NASA/Goddard Space Flight Center, Code 211, Greenbelt, MD 20771

70 -- 2D ASYNCHRONOUS GAMMA RAY IMAGING ELECTRONICS SYSTEM SOL RFQ633-74899/994 POC Bill Bradley, Contracting Officer, 301-286-9474. The NASA/Goddard Space Flight Center (GSFC) plans to issue a Request For Quote (RFQ633-74899/994) on a sole source basis to Integrated Detector & Electronics as the acquisition will be for a two demensional, asynchronous gamma ray imaging electronics system. This acquisition is in support of the Laboratory for High Energy Astrophysics, Small Explorer Payload. The GSFC's experiment burst arc second imaging system (basis) requires a low energy gamma ray imaging electronics system. This system consists of a position senstive solid statement microstrip detector, analog electronics and appropriate digital acquisition and readout electronics. Sensor requirements: the sensor is an integral part of the system. It must be epoxied into a mounting fixture and wire bonded to a readout Application Specific Integrated Circuit (ASIC) designed specifically for asynchronous gamma ray imaging in addition, it must possess the following physical characteristics: position sensing, with a pitch of 50 microns, double sided (orthogonal positions from both sides), 256 strips per side, operating voltage below 70 volts, (3pf capacitance per strip (total), leakage current below .5 NA per strip. Electronics requirements: the electronics consists of severl parts, including an ASIC preamplifier chip, a digital control circuit and an interface to an ''IBM'' personal computer. Specific requirments: output must be asynchronous, i.e., no external trigger is required to acquire data from ASIC, trigger out signal provided, time delay of trigger out signal must be adjustable up to 10 uSEC, adjustable discriminator threshold from 0.25 - 1.0 Minimum Ionizing Particle (MIP) peaking time adjustable from 1 - 10 uSEC, noise level, ENC = 165 e + 6.1e/pF (or less) corresponding to ( 250 electrons for a 5 CM strip, rate capability up to 100 kHz, minimum of 11 bit digital output pulse height information, PC interface through optical data line for noise immunity, data out should be sparsified, i.e., hit channel and two neighboring channels must be read out, multiplicity information (i.e., number of hit channels) is required as part of the data out, hit channels must output a channel address, output voltage corresponding to 1 MIP should be )100mV, system must have the ability to mask off noisy/bad channels via software control, and an automatic chip reset should be provided, but with user adjustable time constant. All responsible sources may respond by submitting a written narrative statement of their capability, including detailed technical information and other technical literature, demonstrating their ability to meet the above requirements, within 15 days of the publication of this notice to the above address. The response shall be sufficient to permit agency analysis to establish a bonafide capability to meet these requirments. No collect calls or telephone requrest will be accepted. See Numbered Note(s): 22. (0170)

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