Introduction to 85108A Pulsed Network Analyzers

Pengcheng JiaDec 13, 2001

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?

What is measurement Define Measurement:

f, P, T, expected values and tolerance. Define System Configuration Configure Hardware:

User setting, Gauging, Always use ESD ESD ProtectionProtection

Check Hardware: DUT, Cables, Connectors Calibrate Verify Measure Analyze and Archive

Measure S Parameters

85108A System Configuration

System Cabling Diagram

Test Set works from 1-50 GHz in 2 2 BandsBands:

1-20 GHz 1-20 GHz Use directly LO source.

6-50 GHz6-50 GHz Use third harmonic of LO source.

LO source: 10M-20 G

RF source: 10M-50 G

Test Set: 1-50 GHz

85110A Test Set Signal Flow

Simplified NA - 8722D

                       •50 MHz to 40 GHz •100 dB of dynamic range •Excellent measurement accuracy •Two measurement channels •Four display channels

Difference: 85108A—8722D

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

Avoid Large Time Delay of DUT

f

t

Ramp Mode: 8722D

Frequency Sweep

f

t

Step Mode: 85108A

200 ms

DUT

=10 ns

8722D with 3K IF BW

Original

f4KHz

3KHz BW

Ramped

Pulse Meas.- Freq DomainPoint-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

Pulse Meas.-Time Domain

•Display Time Domain Pulse Profile

•Choose Pulse Profile in Domain menu

•Measure only at a single frequency

High Power Meas.

Never Exceed the Power Limitation on the Never Exceed the Power Limitation on the Test PortTest Port

Port1 & Port2: +43 dBmPort1 & Port2: +43 dBm

RF Input Port: +17 dBmRF Input Port: +17 dBm

+17 dBm+17 dBm +17 dBm+17 dBm

+43 dBm+43 dBm +43 dBm+43 dBm

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

Cables for NA

• 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 ThemNever Remove Them

• Always Keep Connects & Adaptors CleanAlways Keep Connects & Adaptors Clean

• Treat Them Gentle and Put Back to Box Treat Them Gentle and Put Back to Box

•Cables (only following cables can be used for NA):

Semi-Rigid with K connectors

Flexible—Thin Jacket with K connectors (Blue, from Gore)

Flexible—Thick Jacket with 2.4 mm connectors (Black, from Agilent)

Cautions:

• Select Correct Cal Kit and Load Select Correct Cal Kit and Load Calibration Constants before CalibrationCalibration Constants before Calibration

• Never Remove a Calibration Standard Never Remove a Calibration Standard from the Box or Use for Any Purpose from the Box or Use for Any Purpose Other Than CalibrationOther Than Calibration

• Never Drop the Standards to GroundNever Drop the Standards to Ground

• Always Use Special Wrench CorrectlyAlways Use Special Wrench Correctly

• Put the Cal Kits Back to Cabinet after Put the Cal Kits Back to Cabinet after UseUse

• Report Any DiscrepancyReport Any Discrepancy

Load Configuration Disk Load the Test Set Configuration Disk for

85110A with H60/61 option (Disks are stored in Drawers, never remove

them) Disk->Storage is Internal Load->More->Machine 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

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”

Error Model for Full 2-Port Cal

Calibration Non-Insertable DUT

Swap Equal Adaptors

Swap Equal Between-Series Adaptors

Swap Equal In-Family Adaptors

Adaptor Removal

•Refer the additional document for more details

•More calibration methods are included in that file

• 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->Adaptor Removal

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

How to do Pulsed Meas.(1)Frequency Domain (Point-in-Pulse)

• Domain->Frequency

• System->More->Pulse Config-System->More->Pulse Config->Detector: >Detector:

Wide BWWide BW

• Select Maximum Points

• Calibration

• System->More-> Pulse Config-> High or Low

• Set Pulse Width, Duty Cycle

• Stimulus->More->Trigger Mode->Trigger Delay

• Measure

How to do Pulsed Meas.(2)

Pulse Profile Domain - Single Frequency

• Domain->Frequency

• Stimulus->Step mode & Start->Set desired frequency

• Domain->Pulse Profile

• Select Maximum Points

• Calibration

• Measure

• Repeat for Next Frequency

How to do Pulsed Meas.(3)

Pulse Profile Domain – Frequency List

• Cal->Correction off

• Domain->Frequency

• System->More->Pulse Config->Detector: Wide BW

• Stimulus->More->Edit List

• Add->Start->3 G/n, Number of Points->51x1->Done

• Add->Start->4 G/n x1->Done

• Add->Start->5 G/n x1->Done

• Done Frequency List, and Proceed with Calibration

How to do Pulsed Meas.(4)

Using Frequency List – Continue:

•When begin to Measure:

Domain-> Pulse Profile

Stimulus->Frequency List->Single 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

Computer Control

• 2 GPIB Connectors are on the back of 8510C

1 for 85108 System bus (don’t 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->Option->VNA->8510 or 8722

• Use Labview Program for 85108 configuration