Osmo-bts-lna » History » Version 2
mschramm, 06/20/2018 08:47 PM
adding VNA measurements
| 1 | 1 | mschramm | h1. misc hardware projects |
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| 2 | |||
| 3 | {{>toc}} |
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| 4 | |||
| 5 | h2. Osmo-BTS-LNA |
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| 6 | |||
| 7 | 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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| 9 | 2 | mschramm | The LNA features a 2-stage LNA formed by RF3865 (RFDM/Qorvo) and two EPCOS B3832 SAW. |
| 10 | 1 | mschramm | |
| 11 | 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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| 12 | * by local connection (DC input), or |
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| 13 | * by 'phantom power' via DC biasing from the RF output. |
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| 14 | |||
| 15 | 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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| 17 | !{width: 40%}osmo-bts-lna_schema.jpg! |
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| 18 | !{width: 40%}bts-lna-top_mr.jpg! |
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| 19 | !{width: 40%}bts-lna-top-2_mr.jpg! |
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| 20 | !{width: 40%}bts-lna-top-app_mr.jpg! |
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| 21 | !{width: 40%}bts-lna-bott_mr.jpg! |
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| 22 | 2 | mschramm | |
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| 24 | h3. RF measurements |
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| 26 | 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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| 28 | |||
| 29 | *Osmo-BTS-LNA, -40dBm input*: |
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| 30 | |||
| 31 | !osmo-bts-lna_-40db-in.png! |
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| 32 | |||
| 33 | |||
| 34 | *Osmo-BTS-LNA, -70dBm input*: |
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| 35 | |||
| 36 | !osmo-bts-lna_-70db-in.png! |
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| 37 | |||
| 38 | |||
| 39 | *Osmo-BTS-LNA, -90dBm input*: |
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| 40 | |||
| 41 | !osmo-bts-lna_-90db-in.png! |
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| 42 | |||
| 43 | |||
| 44 | *Osmo-BTS-LNA, -110dBm input*: |
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| 45 | |||
| 46 | !osmo-bts-lna_-110db-in.png! |
