Osmo-bts-lna » History » Revision 2
Revision 1 (mschramm, 06/20/2018 08:35 PM) → Revision 2/10 (mschramm, 06/20/2018 08:47 PM)
h1. misc hardware projects {{>toc}} h2. Osmo-BTS-LNA The Osmo-BTS-LNA is a low noise amplifier intended for DCS uplink reception (MS->BTS). This is DCS1800 for GSM and band 3 for both UMTS and LTE. The LNA features a 2-stage LNA formed by RF3865 (RFDM/Qorvo) and two EPCOS B3832 SAW. The board consumes about 200mA @5V. It intregrates a MIC5219-5 LDO and should be supplied with 5.5-12V DC (7V nom.), either * by local connection (DC input), or * by 'phantom power' via DC biasing from the RF output. The RF port can be used with U.FL/IPEX or SMA by moving a coupling capacitor. Bias sourcing is available via SMA. !{width: 40%}osmo-bts-lna_schema.jpg! !{width: 40%}bts-lna-top_mr.jpg! !{width: 40%}bts-lna-top-2_mr.jpg! !{width: 40%}bts-lna-top-app_mr.jpg! !{width: 40%}bts-lna-bott_mr.jpg! h3. RF measurements The Osmo-BTS-LNA has been tested on an Agilent E8356A. Some performance curves can be seen below. Input signal attnuation was -40, -70, -90 and -110 dBm. *Osmo-BTS-LNA, -40dBm input*: !osmo-bts-lna_-40db-in.png! *Osmo-BTS-LNA, -70dBm input*: !osmo-bts-lna_-70db-in.png! *Osmo-BTS-LNA, -90dBm input*: !osmo-bts-lna_-90db-in.png! *Osmo-BTS-LNA, -110dBm input*: !osmo-bts-lna_-110db-in.png!