AMiBA PROJECT WEEKLY MEETING MINUTES

Date: 7 December 2000

Participants: B. Martin, M. Kesteven, M.T. Cheng, Y. J. Hwang, R. Wei, J. Li, P. Shaw, Jean Cheng

Issues and Description	Action by			Output
MMIC- W- Band InP HEMT LNA
1. Huei, T.H. & Leo will visit Sydney, and participate the APM Conference from Dec.3 through Dec.8. Huei will bring the Sub Hamonic Mixer chip of 0.15£gm GaAs PHEMT with him while he visit Sydney. He will organize a meeting with Mal in advance, so he can hand over that chip to ATNF people; rather Russell or Mal, and discuss relevant design and measurement issues with them. The target date to finish all measurements on those chips by late Dec, which including the chip already in ATNF. 2. Todd told Huei that the delivery for InP HEMT chip would be delay for two weeks. Huei thinks they may have time to make another design, his student in working on this. Huei will check this with Todd before leaving for Sydney. 3. As for the 0.1um GaAs HEMT, Huei says that they received some errors back, and now they are fixing on that. 4.¡K.As to the export license application for the InP HEMT of TRW, Fred wrote a letter to AIT confirming we will not retransfer those InP HEMT MMIC wafers without the consent of the U.S. government. 5. Regarding the Wave-guide filter, George Grace will finish a drawing and send to Huei today, Mal says. 6. Leo will prepare a specification for HPF, in the mean time he will make a simulation on that design. The target date to present that simulation result to everyone by Dec. 14. 7. Regarding the InP MMIC, Mal says that 3 w-band amplifiers has been tested, and the result is quite encourage. Huei would like to read the testing data, and discuss with Mal or Russell in details, and even to take a look at the chip packaging in the fixture. Mal and Huei will organize a meeting in Sydney by email later on. 8. Regarding the Specek's amplifiers, the local agent confirmed the delivery is on Dec. 8, Leo says. 9. Michael says that Huei, T. D. & Leo came over AT in yesterday morning.	H. Wang M. Sinclair H.Wang H.Wang M. Sinclair H.C. LU M. Sinclair W. Wang T.H. Chu			ongoing ongoing. ongoing ongoing Dec.14 ASAP ongoing
Lag Correlator Hybrid
1. Regarding the InP HBT multipliers, Warwick says that there are two wafers will be sent back from TRW tomorrow, and hopefully he could receive the wafers around the Christmas time. So after that they will start packaging, and doing more testing on it 2. Ray says that he just finish the chip design, and send it to CIC this Monday, so he expects to receive the chip back by Feb.19. And he hopes that chip is able to work on 5 volts, since the original design of the 3.5 micron CMOS is working on 3.3 volts. 3. Ray asks if he need to design a new LNA/LPF chip? Warwick will discuss this issue further with Tzi-Dar.	W. Wilson Ray Wei W. Warwick			ongoing Ongoing ASAP
Receiver
1. Regarding the collaboration proposal on the development of NRAO OMT, John is working on pricing and time schedule in details. Bob will follow up this issue with John. 2. Mingtang says that he would like to know how Mal progress on phase shifter design; he will talk with Mal about. 3. Regarding the interface between feed horn and second mirror, Bob says that the feed horn goes up to the dish be the reference diameter for the optical dish and feed horn. Then he can figure out a way to machine precisely or to fit precisely the dish around that for registration and for alignment. In the other hand, he can figure out a way to tight the feed horn to this structure, then we eliminate the lighten problem later, that¡¦s the direction he is working on.	B. Martin M.T. Chen		ASAP
LO/IF
1. Bob have had Eugene take look at the LO and investigate the pricing if we did a conventional LO instead. He have also had Eugene regroup the pricing to separate the LO from the phonotic calibration scheme. Some conclusions are: 1) The conventional LO and photonic LO will be about the same price; 2) Part of the price difference is the fact we never included the calibration scheme in the original estimates. This is about 4M NTD of the total; 3) The original estimate of pricing was very low and poorly done; 4) It make more since to still do the photonic LO since we really need to do the calibration scheme as a photonic system. A conventional calibration scheme will not have the broadband noise source capability, only narrow band. The new estimate is a little lower than the last estimate and Eugene is looking at other ways to save our cost. 2. Yugene says that he just finish a report on the price comparison between photonic LO and conventional LO, so he will email it to everyone to look.		Y.J. Hwang Y. J.Hwang		ASAP After meeting
Platform/Mount/Dishes
1. Bob says that he got a quote back from Vertex this morning. The good news it that it looks a very professional document, which including 4 pages piece breakdown and 13 pages of specification, the bad news is the price, it is twice as much as we can afford. The real hard problem is the loading of the platform and wing blow loading, and Vertex need to redesign these jag screw, they can¡¦t use the actuators and jag screw which they have already. He think this is the main drive for such high price of Vertex, he will study this quote in detail and think about come back to them trying to negotiate with different approach, and try to understand what the cost are. He will forward Vertex quote to Michael to take a look as well. 2. Bob will get a quote for dishes from the firm in Tucson calls ¡§Compositive Mirrors Applications¡¨. They actually did the dish for SMT, and also did the secondary mirror for CBI. The price is around $1,000USD per square meter. 3. Positive Mirrors will give a quote for platform by next week as well, Bob says. 4. Bob asks Michael to take look on the approach to the whole system in terms of number of elements, and the certain way of approach or concept what we are going to do, there is the modularity issue of the correlator and how we are doing the platform and dish, to figure our the optimal number for all of key elements. He also would like ask Warwick to take a look at how strong is the couple, if we cut the cost in the project, and how strong they got the of correlator cost projection going with the end square, and how much is the consequence, how many % in size. Bob really like to draw out some conclusion about where we should go with how many elements, and how we should approach this in budgetary term. In the mean time, Paul will update the cost projection on what we have, and send it over to Warwick and Michael to look at.		B. Martin B. Martin B. Martin M. Kesteven W. Warwick. P. Shaw		ongoing Ongoing Ongoing ASAP
Next Meeting
7:30pm EDT, 8:30am Taiwan, 10:30 Australia, 4:30pm Tucson/Thursday/Dec.14, 2000