Introduction to 85108A Pulsed Network Analyzers

1
Introduction to 85108A Pulsed Network Analyzers

• Pengcheng Jia
• Dec 13, 2001

2
Outline

• What is measurement?
• What is 85108 Pulsed Network Analyzer?
• What are the Connectors Cables?
• What are the Calibration Kits?
• What is Non-Insertable Calibration?
• How to do Pulsed Measurement?
• How to Control by Computer?

3
What is measurement

• Define Measurement
• f, P, T, expected values and tolerance.
• Define System Configuration
• Configure Hardware
• User setting, Gauging, Always use ESD Protection
• Check Hardware DUT, Cables, Connectors
• Calibrate
• Verify
• Measure
• Analyze and Archive

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Measure S Parameters
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85108A System Configuration
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System Cabling Diagram
LO source 10M-20 G RF source 10M-50 G Test Set
1-50 GHz
Test Set works from 1-50 GHz in 2 Bands 1-20 GHz
Use directly LO source. 6-50 GHz Use third
harmonic of LO source.
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85110A Test Set Signal Flow
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Simplified NA - 8722D
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Difference 85108A8722D
8722D 85108A
Freq Range 50M-40G 1-20G,6-50G
Accuracy N/A 0.01dB
Pulsed RF N Y
Pulse Profile (Time Domain) N Y
Sweep Mode Ramp Mode Step Mode
IF Bandwidth 3KHz 1.5MHz, 10KHz
High Power Meas. N Y
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Avoid Large Time Delay of DUT
Frequency Sweep
f
Step Mode 85108A
t
200 ms
f
Ramp Mode 8722D
t
DUT
3KHz BW
?10 ns
Original
Ramped
8722D with 3K IF BW
f
4KHz
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Pulse Meas.- Freq Domain

• Point-in-Pulse
• Freq Domain Meas.
• Use 1.5M Broadband IF filter (Normal meas. use
  10K IF filter)
• Adjustable Duty Cycle
• Default 10
• Adjustable Pulse Width
• Default 10 ms, min 1us
• Trigger time 5ms from 0

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Pulse Meas.-Time Domain

• Display Time Domain Pulse Profile
• Choose Pulse Profile in Domain menu
• Measure only at a single frequency

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High Power Meas.
43 dBm
43 dBm
17 dBm
17 dBm
Never Exceed the Power Limitation on the Test
Port Port1 Port2 43 dBm RF Input Port 17 dBm
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Connectors for NA
Connector Dielectric Freq Mate with Wrench Note
SMA Yes 18G 3.5, 2.9 5lb.in Not recommend to mate with 3.5, 2.9
3.5 No 26.5G SMA,2.9 8lb.in HP PSC connector
2.9(K) No 40G SMA,3.5 8lb.in HP PSC, Wiltron K
2.4 No 50G 1.85 8lb.in HP PSC
1.85(V) Yes 65G 2.4 HP PSC, Wiltron V
PSC Precision Slotless Connector
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Cables for NA

• Cables (only following cables can be used for
  NA)
• Semi-Rigid with K connectors
• FlexibleThin Jacket with K connectors (Blue,
  from Gore)
• FlexibleThick Jacket with 2.4 mm connectors
  (Black, from Agilent)

• Connectors on Port 1 2 is 2.4 mm
• 2.4 to 2.9 (K) adaptors are put to mate with K
  connector cables, Never Remove Them
• Always Keep Connects Adaptors Clean
• Treat Them Gentle and Put Back to Box

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Cautions

• Select Correct Cal Kit and Load Calibration
  Constants before Calibration
• Never Remove a Calibration Standard from the Box
  or Use for Any Purpose Other Than Calibration
• Never Drop the Standards to Ground
• Always Use Special Wrench Correctly
• Put the Cal Kits Back to Cabinet after Use
• Report Any Discrepancy

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Load Configuration Disk

• Load the Test Set Configuration Disk for 85110A
  with H60/61 option
• (Disks are stored in Drawers, never remove
  them)
• Disk-gtStorage is Internal
• Load-gtMore-gtMachine Dump
• MD_1_20_NP, 1-20 GHz, Non-Pulsed
• MD_1_20_PL, 1-20 GHz, Pulsed
• MD_6_50_NP, 6-50 GHz, Non-Pulsed
• MD_6_50_NP, 6-50 GHz, Pulsed

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Calibration Procedure

• Press Cal menu
• Choose Calibration Kit, if not installed in
  equipment, load the cal constant from disk
• Choose in the Calibration Menu
• LRM for on-wafer Calibration, Full 2-port for
  cable calibration
• Follow instruction, connect standards and
  measure
• Save calibration data
• You will see Correction On

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Error Model for Full 2-Port Cal
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Calibration Non-Insertable DUT
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Swap Equal Adaptors
Swap Equal Between-Series Adaptors
Swap Equal In-Family Adaptors
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Adaptor Removal

• Calibration with adaptor on Port 2, save as Cal
  Set 1
• Calibration with adaptor on Port 1, save as Cal
  Set 1
• Modify Cal Set-gtAdaptor Removal

• Refer the additional document for more details
• More calibration methods are included in that file

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Calibration with On-Wafer Kit

• Use WinCal on Controller-Dizzy
• Calibration Constant is set in program
• Choose LRM, since short is not good
• LRRM is recommended for more accuracy

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How to do Pulsed Meas.(1)

• Frequency Domain (Point-in-Pulse)
• Domain-gtFrequency
• System-gtMore-gtPulse Config-gtDetector
• Wide BW
• Select Maximum Points
• Calibration
• System-gtMore-gt Pulse Config-gt High or Low
• Set Pulse Width, Duty Cycle
• Stimulus-gtMore-gtTrigger Mode-gtTrigger Delay
• Measure

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How to do Pulsed Meas.(2)

• Pulse Profile Domain - Single Frequency
• Domain-gtFrequency
• Stimulus-gtStep mode Start-gtSet desired
  frequency
• Domain-gtPulse Profile
• Select Maximum Points
• Calibration
• Measure
• Repeat for Next Frequency

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How to do Pulsed Meas.(3)

• Pulse Profile Domain Frequency List
• Cal-gtCorrection off
• Domain-gtFrequency
• System-gtMore-gtPulse Config-gtDetector Wide BW
• Stimulus-gtMore-gtEdit List
• Add-gtStart-gt3 G/n, Number of Points-gt51x1-gtDone
• Add-gtStart-gt4 G/n x1-gtDone
• Add-gtStart-gt5 G/n x1-gtDone
• Done Frequency List, and Proceed with Calibration

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How to do Pulsed Meas.(4)

• Using Frequency List Continue
• When begin to Measure
• Domain-gt Pulse Profile
• Stimulus-gtFrequency List-gtSingle Segement
• The last selected segment will be active and
  ready for measurement
• Calibration will be effective for each frequency
  point
• Set Pulse Polarity, Pulse Width and Duty cycle
  if needed

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Computer Control

• 2 GPIB Connectors are on the back of 8510C
• 1 for 85108 System bus (dont touch)
• 1 for computer controller (already connected)
• Dizzy is the controller
• Use WinCal for On-Wafer Calibration and
  S-Parameter Measurement
• Choose the correct VNA first
• Config-gtOption-gtVNA-gt8510 or 8722
• Use Labview Program for 85108 configuration