AMiBA PROJECT WEEKLY MEETING MINUTES

Date: 5/Octomber/2000

Attendants: K.Y. Lo, B. Martin, J. Peterson, W. Wilson , Bob Sault, M. Sinclair, M Kesteven, H. Wang + 1 student, T.H. Chu, H.C. Lu, M.T. Chen, R. Wei, H.S.Li, C.H. Lu, P. Shaw, J. Wang

Issues and Description	Action by	Output
MMIC- W- Band InP HEMT LNA
1. Regarding the Sub Hamonic Mixer¡¦s chip test at ATNF, Mal says that their lab is busy to test the InP for HBT amplifiers at this moment, but he think that test will be carried on before the end of this month. 2. Huei says that the first design for the InP HEMT MMIC is ready, and now is waiting for the wafer of JPL to see if they can do the second design. But definitely he will send one of the design to JPL by early Nov. Huei will contact Todd, and Fred will contact Charles Lawrence to find out the status about the NASA's approval. 3. As for the 0.1um GaAs HEMT, Huei says they will finish the layout touch up and send it to TRW by Oct. 20. 4. As to the export license application for the InP HEMT of TRW, Huei says Joyce told him that the review process is still ongoing at the State Department He is expecting to get a final decision on that issue by early November. 5. Waveguide filter ¡V Mal says he sent some experiment data to Huei, Huei will check the fax machine after going back to school. 6. As for purchasing the 4 units of 82~106 GHz amplifiers from NRAO, we sent a letter to NRAO for export license application. Once the internal purchasing procedure was completed we will release that order to NRAO. Paul says that the internal purchasing process is still ongoing, and in the mean time we are still waiting for NRAO¡¦s response about the export license approval. Fred will ask NRAO to provide the dimension of amplifier, it is important for Mingtang to design the receiver. 7. Mal says that their lab is ready to test the rest of 6 units of w-band InP LNA, that test result will be come out in two or three weeks. 8.Prof. Chu says he didn't receive the Specek's amplifiers yet, but it should be delivered by Oct. 20 according the notice of the local distributor.	H. Wang M. Sinclair H.Wang K.Y. Lo H.Wang H.Wang M.Sinclair H. Wang P. Shaw K.Y. Lo M. Sinclair T.H.Chu	ongoing ongoing ongoing ongoing ongoing ongoing ongoing ASAP ongoing ongoing
Lag Correlator Hybrid
1. Jeff says he did some simulation on the wire attenuator and alumina, he sent over some simulation data to Warwick by email a couple minutes ago. The next step is to see the noise of mixers, he is ordering a couple of amplifiers to fit in the two independent noise signals to mixers, and then to watch what the noise of the output, and what is the offset. And mean while he is working on making the 16 lag correlators. 2. Warwick says that he is still waiting for the HBT Gilbert Cell multiplier wafers from TRW. 3. Warwick says that he is thinking about how we might produce the lag correlators element, he is recently looking at the low temperature cold pile ceramic technology that is a possible way to do it. He found a company in Taiwan -¡§Advance Ceramic X Corp.¡¨ manufacturing these things. So it¡¦s will be a good idea to contact with them to see if they are possible to do it for us. Warwick will send the company¡¦s web address to Paul, and Paul will take care of it to find out the company, and contact with them. 4. As to the design work for prototype, Warick says it¡¦s coming together, he got one element going and the secondary one at this moment, he is calculating on that, and putting on the other, signaling them and see how they are going. 5. Ray Wei says he has simplified the circuit and also completed the simulation for the IC circuit. There are some problem about the frequency mismatch between master PLL and slave VCO, so is trying to solve these problems. After that he will start to design the digital part. 6. Huei says that they just finish the design work on the Gilbert Cells Multiplier, but it probably would not meet with the design goal, and right now they are proceeding the touch up stage, and it will be sent out in 2 or 3 weeks. In the mean time, he is studying the HBT design, because they have another run for the GaAs HEMT by late Dec. So he hopes to get some experience on the HBT design also. 7.Warwick says he has been talking to Prof. Chiueh about the packing process for prototype, he has a regular contact with Prof. Chiueh. He will forward the communication he have Prof. Chiueh to Paul. So Paul can keep on tracking these things.	J. Peterson W.Warwick P. Shaw W. Wilson R. Wei H. Wang P. Shaw	Ongoing ongoing next week ongoing ongoing ongoing ongoing
Receiver
1. Mingtang inputs a draft receiver layout on his web page, the signal entrance and the height of the main chamber is not decided yet. Leo is working on the component arrangement with him. As to the interface between receiver and mount, Bob will sent a platform layout drawing to Mingtang by next week. 2. Yugene says he only got a sheet of specs from the Atlantic Microwave Company about the OMT, they only guarantee the band width of 94~96 GHz. Bob suggests Yugene that he should talk to NRAO people about the OMT while he visiting there. Bob will follow up that as well.	M.T.Chen B. Martin Y.J. Hwang	ongoing next week ongoing
LO/IF
1.Bob says that Eugene is on the air plan right now, he is not here to report. Eugene got quite a lot of information of NRAO in Tucson at his visit. He sketch up some new concept for photonic LO, he will draw up and circulate around after he coming back. He also studies where to locate the noise rejection to the calibration source. Mal says they have the same problem there for w-band receiver, he had a little bit of look at the possibility of coupler, and he will take care of that issue. 2.Eugene should make formal proposal on the injection to the secondary, then we get together to discuss the present concept. As to the phase switching issue, Eugene also discussed it with John Payne in Tucson. It is a practical change to use a separate phase switch for each antenna, but this approach will lost one of the advantage of the photonic LO system. So we should discuss further with Eugene next week.	Y.J. Hwang Y.J.Hwang	ongoing next week
Platform/mount/dishes
1.Bob will send over a draft layout for mount and dishes to everyone in a week or two after. 2.Jeff don't think the caesarian could work with the 30cm antenna due to its high ground pick up. He will do some quantitative analysis to demonstrate this case. 3.Regarding the height of ground shield for our antenna, Bob requests Michael to ask their expert to verify what size are good for us.	B. Martin J. Peterson M.Kesteven	ASAP ASAP ongoing
Site acquisition
Bob says that he plans to visit Mauna Lao Observatory by the second week of November, to take a look on site and see what the possibility is and how we proceed.	B. Martine	Ongoing
Prototype Specification and Project Book
1. He got some contribution receiving drawings last day or two, we he will incorporate all of these into a revised draft, he will send it to Fred and Paul by the end of week. As a center source of all documentation there, and that is what has to be worked with others for further contribution on all chapters. Fred will take over the question with. 2. Bob and Fred asks Michael , Ravi and Bob to take a close look at some technical related science issues, e.g. UV coverage with current design on platform, drift scanning techniques, observation strategy and photonic delay line, etc. 3. Philippe's student generates some of layout drawings for dish, Paul will put them on web site for everyone to look at.	B. Martin M.Kesteven P. Shaw	Ongoing Ongoing ASAP
Travelling
Bob / Oct.9 ~ Oct. 26
Next Meeting
8:30pm EDT, 8:30am Taiwan, 10:30 Australia, 5:30pm Tucson/Thursday/ Oct. 12. 2000