Jader Monari1 BEST receivers 4 th SKADS Workshop, Lisbon, 2-3 October 2008 Jader Monari IRA -INAF- Bologna –Italy-

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Presentation transcript:

Jader Monari1 BEST receivers 4 th SKADS Workshop, Lisbon, 2-3 October 2008 Jader Monari IRA -INAF- Bologna –Italy-

Jader Monari2 BEST receivers 4 th SKADS Workshop, Lisbon, 2-3 October The Best-2 platform is composed by 32 receivers 8 cylinders and offers about 1440 m 2 of collecting area. It is primarily aimed to test adaptive beamforming, calibration techniques, RFIs algorithms and develop / test some crucial technology.

Jader Monari3 BEST receivers 4 th SKADS Workshop, Lisbon, 2-3 October 2008 BEST-x GENERAL ARCHITECTURE

Jader Monari4 BEST receivers 4 th SKADS Workshop, Lisbon, 2-3 October 2008 OIP3>32dBmP1dB>16dBm NF<0.2dB Active device

Jader Monari5 BEST receivers 4 th SKADS Workshop, Lisbon, 2-3 October 2008 A1=A2 Hybrids good phase and amplitude match NF A1 =NF A2 reduction (NF = IL Input_Hybrid +NF A ) Balanced Architecture

Jader Monari6 BEST receivers 4 th SKADS Workshop, Lisbon, 2-3 October 2008 S21 S MHz S 21 (dB) NF (dB) T e (K) OIP3 (dBm)+34.5 P1dB out NF<0.5 between 380MHz and 450MHz OIP3 > + 34dBm between 350 e 450 MHz Balanced LNA, the prototype

Jader Monari7 BEST receivers 4 th SKADS Workshop, Lisbon, 2-3 October 2008 Full Front end chain

Jader Monari8 BEST receivers 4 th SKADS Workshop, Lisbon, 2-3 October 2008 Inside the FE RFin RFout NF=0.45dB Tn=32K Gain=60dB OIP3>+33dBm Input RL>15dB Output RL>15dB Power

Jader Monari9 BEST receivers 4 th SKADS Workshop, Lisbon, 2-3 October Comparision among several FEs

Jader Monari10 BEST receivers 4 th SKADS Workshop, Lisbon, 2-3 October 2008 Mechanical assembly of FE Discharges protection circuit 3 stages FE Opt. TX

Jader Monari11 BEST receivers 4 th SKADS Workshop, Lisbon, 2-3 October 2008 Federico’s Talk Federico’s Talk

Jader Monari12 BEST receivers 4 th SKADS Workshop, Lisbon, 2-3 October 2008 IF stages

Jader Monari13 BEST receivers 4 th SKADS Workshop, Lisbon, 2-3 October 2008 IF Receiver specifications IP3 spurs product -10dB lower than the system thermal noise (KTB)  IIP3 > -60dBm Auxiliary 408MHz out as monitor IF=30MHz, OL=378MHz Pin_ADC BW (ADC Berkeley) Pin KTB =-107dBm (Tb=20K) /-100dBm (Tb=500K)  G SYSTEM =70dB  G RX =35dB Digital controlled attenuator (31.5dB with 0.5dB step) for match the gain of the different receivers and to have the right dynamic range at the ADC section Only an MMIC model for all the receiver parts (1 RF, 1 OL and 4 IF)

Jader Monari14 BEST receivers 4 th SKADS Workshop, Lisbon, 2-3 October 2008 “Carrier” Board IF uP Power monitor (AD8362)  AD10dB Control of switch on-off each amplifier (diagnostic and power-safe via software)

Jader Monari15 BEST receivers 4 th SKADS Workshop, Lisbon, 2-3 October 2008 From the Optical link to the receiver Light

Jader Monari16 BEST receivers 4 th SKADS Workshop, Lisbon, 2-3 October 2008 Inside the IF receiver…. Signal paths: RF, IF, OL and digital control&monitor. To A/D

Jader Monari17 BEST receivers 4 th SKADS Workshop, Lisbon, 2-3 October 2008 Mechanical assembly Carrier-RXO

Jader Monari18 BEST receivers 4 th SKADS Workshop, Lisbon, 2-3 October ” To LAN 485 bus Two N-S Cylinders of Carrier-RXO

Jader Monari19 BEST receivers 4 th SKADS Workshop, Lisbon, 2-3 October 2008 Switch Ethernet 100BT 4X LO distributor 8X LO distributor 8X Receivers IBOB/ADC Power supplies IBOB/ADC BEE2 12X InfiniBand Switch Syntethizer for clock Clock Distributor PPS generator In the back 16X PPS distributor

Jader Monari20 BEST receivers 4 th SKADS Workshop, Lisbon, 2-3 October 2008

Jader Monari21 BEST receivers 4 th SKADS Workshop, Lisbon, 2-3 October 2008 Conclusions 1)Receivers, analogue optical links and data aquisition for BEST-2 are already installed and under test and programming 2)Future work will be to design and develop a new IF to sample directly the 408MHz 3) New mechanical chassis for next generation FE are going to use to simplify test and assembly 4) New digital uC is going to be used in order to monitor temperatures and eventually to control NGs or heaters/peltier to stabilize the FE environment