{"action":"closed","issue":{"url":"https://api.github.com/repos/m-labs/sinara/issues/30","repository_url":"https://api.github.com/repos/m-labs/sinara","labels_url":"https://api.github.com/repos/m-labs/sinara/issues/30/labels{/name}","comments_url":"https://api.github.com/repos/m-labs/sinara/issues/30/comments","events_url":"https://api.github.com/repos/m-labs/sinara/issues/30/events","html_url":"https://github.com/m-labs/sinara/issues/30","id":183161173,"number":30,"title":"analog mezzanine \"Curly\": baseband","user":{"login":"jbqubit","id":20543958,"avatar_url":"https://avatars.githubusercontent.com/u/20543958?v=3","gravatar_id":"","url":"https://api.github.com/users/jbqubit","html_url":"https://github.com/jbqubit","followers_url":"https://api.github.com/users/jbqubit/followers","following_url":"https://api.github.com/users/jbqubit/following{/other_user}","gists_url":"https://api.github.com/users/jbqubit/gists{/gist_id}","starred_url":"https://api.github.com/users/jbqubit/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jbqubit/subscriptions","organizations_url":"https://api.github.com/users/jbqubit/orgs","repos_url":"https://api.github.com/users/jbqubit/repos","events_url":"https://api.github.com/users/jbqubit/events{/privacy}","received_events_url":"https://api.github.com/users/jbqubit/received_events","type":"User","site_admin":false},"labels":[{"id":470809773,"url":"https://api.github.com/repos/m-labs/sinara/labels/analog%20mezzanine","name":"analog mezzanine","color":"bfdadc","default":false},{"id":470807020,"url":"https://api.github.com/repos/m-labs/sinara/labels/discussion","name":"discussion","color":"f9d0c4","default":false},{"id":451468917,"url":"https://api.github.com/repos/m-labs/sinara/labels/hardware","name":"hardware","color":"1d76db","default":false},{"id":455744953,"url":"https://api.github.com/repos/m-labs/sinara/labels/prio:1-normal","name":"prio:1-normal","color":"fbca04","default":false}],"state":"closed","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":15,"created_at":"2016-10-14T22:09:31Z","updated_at":"2016-10-28T15:51:54Z","closed_at":"2016-10-28T15:51:54Z","body":"Initial analog mezzanine focus is on applications involving output at baseband (no up/downconversion).  \r\n\r\n# output \r\n\r\n## high-level specification\r\n- 50 Ohm output, +13 dBm\r\n- bandwidth to 500 MHz for input and output\r\n  - low frequency cut-off 100 kHz?  \r\n- provides single-ended/differential conversion and band-defining/image rejection filtering as required\r\n- SMA shield capacitively coupled to ground on board, isolated from panel, to break ground loops\r\n\r\n## applications\r\n- driving 200 MHz AOM with +/-30 MHz bandwidth\r\n- driving 330 MHz AOM with +/-30 MHz bandwidth\r\n\r\n\r\n## component and design\r\nComponents in sequence, 4 parallel, identical channels -- DRAFT\r\n- capacitor, AC coupling \r\n- TC1-1-43X+ balun, differential to single-ended\r\n\r\n- MiniCircuits FV1206 filters\r\n- ERA-4XSM+ amplifier\r\n- filter block\r\n- capacitor, AC coupling\r\n- attenuator properties\r\n    - absorptive\r\n    - [ ] eg HMC542BLP6 or DAT-31R5A-SP+\r\n- capacitor, AC coupling\r\n- RF switch properties\r\n    - absorptive\r\n    - [ ] high speed -- how fast?\r\n    - [ ] eg JSW2-63DR+ or CSWA2-63DR+ #26\r\n- capacitors are ATC 600S101JT250XT 100pf \r\n    - 1.6M Ohm at 1kHz (1.6k at 1MHz) \r\n\r\n<img width=\"1016\" alt=\"mezzanine_analog_200mhz\" src=\"https://cloud.githubusercontent.com/assets/20543958/19402214/d3eadca8-922d-11e6-9516-32a806f6682f.png\">\r\n\r\n# input  \r\n\r\n## high-level specification\r\n- user-selectable switch for input termination\r\n    - 50 Ohm to ground \r\n    - 1MOhm/10 MOhm to ground\r\n- voltage input\r\n- range +/- 10 V\r\n- dc-coupled input\r\n- differential input (SMA pin/shield)\r\n    - input SMA barrel dc-isolated from ground  -- break ground loops\r\n    - user-configurable filter blocks\r\n\r\n\r\n## applications\r\n- +/-10 V, high-impedance input for photodiodes \r\n- analog input from fast photodiodes for feedback/feedforward/intensity servo, ~10 MHz bandwidth max?\r\n\r\n## component and design\r\n"}}
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