FGIGN Centro Astronmico de Yebes CAY AMSTAR LowNoise

FG-IGN Centro Astronómico de Yebes CAY AMSTAR Low-Noise Wide-Band Cooled amplifiers with In. P Transistors Juan Daniel Gallego Puyol Francisco Colomer Isaac López Fernández Alberto Barcia 26/04/2004 Oxford 1

CAY FG-IGN Centro Astronómico de Yebes AMSTAR OUTLINE • • • Previous experience Technical details Deliverables Schedule Manpower 26/04/2004 Oxford 2

FG-IGN Centro Astronómico de Yebes CAY AMSTAR Experience in Cryogenic Amplifiers (1) • More than 150 cryogenic LNAs for different applications: – IRAM: Grenoble, Pd. B interferometer, 30 m (IF amplifiers) – HERSCHEL: • DMs for mixer groups (CALTECH, DEMIRM, IRAM, JPL, KOSMA, SRON) • DMs Delivered (QMs, FSs in ALCATEL) – – – – ALMA: Development of 4 -8 and 4 -12 GHz amplifiers CFA: Harvard, USA SMA ARECIBO, Puerto Rico BORDEAUX Observatory EMCOR (Atmospheric sensing) CAY: VLBI receivers (X and K band) ESOC: X-band for Deep Space Antennas 26/04/2004 Oxford 3

FG-IGN Centro Astronómico de Yebes CAY AMSTAR Experience in Cryogenic Amplifiers (2) • Wide experience with HEMT devices – More than 30 batches of commercial Ga. As transistors tested – Several models of In. P transistors measured • • 26/04/2004 JPL-TRW (CHOP program): 14 batches, 9 models ETH Zurich: 7 batches, 4 models HRL: 2 batches, 3 models Chalmers University: 1 batch Oxford 4

FG-IGN Centro Astronómico de Yebes 0. 19 mm CAY TRW T-42 CRYO 3 Ø 200× 0. 1 μm gate Ø Best performance AMSTAR Transistors 0. 22 mm TRW T-45 CRYO 4 Ø 200× 0. 1 μm gate Ø Used in DMs Ø Space qualified, to be used in HIFI Ø CHOP developed ETH T-35 Ø 200× 0. 2 μm gate Ø Experimental transistor Ø Design by request 26/04/2004 Oxford 5

CAY FG-IGN Centro Astronómico de Yebes Transistor area detail. AMSTAR ETH transistor with bonding wires See source inductive feedback and drain resistive loading MICROTECH DC connector Bias cavity with biasing circuits 1 Input matching circuit 26/04/2004 2 3 Interstage matching circuits Output matching circuit Oxford SMA connector 6

CAY FG-IGN Centro Astronómico de Yebes AMSTAR YCA 2000 (4 -8 GHz) 26/04/2004 Oxford 7

CAY FG-IGN Centro Astronómico de Yebes AMSTAR YCA 2000 (4 -8 GHz) 26/04/2004 Oxford 8

FG-IGN Centro Astronómico de Yebes CAY AMSTAR Deliverables • Amplifier for 2. 1. 1 80 -116 GHz 3 mm mixers (IRAM) – One unit – IF=4 -8 GHz, 3 stages – Due mid 2005 • Amplifier for 2. 1. 3 0. 5 mm mixer (SRON-Tu. D) – One unit – IF=4 -8 GHz, 3 stages – Due mid 2005 • Amplifier for 2. 4. 1 4 -pixel 3 mm test array (IRAM-RAL) – One unit ? (re-use of 2. 1. 1) 26/04/2004 Oxford 9

CAY FG-IGN Centro Astronómico de Yebes AMSTAR Schedule and Milestones 26/04/2004 Oxford 10

CAY FG-IGN Centro Astronómico de Yebes AMSTAR Manpower 26/04/2004 Oxford 11