Osmo-bts-lna » History » Version 10
laforge, 07/25/2022 07:30 AM
gitea, webshop
| 1 | 4 | laforge | h1. osmo-bts-lna |
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| 2 | 1 | mschramm | |
| 3 | {{>toc}} |
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| 4 | |||
| 5 | 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. |
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| 6 | |||
| 7 | 2 | mschramm | The LNA features a 2-stage LNA formed by RF3865 (RFDM/Qorvo) and two EPCOS B3832 SAW. |
| 8 | 1 | mschramm | |
| 9 | The board consumes about 200mA @5V. It intregrates a MIC5219-5 LDO and should be supplied with 5.5-12V DC (7V nom.), either |
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| 10 | * by local connection (DC input), or |
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| 11 | * by 'phantom power' via DC biasing from the RF output. |
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| 12 | |||
| 13 | 7 | mschramm | The RF port can be used with U.FL/IPEX or SMA by moving a coupling capacitor. Bias sourcing is available via SMA. |
| 14 | 1 | mschramm | |
| 15 | 4 | laforge | h1. Schematics |
| 16 | |||
| 17 | 10 | laforge | The design files (including schematics + layout) are kept at https://gitea.osmocom.org/cellular-infrastructure/osmo-bts-amp |
| 18 | 5 | laforge | |
| 19 | 9 | laforge | Schema can be seen here, pdf rendering available as attachment:osmo-bts-lna_schematic.pdf, too. |
| 20 | 6 | laforge | |
| 21 | 1 | mschramm | !{width: 60%}osmo-bts-lna_schema.jpg! |
| 22 | 4 | laforge | |
| 23 | h1. Photos |
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| 24 | |||
| 25 | 1 | mschramm | !{width: 40%}bts-lna-top_mr.jpg! |
| 26 | !{width: 40%}bts-lna-top-2_mr.jpg! |
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| 27 | !{width: 40%}bts-lna-top-app_mr.jpg! |
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| 28 | !{width: 40%}bts-lna-bott_mr.jpg! |
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| 29 | 2 | mschramm | |
| 30 | |||
| 31 | 4 | laforge | h1. RF measurements |
| 32 | 2 | mschramm | |
| 33 | 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. |
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| 34 | |||
| 35 | |||
| 36 | *Osmo-BTS-LNA, -40dBm input*: |
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| 37 | |||
| 38 | !osmo-bts-lna_-40db-in.png! |
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| 39 | |||
| 40 | |||
| 41 | *Osmo-BTS-LNA, -70dBm input*: |
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| 42 | |||
| 43 | !osmo-bts-lna_-70db-in.png! |
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| 44 | |||
| 45 | |||
| 46 | *Osmo-BTS-LNA, -90dBm input*: |
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| 47 | |||
| 48 | !osmo-bts-lna_-90db-in.png! |
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| 49 | |||
| 50 | 1 | mschramm | |
| 51 | *Osmo-BTS-LNA, -110dBm input*: |
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| 52 | |||
| 53 | !osmo-bts-lna_-110db-in.png! |
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| 54 | 4 | laforge | |
| 55 | h1. Availability |
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| 56 | |||
| 57 | 10 | laforge | An 1800 MHz version of osmo-bts-lna can be obtained from https://shop.sysmocom.de/osmo-bts-lna-1800-MHz-band-uplink-LNA-kit/bts-lna-pcba-1800 |
| 58 | 4 | laforge | |
| 59 | Swapping the filters would permit to change this to other bands, as needed. |
