Osmo-bts-lna » History » Version 5
laforge, 10/07/2018 06:41 AM
| 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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| 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 | The RF port can be used with U.FL/IPEX or SMA by moving a coupling capacitor. Bias sourcing is available via SMA. |
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| 15 | 4 | laforge | h1. Schematics |
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| 17 | 5 | laforge | The design files (including schematics + layout) are kept at FIXME |
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| 19 | 1 | mschramm | !{width: 60%}osmo-bts-lna_schema.jpg! |
| 20 | 4 | laforge | |
| 21 | h1. Photos |
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| 23 | 1 | mschramm | !{width: 40%}bts-lna-top_mr.jpg! |
| 24 | !{width: 40%}bts-lna-top-2_mr.jpg! |
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| 25 | !{width: 40%}bts-lna-top-app_mr.jpg! |
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| 26 | !{width: 40%}bts-lna-bott_mr.jpg! |
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| 27 | 2 | mschramm | |
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| 29 | 4 | laforge | h1. RF measurements |
| 30 | 2 | mschramm | |
| 31 | 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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| 33 | |||
| 34 | *Osmo-BTS-LNA, -40dBm input*: |
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| 35 | |||
| 36 | !osmo-bts-lna_-40db-in.png! |
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| 37 | |||
| 38 | |||
| 39 | *Osmo-BTS-LNA, -70dBm input*: |
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| 40 | |||
| 41 | !osmo-bts-lna_-70db-in.png! |
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| 42 | |||
| 43 | |||
| 44 | *Osmo-BTS-LNA, -90dBm input*: |
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| 45 | |||
| 46 | !osmo-bts-lna_-90db-in.png! |
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| 47 | |||
| 48 | 1 | mschramm | |
| 49 | *Osmo-BTS-LNA, -110dBm input*: |
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| 50 | |||
| 51 | !osmo-bts-lna_-110db-in.png! |
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| 52 | 4 | laforge | |
| 53 | h1. Availability |
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| 55 | An 1800 MHz version of osmo-bts-lna can be obtained from http://shop.sysmocom.de/products/osmo-bts-lna-1800 |
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| 56 | |||
| 57 | Swapping the filters would permit to change this to other bands, as needed. |
