feed & front end pdrbob hayward receiver engineer feed & front end pdr 12-13 feb 2002 1 feed...
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Bob HaywardReceiver Engineer
Feed & Front End PDR12-13 Feb 2002
1
Feed & Front End PDR
Monitor & Controland
Cryogenics
Bob HaywardReceiver Engineer
Feed & Front End PDR12-13 Feb 2002
2
The “Card Cage” (Photograph)
Bob HaywardReceiver Engineer
Feed & Front End PDR12-13 Feb 2002
3
The “Card Cage”
• Originated with X-band Receiver in 1980’s• Different for each Receiver Band• Hand-Wired
• Labor Intensive & Mistake Prone
• Many components now obsolete or hard to get• Mixes high voltage (150 VAC) & low-level
signals (ie: LNA bias)
Bob HaywardReceiver Engineer
Feed & Front End PDR12-13 Feb 2002
4
Old M&C(for L, X, K & Q)
Rx#1
CardCage
Rx#2
CardCage
F14Module
Data SetModule
Rx#3
CardCage
Bob HaywardReceiver Engineer
Feed & Front End PDR12-13 Feb 2002
5
Current Monitor Points (L, X, K & Q-Band)
• Monitor Points:• LNA VGate (RF1/2 & LF1/2) & LED Voltage• Dewar Temperature (300, 50, 15�K Stages)• Vacuum Pressure (Dewar & Pump Line)• Cryo Status (Off, Cool, Stress, Heat, Pump)• Pump & Solenoid Valve Status • AC Current• Rx Band ID, S/N & Mod Level (4+6+2 bits)
Bob HaywardReceiver Engineer
Feed & Front End PDR12-13 Feb 2002
6
Current Control Points (L, X, K & Q-Band)
• Control Points:• Cryo Status (Off, Cool, Stress, Heat, Pump) • Control LNA Bias Settings (with potentiometers)
• Signals that pass thru the Card Cage:• Lo-Cal Drive (TCAL)• Hi-Cal Drive (SCAL)
Bob HaywardReceiver Engineer
Feed & Front End PDR12-13 Feb 2002
7
Current “Local” M&CFunctions
• Monitor Dewar Temperatures & Vacuum• Control Refrigerator and Vacuum Pump
• based on monitored parameter
• Control LNA Bias Settings • Communicate with Rest of World
• For VLA, used F14 Module• For EVLA, via the MIB
Bob HaywardReceiver Engineer
Feed & Front End PDR12-13 Feb 2002
8
New M&C Guidelines
• Minimize Digital “Traffic”• Fail-Safe Design• Replace Obsolete Components• Minimize Space Required• Standardize Components & Systems
Bob HaywardReceiver Engineer
Feed & Front End PDR12-13 Feb 2002
9
Cryogenic and Vacuum Control
• Operating Sequence Controlled “Locally”– “Fail-Safe” if Computer is “Down”
• Refrigerator will not start without vacuum in Dewar
• Current Design Works Well – Don’t change the basic logic– But do it in new hardware
Bob HaywardReceiver Engineer
Feed & Front End PDR12-13 Feb 2002
10
“Stress” Mode and AC Current Monitor
• VLA has the capability to– Add “stress” heat load to refrigerator– Monitor total current to refrigerator and vacuum solenoids
• This was meant for remote diagnosis, but is not used– Cryo performance trends monitored instead
• This capability not needed for EVLA
Bob HaywardReceiver Engineer
Feed & Front End PDR12-13 Feb 2002
11
Amplifier Biasing
• “Servoed” Bias Circuit – Maintains ID Constant by Varying VG
– Uses 8 pots to control 4 stages per card– Provides Buffered Monitor Voltages– Provides Over-voltage and ESD Protection
• Current Design Works Well – Don’t change the basic circuit design– But do it in new hardware
Bob HaywardReceiver Engineer
Feed & Front End PDR12-13 Feb 2002
12
EVLA Receiver M&C Options
1) A dedicated Card Cage for each receiver• “Old” Philosophy• Need 240 units + spare cards
2) Single M&C Rack Unit for all 8+ Rx’s / antenna• “New” Philosophy• Total of 30 units + spare cards
• Surely easier and cheaper to build 30 rack units than build/modify 240 Card Cages
Bob HaywardReceiver Engineer
Feed & Front End PDR12-13 Feb 2002
13
New M&CBlock Diagram
LBC Q-Rx
Temp SensorCard(s)
Vacuum SensorCard(s)
Pump ControlCard(s)
LNA SerialCard(s)
Inte
rfac
e
Mic
roco
mpu
ter
AD
C /
PIO
/ SI
O /
Ethe
rnet LBC Ka-Rx
LBC K-RxLBC Ku-RxLBC X-RxLBC C-RxLBC S-RxLBC L-Rx
Bob HaywardReceiver Engineer
Feed & Front End PDR12-13 Feb 2002
14
Multi-Receiver M&C Unit
• Common Temp & Vacuum Monitoring• 4-wire DT-471 Temp Sensors good for cables many
feet in length• Need to investigate maximum cable length Hasting
DV-6 pressure sensors can handle (10-500 mV)
• Remote Fridge & Pump Control • Avoids 150 V / 60 Hz near sensitive LNA bias lines
Bob HaywardReceiver Engineer
Feed & Front End PDR12-13 Feb 2002
15
M&C Computer
• Embedded Control Computer• How smart does the Rx �C need to be?• MIB or dedicated Front End Subsystem ?• Engineering M&C and Diagnostic Software• Since no “Local” access, need identical units for
Lab testing
Bob HaywardReceiver Engineer
Feed & Front End PDR12-13 Feb 2002
16
New M&C CardsFunctions
• New Temperature Sensor Cards:• Cryo Temps : 2 per Rx times 8 = 16 (+spares)• Room Temps : 1 per Rx times 8 = 8 (+spares)
• New Vacuum Sensor Cards:• 2 per Rx times 8 = 16 (+spares)
• New Control Card:• Pump / Fridge sequencing and Heater On/Off control
for each Receiver (ie: 8+)
Bob HaywardReceiver Engineer
Feed & Front End PDR12-13 Feb 2002
17
New Amplifier Bias Cards
• Can be much smaller than old design• Possibly mount inside Dewar• Bias lines shorter, shielded by Dewar• Fewer pins in Dewar feedthru connector
(typically 9 lines required for a 4-stage LNA)• Cheaper• Better seal• Better RFI bypassing
Bob HaywardReceiver Engineer
Feed & Front End PDR12-13 Feb 2002
18
New LNA Bias Card
• LNA Bias Card (LBC):• Minimum of 4 stages x 2 Polarizations = 8 stages• Sync Serial Interface to Rx M&C Unit• Programmable Drain Voltage and Current settings• Monitor all VDrain and IDrain settings plus VGate• Use NRAO-Tucson has a Quad LNA (16-stage) card ?
(8-layer board, 800 cpts, 32 channel DACSCLK, SYNC, DIN + VD/ID/VG-Mon)
• Non-volatile Bias Settings ?(or controlled by a “remote” PIC micro like Quad LNA)
Bob HaywardReceiver Engineer
Feed & Front End PDR12-13 Feb 2002
19
NRAO-TucsonALMA Quad LNA Bias
Card Block Diagram
LNA2_VG_MON[1..5]
LNA2_D5
LNA4_G3
IDS_MON
LNA2_G3
LNA2_VD_SET[1..5]
U1
SN74HC594DW
14
11
10
12
13
151234567
9
SER
SRCLK
SRCLR
RCLK
RCLR
QAQBQCQDQEQFQGQH
QH'
MON_A[0..3]
D1MMSZ5240BS
VCC
SYNC2
LNA1_G3
MON_A3
LNA3_VG_MON[1..3]
MON_A0
DIN
VSS
VCC
AVCC
DIN
LNA1_D5
10.0V
LNA1_D2
R43.92K
LNA3_G2
LNA4_D2
R1
752-091-100K
1 2
34
56
789
LNA4
3-Stage_HEMT_LNA_Bias
ID_MON[1..3]DRAIN[1..3]
GATE[1..3]
VD_SET[1..3]
ID_SET[1..3]REF
VD_MON[1..3]
VG_MON[1..3]
ENAB
LNA3_ID_SET[1..3]
LNA1_G1
U2
MAX8216CSD
1
9
10111213
7
56
14
34
VREF
DOUT
OUT4OUT3OUT2OUT1
DIN
+15V-15V
VDD
+5V-5V
LNA1_ID_MON[1..5]
VGS_MON
LNA3_D1
LNA3_VD_MON[1..3]
LNA2_ID_SET[1..5]LNA1_G5
MON_A1
LNA2_G5
LNA3
3-Stage_HEMT_LNA_Bias
ID_MON[1..3]DRAIN[1..3]
GATE[1..3]
VD_SET[1..3]
ID_SET[1..3]REF
VD_MON[1..3]
VG_MON[1..3]
ENAB
LNA4_G1
LNA1_D1
VDS_MON
ENAB_LNA4
LNA4_D3
LNA2_G2
LNA3_D[1..3]
LNA4_ID_MON[1..3]
R2
1K
LNA3_D2LNA3_G1
MON_A2
VDS_MON
ENAB_LNA3
LNA1_G2
LNA2_D[1..5]
SCLK
LNA2
5-Stage_HEMT_LNA_Bias
ID_MON[1..5]DRAIN[1..5]
GATE[1..5]
VD_SET[1..5]
ID_SET[1..5]REF
VD_MON[1..5]
VG_MON[1..5]
ENAB
LNA2_G[1..5]
LNA2_G1
LNA1
5-Stage_HEMT_LNA_Bias
ID_MON[1..5]DRAIN[1..5]
GATE[1..5]
VD_SET[1..5]
ID_SET[1..5]REF
VD_MON[1..5]
VG_MON[1..5]
ENAB
LNA2_VD_MON[1..5]
LNA1_VG_MON[1..5]
IDS_MON
VSSVDD
LNA1_VD_SET[1..5]
LNA3_G[1..3]
LNA1_D[1..5]
LNA1_G4
ENAB_LNA2
LNA3_ID_MON[1..3]
LNA1_D4
LNA2_D2
SYNC1
VDD
SCLK
LNA3_G3
VGS_MON
SYNC2
LNA2_G4
R311.0K
LNA4_VD_SET[1..3]
LNA3_VD_SET[1..3]
J1100-964-053
A1A2A3A4A5A6A7A8A9
A10A11A12A13A14A15A16A17A18A19A20A21A22A23A24A25A26A27A28A29A30A31A32
C1C2C3C4C5C6C7C8C9C10C11C12C13C14C15C16C17C18C19C20C21C22C23C24C25C26C27C28C29C30C31C32
ALMA04023SX0016
ALMA Quad LNA Bias Card
Atacama Large Millimeter Array (ALMA) Project
National Radio Astronomy Observatory949 N. Cherry Ave.Tucson, AZ 85721
B
1 23Thursday, August 23, 2001
Title
Size Document Number Rev
Date: Sheet of
LNA2_ID_MON[1..5]
LNA1_VD_MON[1..5]
ENAB_LNA1
LNA1_ID_SET[1..5]
AVCC
POWER_ON
LNA4_VG_MON[1..3]
LNA4_G2
LNA4_D[1..3]
LNA1_G[1..5]
LNA2_D4
LNA4_G[1..3]
LNA2_D1
LNA4_D1
VCC
VDD
LNA4_VD_MON[1..3]
LNA1_D3
LNA4_ID_SET[1..3]
LNA3_D3
LNA2_D3
To 5-StageLNA #1
To 5-StageLNA #2
To 3-StageLNA #3
To 3-StageLNA #4
Bob HaywardReceiver Engineer
Feed & Front End PDR12-13 Feb 2002
20
NRAO-TucsonALMA Quad LNA Bias
Card OverviewLNA1_VD_MON[1..5]
3VGS2
U5
AD5532ABC-1
A2
A3
A4
A5
A6
A7
A8
A9A10
B1
B3
B4
B5
B6
B7
B8
B9
B10
B11
C1
C2
C10
C11
D1
D2
D10
D11
E1
E2
E10
E11
F1
F2
F10
F11
G1
G2
G10
G11
H1
H2
H10
H11
J1
J2
J6
J10
J11
K1
K2
K3
K4K5 K6K7
K8
K9
K10K11
L2L3L4
L5L6 L7
L8
L9L10
A4
A2
A0
CS/SYNC
DVC
C
SCLK
OFFSET_SEL
BUSYTRACK/RESET
VO16
A3
A1
WR
DG
ND
DIN
CAL
SER/PAR
DOUT
REF_IN
VO18
DAC
_GN
D1
AVC
C1
REF_OUT
VO20
DAC
_GN
D2
AVC
C2
OFFS_OUT
VO26
VO14
AGN
D1
OFFS_IN
VO25
VO21
AGN
D2
VO6
VO24
VO8
VO5
VO3
VO23
VIN
VO4
VO7
VO22
VO19
VSS2
VO9
VO11
VO17
VO15
VO27
VSS3
VSS1
VSS4
VDD
2
VO2
VO10
VO13VO12
VO28VO29VO30VD
D3
VDD
1
VDD
4
VO31
VO0VO1
1IDS2
2IDS1
4VDS1
3IDS1
MON_A1
3SET_VD2
VDD
2IDS2
1SET_VD2
+
C8
10uF
2IDS[1..5]
2SET_ID1
4SET_ID2
2SET_ID4
U7SN74AHC1G04
2 4
4IDS[1..3]
3VDS[1..3]
LNA1_ID_MON[1..5]
MON_A3
2SET_VD3
DIN
1VDS[1..5]
1VGS1
1SET_ID4
1VGS[1..5]
1SET_ID1
C5
0.1uF
4VGS2
VSS
1VGS2
4SET_ID[1..3]
MON_A3
C7
0.1uF
+
C1
10uF
2VGS2
1SET_VD[1..5]
LNA1_VG_MON[1..5]
LNA2_ID_SET[1..5]
MON_A2
4SET_VD1U6
DG406DN
151617
18
1920212223242526
28
456789
1011
14
127
A2A1A0
EN
S1S2S3S4S5S6S7S8
D
S16S15S14S13S12S11S10S9
A3
+VCC-VCC
VDS_MON
1VDS5
2SET_VD1
2VGS5
ALMA04023SX0016
ALMA Quad LNA Bias Card
Atacama Large Millimeter Array (ALMA) Project
National Radio Astronomy Observatory949 N. Cherry Ave.Tucson, AZ 85721
B
2 23Thursday, August 23, 2001
Title
Size Document Number Rev
Date: Sheet of
1IDS5
2VGS1
1SET_ID5
VCC
2IDS4
3VDS3
VDD
3VGS[1..3]
LNA4_VG_MON[1..3]
2VDS4
4IDS3
VD_MON
1VGS5
3SET_ID3
SYNC2
2VDS[1..5]
MON_A[0..3]
IDS_MON
2VDS5
-
+
U4B
TL034CD
5
67
LNA2_VD_MON[1..5]
4IDS2
MON_A3
VCC LNA2_VD_SET[1..5]
VGS_MON
2SET_ID[1..5]
LNA3_ID_SET[1..3]
4SET_VD2
2SET_VD4
LNA1_ID_SET[1..5]
LNA3_VG_MON[1..3]
MON_A[0..3]
-
+
U4A
TL034CD
3
21
1IDS[1..5]
3IDS2
VCC
ID_MON
VDD
2SET_VD2
LNA4_VD_SET[1..3]
VDD
1VDS2
2VDS1
1SET_VD3VCC
AVCC
1IDS43SET_ID1
3VGS1
3SET_VD1
LNA4_VD_MON[1..3]
2IDS3
4IDS1
MON_A2
-
+
U4C
TL034CD
10
98
LNA3_ID_MON[1..3]
1VDS3
MON_A1
2SET_VD5
VSS
3VDS1
4SET_VD3
U3
DG406DN
151617
18
1920212223242526
28
456789
1011
14
127
A2A1A0
EN
S1S2S3S4S5S6S7S8
D
S16S15S14S13S12S11S10S9
A3
+VCC-VCC
1SET_VD4
+
C3
10uF
1SET_VD1
VCC
SCLK
MON_A2
Connect AGND and DGND at asingle point, close to AD5532.
3SET_ID2
2SET_VD[1..5]
1VGS3
3IDS[1..3]
4SET_ID3
3VGS3
4VDS2
2VGS4
4VGS[1..3]
2IDS5
1VGS4
1IDS3
U9AD780BR
2
4
3
6
58
IN
GND
TEMP
OUT
TRIMOP_SEL
AVCC
VSS
3VDS2
LNA4_ID_SET[1..3]
2VGS[1..5]
4VGS1
+
C2
10uF
LNA2_VG_MON[1..5]
1SET_ID[1..5]
3SET_VD[1..3]
2SET_ID2
LNA2_ID_MON[1..5]
1SET_ID3
C6
0.1uF
1SET_ID2
4VDS[1..3]
3IDS3
MON_A0
2VDS3
4SET_ID1
LNA3_VD_MON[1..3]
2SET_ID3
LNA4_ID_MON[1..3]
2VDS2
2VGS3
VG_MON
LNA3_VD_SET[1..3]
MON_A0
4VDS3
3SET_VD3
U8
DG406DN
151617
18
1920212223242526
28
456789
1011
14
127
A2A1A0
EN
S1S2S3S4S5S6S7S8
D
S16S15S14S13S12S11S10S9
A3
+VCC-VCC
C4
0.1uF
1VDS1
1SET_VD5
1VDS4
MON_A0
4SET_VD[1..3]
2SET_ID5
LNA1_VD_SET[1..5]
MON_A1
4VGS3
3SET_ID[1..3]
VSS
1IDS1
Bob HaywardReceiver Engineer
Feed & Front End PDR12-13 Feb 2002
21
NRAO-TucsonALMA Quad LNA Bias
LNA Bias Circuit
R3627.4
1. All resistors are thick film SMD (0603), 1% unless specified otherwise.
R331K
VG_ON
NOTES:
2. All capacitors are ceramic SMD (0603). ALMA04023SX0016
ALMA Quad LNA Bias Card: LNA1, Stage1
Atacama Large Millimeter Array (ALMA) Project
National Radio Astronomy Observatory949 N. Cherry Ave.Tucson, AZ 85721
A
8 23Saturday, July 28, 2001
Title
Size Document Number Rev
Date: Sheet of
R35
27.4K
R30
100K R3247.5K
VD_SET
R38
274K
R2910K
U26A
EZADT
102
Q2BFMB3946
24
3
DRAIN
R31274K
U23A
EZADT
102
-
+
U24C
TL034CD
10
98
C109
0.1uF
U27BADG202AKR
151614DIN
S
3.3V
R24100
R26332K
DRAIN
C111
0.33uF
ID_MON
-
+
U24B
TL034CD
5
67
VD_MON
GATE
R23
100K 0.1%
-
+
U24A
TL034CD
3
21
-
+
U20A
TL034CD
3
21
C1070.1uF
VD_ON
GATE
-
+
U24D
TL034CD
12
1314
-
+
U22A
TL034CD
3
21
R27
100K 0.1%
VG_MON
R28
2.21KQ2AFMB3946
5
1
6
R373.01K
D8MMSZ5226BS
R25
100K 0.1%
C110
1uF
C1080.033uF
R22
100K 0.1%
VDD
D111N4148WS
GATE
D91N4148WS
U21A
EZADT
10 2
D101N4148WS
ID_SET
R344.75K
U25AADG202AKR
21
3D
INS
U27AADG202AKR
2 13 D IN
S
Bob HaywardReceiver Engineer
Feed & Front End PDR12-13 Feb 2002
22
Monitor by Exception
• If go with minimum amount of processing power:– Instead of monitoring all the voltages, all the time
• Each VG compared to its saved “OK” value– If all are OK, a monitor bit is “low”– If any are not OK, the bit goes “high”
– For diagnostics, the MIB can cycle through and read back all voltages and currents on command
– Bias voltages set by non-volatile “digital pots”• Could be changed, if required, at any time
– But Cryo & Vacuum need continuous monitoring
Bob HaywardReceiver Engineer
Feed & Front End PDR12-13 Feb 2002
23
Monitor Continuously
• If use a Rx �C with lots of processing power:– Monitor all the voltages, all the time
• Each VD, ID & VG compared to its saved value– Reload if “set” values are not correct– Catches instances where LBC card has lost power
• Provides processed data to an Engineering M&C Lap Top as well as Master Control Computer
• Temp in�C, Pressure in microns, etc
• Can the MIB handle this?
Bob HaywardReceiver Engineer
Feed & Front End PDR12-13 Feb 2002
24
Design Work
• Will need New Cards– Temperature, Vacuum, Control Boards
• Straight forward - just update our existing design• Do more on less real estate
– LNA Bias Card• New (or modified NRAO) design
– Software• Depends on whether done in MIB or dedicate Rx �C
• May need to hire a new junior engineer?
Bob HaywardReceiver Engineer
Feed & Front End PDR12-13 Feb 2002
25
CryogenicsRefrigerator Drives
• The Refrigerator Motor on each Rx requires a 150 Volt, 2-Phase Supply
• We now derive the Second Phase using a R-C Network– Requires a separate “box” for each Front End– Requires “tuning” to get phase shift right
• Proposed Alternate: Scott Tee
Bob HaywardReceiver Engineer
Feed & Front End PDR12-13 Feb 2002
26
CryogenicsScott Tee
• A Way of Connecting Two Transformers to derive 2-phase from 3-phase
• Smoother Drive Without Tuning• Transformers Already In-House• Mount in Module or Bin
– Include Vacuum Pump Control, He Pressure Sensors, etc.
Bob HaywardReceiver Engineer
Feed & Front End PDR12-13 Feb 2002
27
CryogenicsHelium Compressor
• VLA currently has 2 compressors supplying 80 S.C.F.M. (total) to 5 refrigerators per antenna
• EVLA will need 120 S.C.F.M. for 8 refrigerators• New compressors required
• Testing of a higher flow compressor already started• Direct replacement• Cost – on the order of $350K