Jader Monari 1BEST receivers4th SKADS Workshop, Lisbon, 2-3 October 2008

Jader Monarij.monari@ira.inaf.it

IRA -INAF-Bologna –Italy-

Jader Monari 2BEST receivers4th SKADS Workshop, Lisbon, 2-3 October 2008

1 2

8

The Best-2 platform is composed by 32 receivers 8 cylinders and offers about 1440 m2 of collecting area.

It is primarily aimed to test adaptive beamforming, calibration techniques, RFIs algorithms and develop / test some crucial

technology.

Jader Monari 3BEST receivers4th SKADS Workshop, Lisbon, 2-3 October 2008

BEST-xGENERAL ARCHITECTURE

Jader Monari 4BEST receivers4th SKADS Workshop, Lisbon, 2-3 October 2008

OIP3>32dBm P1dB>16dBm

NF<0.2dB

Active device

Jader Monari 5BEST receivers4th SKADS Workshop, Lisbon, 2-3 October 2008

• A1=A2

• Hybrids good phase and amplitude match

• NFA1=NFA2 reduction

(NF = ILInput_Hybrid+NFA)

Balanced ArchitectureBalanced Architecture

Jader Monari 6BEST receivers4th SKADS Workshop, Lisbon, 2-3 October 2008

50 550 1050

Frequency (MHz)

-50

-40

-30

-20

-10

0

dB

50 550 1050

Frequency (MHz)

-60

-40

-20

0

20

40

dB

S21

S22

Sim @ 408 MHz Meas @ 408 MHz

S21 (dB) 24 24.4

NF (dB) 0.22 0.45

Te (K) 15 31.5

OIP3 (dBm) +34.5 +34.5

P1dBout +21.2 +21.2

NF<0.5 between 380MHz and 450MHz

OIP3 > + 34dBm between 350 e 450 MHz

Balanced LNA, the prototype

Jader Monari 7BEST receivers4th SKADS Workshop, Lisbon, 2-3 October 2008

Full Front end chain

Jader Monari 8BEST receivers4th SKADS Workshop, Lisbon, 2-3 October 2008

Inside the FEInside the FE

RFinRFout

NF=0.45dB Tn=32K Gain=60dB BW=16MHz@408MHz OIP3>+33dBm

Input RL>15dB Output RL>15dB Power Supply=10-15Volt@=245mA

Jader Monari 9BEST receivers4th SKADS Workshop, Lisbon, 2-3 October 20089

-60

-50

-40

-30

-20

-10

0

396 400 404 408 412 416 420

Frequency [MHz]

|S11

| [d

B]

FE#10 FE#21 FE#22 FE#23 FE#24 FE#25 FE#26 FE#27 FE#28 FE#29 FE#30

55

56

57

58

59

60

61

62

63

64

65

396 400 404 408 412 416 420

Frequency [MHz]

|S21

| [d

B]

FE#10 FE#21 FE#22 FE#23 FE#24 FE#25 FE#26 FE#27 FE#28 FE#29 FE#30

Comparision among several FEsComparision among several FEs

Jader Monari 10BEST receivers4th SKADS Workshop, Lisbon, 2-3 October 2008

Mechanical assembly of FEMechanical assembly of FE

Discharges protection circuit

3 stages FE

Opt. TX

Jader Monari 11BEST receivers4th SKADS Workshop, Lisbon, 2-3 October 2008

Federico’s TalkFederico’s Talk

Jader Monari 12BEST receivers4th SKADS Workshop, Lisbon, 2-3 October 2008

IF stages

Jader Monari 13BEST receivers4th SKADS Workshop, Lisbon, 2-3 October 2008

IF Receiver specificationsIF 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_ADCBW=-35/-30dBm @16MHz (ADC Berkeley)

• PinKTB=-107dBm (Tb=20K) /-100dBm (Tb=500K) GSYSTEM=70dB GRX=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 Monari 14BEST receivers4th SKADS Workshop, Lisbon, 2-3 October 2008

““CarrierCarrier” Board” Board

IF uP

• Power monitor (AD8362) AD10dB

• Control of switch on-off each amplifier (diagnostic and power-safe via software)

Jader Monari 15BEST receivers4th SKADS Workshop, Lisbon, 2-3 October 2008

From the Optical link to the receiverFrom the Optical link to the receiver

Light

Jader Monari 16BEST receivers4th SKADS Workshop, Lisbon, 2-3 October 2008

Inside the IF receiver….Inside the IF receiver….

Signal paths: RF, IF, OL and digital control&monitor.

To A/D

Jader Monari 17BEST receivers4th SKADS Workshop, Lisbon, 2-3 October 2008

Mechanical assembly Mechanical assembly CarrierCarrier-RXO-RXO

Jader Monari 18BEST receivers4th SKADS Workshop, Lisbon, 2-3 October 2008

19”

To LAN

485 bus

Two N-S Cylinders of Two N-S Cylinders of CarrierCarrier-RXO-RXO

Jader Monari 19BEST receivers4th SKADS Workshop, Lisbon, 2-3 October 2008

Switch Ethernet 100BT

4X LO distributor

8X LO distributor

8X LO distributor

8X LO distributor

8X LO distributor

8X Receivers

8X Receivers

8X Receivers

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 Monari 20BEST receivers4th SKADS Workshop, Lisbon, 2-3 October 2008

Jader Monari 21BEST receivers4th SKADS Workshop, Lisbon, 2-3 October 2008

ConclusionsConclusions

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