscdn.com/davatar_994ba38a5ba835b3df7d355c54d3ed8d","put of the cascaded threesome is thus a signal of frequencyf:1000  \n# 1.3GHZ PRESCALER\n\nTheother partof theinput signalis appliedvia L₁and C₂to I₁.which,connected as ancommon-emitter circuit,behaves exactly likean inverting opamp The voltage amplifi-cation of the stage is roughly the same as theopen-loop amplification of the transistor,butit is dependent on the source impedanceDiode D₁limits the negative half of the sig-nal to not more than-700mV.  \nDesign by P.Esser  \nNot only do the majority of frequency counters found insmaller workshops and laboratories not operate above10 MHz,but usually they cannot be modified to work at higherfrequencies either.To overcome that problem,here is aprescaler that delivers a clean rectangular signal at TTL levelat frequencies up to 1.3 GHz and which can be used withvirtually any frequency counter.  \nThe output of the stage is taken from thecollector of I₁and then further amplified inI₂,whichisalsoconnected asacommon-emit-ter circuit.It is then taken from the collectorof T₂and applied to NAND Schmitt triggerIC1b,which,with theothet three NANDgates,ensures cleanedges and correct gating of thetwosignals WhenswitchS is open,the orig-inal signal(s)is available at theoutput;whenit is closed,the scaled down signal (f:1000)is at the output socket.  \njump link are not required  \nHE prescaler proposedhere offersseveralsurement range of the frequency counter towhich it is linked and,secondly,it makes itpossible to use a much shorter cable betweencounter and instrument on test—see Fig 1A disadvantage is,of course,that,to see these!  d meteringrange,youmustlookatboththe counter and the prescaler  \nThe measured signal(frequency f:64)isavailable at pin 6,from where it is applied topotentialdividerR₇-Rg-P₁From there itis fedtoamplifiet T₃,whoseoutputisappliedto thefitst of three cascaded Type 74LS90 decadecounters,IC₄,IC.s,and IC₂  \n# Construction\n\nPopulating the printed-circuit board shownin Fig 4 is straightforward,but greatet carethan usual isrequired around theinputsocketwhere surface-mount components are usedInductor L₁must be wound by the constructor It consists of 2-3 turns enamelled copperwire(dia 0.4 mm)on a small ferrite core.  \nEachof thesecounters dividesitsinputsig-nalby25.Thissomewhat unusualscaling fac-tor comes about as follows The upper halfof the IC divides by 5.For every five inputpulses,the Qs output goes high twice;inother words,the Q8 output delivers an out-put pulse for every 2.5 input pulses The out-  \n## Scaler ICs\n\nA first scaling down of the input signal is ef-fected by a chip specially designed for thispurpose Ihis can be either the TelefunkenType U664B or the Siemens Type SDA4211Block diagrams of these circuits are shownin Fig 2  \nThe U664B was originally developed foruse in the frequency synthesizer of a televi-sion receiver Without any additional com-ponents,it divides by 64 In the absence ofan input signal,it operates in the highest frc-quencyrange Normally,theonlyexternalcom-ponents required are two small capacitors  \nThe SDA4211 offers two scaling factors:64or256,depending on the potential at pin5If that pin is at+5V,the input signal is di-vi by64;when the pin is at earth,scalingis by 256 On the PCB,—see Fig 4--this se-lection is facilitated by a3-way terminalstripand a jump link  \nFig.1.Measuring set-up of counter,prescaler and probe.  \nIhe two circuits are fully interchangeableas regards pinout and function,but not,ofcourse,in scaling factot  \n## Two paths\n\nIhe measured signal(frequencyfs)is splitinto twoimmediately after the input socket—see Fig 3 One part is fed to the prescalerproper(lower part of the diagram)via C4,while the othet is taken to a processing andamplifying section(upper part of the dia-giam)viaL₁  \nAnti-parallel connected diodes D₂and D₃limit the level of the input signal to not morethan±700 mV.Ihe signal is then applied topin 2 of IC₃.The symmetrical input of thisci t is connected asymmetrically,sincethe secondinput,pin3,is connected togroundvia C1 Jumpe","cbCaik3teTOtvMW2","https://ap.wps.com/l/cbCaik3teTOtvMW2","pdf",329386,"English","# 1.3 GHz Prescaler\n## Brief specification\n## Scaler ICs\n## Two paths\n## Construction\n## Parts list","[{\"question\":\"What frequency range does the 1.3 GHz prescaler support?\",\"answer\":\"The prescaler is designed to deliver a clean rectangular TTL-level signal at frequencies up to 1.3 GHz.\"},{\"question\":\"How is the input signal limited before processing?\",\"answer\":\"Anti-parallel connected diodes limit the input level to not more than ±700 mV before it is applied to IC3.\"},{\"question\":\"Which scaling ICs can be used and what do they do?\",\"answer\":\"The scaler IC can be either the Telefunken Type U664B (divides by 64) or the Siemens Type SDA4211 (divides by 64 or 256 depending on the potential at pin 5).\"}]","1.3 GHz Prescaler - Design | PDF",1791805039]