{"id":262,"date":"2022-08-22T23:35:15","date_gmt":"2022-08-22T15:35:15","guid":{"rendered":"https:\/\/www.ddzheng.cc\/?p=262"},"modified":"2022-08-22T23:35:15","modified_gmt":"2022-08-22T15:35:15","slug":"80db-noise-preamp","status":"publish","type":"post","link":"https:\/\/www.ddzheng.cc\/?p=262","title":{"rendered":"80dB Noise Preamp"},"content":{"rendered":"\n

Github: https:\/\/github.com\/ryanzheng97\/noise-amp<\/a><\/p>\n\n\n\n

A very high gain (80db or x10000) differential AC signal amplifier (LNA, pre-amplifier, noise amplifier, etc.) board based on EEVBlog community design.<\/p>\n\n\n\n

Original Post<\/a><\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Board is a 100x100mm 4-layer PCB which falls into the cheap sample tier at JLCPCB or PCBWay.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n

Specs<\/h1>\n\n\n
  • Gain: 80db nominal<\/li>
  • Bandwidth: <= 1MHz<\/li>
  • Power: +-18 to 35VDC, unregulated<\/li>
  • Connector: SMA for signal input and output, 2.54mm THT pads for power input.<\/li><\/ul>\n\n\n\n

    Test was done with a 1M to 100R resistor divider in front of the input. Signal was a single-ended sine wave, so one of the input is shorted to ground. Channel 3 shows original signal before resistor divider. Channel 1 shows amplified output.<\/p>\n\n\n\n

    Noise is about 20mVRMS on the output with input shorted to ground, so about 2uVRMS equivalent input noise.<\/p>\n\n\n\n

    \n
    \"\"<\/figure>\n<\/figure>\n\n\n

    Notes<\/h1>\n\n\n
    • Use high quality electrolytic capacitors<\/li>
    • Keep away from transformers and other magnetic interference<\/li>
    • You can replace op-amps with other models that you have or like<\/li>
    • Avoid ground loop when using<\/li>
    • Ground one input if using single-ended<\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"

      A very high gain (80db or x10000) differential AC signal amplifier<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[7,23,10],"class_list":["post-262","post","type-post","status-publish","format-standard","hentry","category-tech","tag-hw","tag-pcb","tag-writeup"],"_links":{"self":[{"href":"https:\/\/www.ddzheng.cc\/index.php?rest_route=\/wp\/v2\/posts\/262","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ddzheng.cc\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ddzheng.cc\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ddzheng.cc\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ddzheng.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=262"}],"version-history":[{"count":1,"href":"https:\/\/www.ddzheng.cc\/index.php?rest_route=\/wp\/v2\/posts\/262\/revisions"}],"predecessor-version":[{"id":267,"href":"https:\/\/www.ddzheng.cc\/index.php?rest_route=\/wp\/v2\/posts\/262\/revisions\/267"}],"wp:attachment":[{"href":"https:\/\/www.ddzheng.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=262"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ddzheng.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=262"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ddzheng.cc\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=262"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}