Jader Monari [email protected]

IRA -INAF Bologna –Italy-

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

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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.

1 2 8 4 th SKADS Workshop, Lisbon, 2-3 October 2008 BEST receivers Jader Monari

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

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Active device

OIP3>32dBm P1dB>16dBm NF<0.2dB

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

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Balanced Architecture

• A1=A2 • Hybrids good phase and amplitude match • NF A1 =NF A2 reduction

(NF = IL

Input_Hybrid

+NF

A

)

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

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40 20 0 -20 -40 -60 50 S 21 (dB) NF (dB) T e (K) OIP3 (dBm) P1dB out

S21

Balanced LNA, the prototype

0 -10

S22

-20 -30 550 Frequency (MHz) -40 1050 Sim @ 408 MHz 24 0.22

-50 50

4 th SKADS Workshop, Lisbon, 2-3 October 2008

+21.2

BEST receivers

550 Frequency (MHz) Meas @ 408 MHz 24.4

0.45

31.5

+34.5

+21.2

Jader Monari

1050 6

Full Front end chain

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

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Inside the FE

RFout RFin NF=0.45dB Tn=32K Gain=60dB BW=16MHz@408MHz OIP3>+33dBm Input RL>15dB Output RL>15dB Power Supply=10-15Volt@=245mA

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

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Comparision among several FEs

59 -40 58 57 -50 56 64 -10 63 62 -20 61

4 th SKADS Workshop, Lisbon, 2-3 October 2008

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BEST receivers Jader Monari

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Mechanical assembly of FE

3 stages FE Discharges protection circuit Opt. TX

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

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

Federico’s Talk

Jader Monari

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

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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 =-35/-30dBm @16MHz (ADC Berkeley)

•

Pin KTB =-107dBm (Tb=20K) /-100dBm (Tb=500K)



G RX =35dB G SYSTEM =70dB

 •

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

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IF

“Carrier” Board

uP •

Power monitor (AD8362)



AD10dB

•

Control of switch on-off each amplifier (diagnostic and power-safe via software) 4 th SKADS Workshop, Lisbon, 2-3 October 2008 BEST receivers Jader Monari

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From the Optical link to the receiver

Light

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

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Inside the IF receiver….

To A/D Signal paths: RF, IF, OL and digital control&monitor.

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

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Mechanical assembly Carrier-RXO

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

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Two N-S Cylinders of Carrier-RXO

485 bus 19”

4 th SKADS Workshop, Lisbon, 2-3 October 2008

To LAN

BEST receivers Jader Monari

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8X Receivers 8X LO distributor 8X Receivers 8X LO distributor 8X Receivers 8X LO distributor 8X Receivers 8X LO distributor 4X LO distributor Switch Ethernet 100BT Syntethizer for clock PPS generator Clock Distributor In the back 16X PPS distributor IBOB/ADC 12X InfiniBand Switch BEE2 IBOB/ADC Power supplies

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

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

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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

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

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