High Speed Digitisers for RadioAstronomy High Speed Digitisers for RadioAstronomy using InP HBTs using InP HBTs Paul Roberts
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High Speed Digitisers for RadioAstronomy High Speed Digitisers for RadioAstronomy using InP HBTs using InP HBTs Paul Roberts

Paul Roberts CSIRO Australia Telescope National Facility CSIRO Australia Telescope National Facility PaulRoberts PaulRoberts atnf atnf csiro csiro au au 200 180 160 140 120 100 80 60 10000 20000 30000 40000 50000 60000 Voltage mV10 time psec Digitis

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High Speed Digitisers for RadioAstronomy High Speed Digitisers for RadioAstronomy using InP HBTs using InP HBTs Paul Roberts




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Presentation on theme: "High Speed Digitisers for RadioAstronomy High Speed Digitisers for RadioAstronomy using InP HBTs using InP HBTs Paul Roberts"— Presentation transcript:


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High Speed Digitisers for Radio-Astronomy High Speed Digitisers for Radio-Astronomy using InP HBTs using InP HBTs Paul Roberts. Paul Roberts. CSIRO, Australia Telescope National Facility. CSIRO, Australia Telescope National Facility. Paul.Roberts@ Paul.Roberts@ atnf atnf csiro csiro .au .au -200 -180 -160 -140 -120 -100 -80 -60 10000 20000 30000 40000 50000 60000 Voltage (mV/10) time (psec) Digitiser/Demultiplexer Beat Frequency Test (Clk1 = 10 GHz, Clk2 = 2.5 GHz, fin = 9.96 GHz) Operation up to 8 Giga-Samples/s Fully differential ECL/CML topology On chip matching of RF and

clock inputs 1 - 4 demultiplexers on chip Outputs designed to drive 50 ohm terminated lines at ECL levels Common mode range 0 - -1.3V Input level -6 dBm Uses mostly smallest 1.5 x 2 um transistors 740 transistors, 315 resistors, 3 capacitors - 3.2mm x 2.2mm Dissipates 1.6W with a 3.5 V supply Digitiser with Demultiplexer Operation up to 8 Giga-Samples/ Contains no demux 119 transistors, 57 resistors and 3 capacitors 350 mW on a 1.6mm x 1.2mm die Sampling clock supplied photonically Digital data returned photonically On chip photodiode and transimpedance amplifier Current switching output

drivers for driving external laser diodes or MZMs 116 transistors, 59 resistors and 3 capacitors 700 mW on a 1.6mm x 1.2mm die Digitiser Indium Phosphide Heterojunction Bipolar Transistor (InP HBT) technology offers transistors with an intrinsic cutoff frequency of 70 GHz combined with good across-chip device matching and modest levels of integration. This combination of properties makes them well suited for realising medium complexity circuits such as high speed digitisers . The ATNF has successfully designed and tested a range of three-level quantisation digitiser integrated circuits using

InP HBTs. On wafer testing showed correct large signal operation of the devices to at least 10 GHz clock rate. Our current correlator allows us to use the devices in-system to a maximum clock rate of 4 GHz. Photonic I/O Digitiser Complete 4 GS/s Digitiser 2 GHz Spectrum 2048 Channels Digitiser Package