Introduction to 85108A Pulsed Network Analyzers Pengcheng Jia Dec 13, 2001

Outline What is measurement? What is 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: ESD Protection User setting, Gauging,Always use ESD Protection Check Hardware: DUT, Cables, Connectors Calibrate Verify Measure Analyze and Archive

Measure S Parameters

85108A System Configuration

System Cabling Diagram 2 Bands Test Set works from 1-50 GHz in 2 Bands: 1-20 GHz 1-20 GHz Use directly LO source GHz 6-50 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 D 50 MHz to 40 GHz 100 dB of dynamic range Excellent measurement accuracy Two measurement channels Four display channels

Difference: 85108A—8722D 8722D85108A Freq Range50M-40G1-20G,6-50G AccuracyN/A0.01dB Pulsed RFNY Pulse Profile (Time Domain)NY Sweep ModeRamp ModeStep Mode IF Bandwidth3KHz1.5MHz, 10KHz High Power Meas.NY

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 f 4KHz 3KHz BW Ramped

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

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 Test Port Port1 & Port2: +43 dBm RF Input Port: +17 dBm +17 dBm +43 dBm

Connectors for NA ConnectorDielectricFreqMate with WrenchNote SMAYes18G3.5, 2.95lb.inNot recommend to mate with 3.5, No26.5GSMA,2.98lb.inHP PSC connector 2.9(K)No40GSMA,3.58lb.inHP PSC, Wiltron K 2.4No50G1.858lb.inHP PSC 1.85(V)Yes65G2.4HP PSC, Wiltron V PSC: Precision Slotless Connector

Cables for NA Connectors on Port 1 & 2 is 2.4 mm Never Remove Them 2.4 to 2.9 (K) adaptors are put to mate with K connector cables, Never Remove Them Always Keep Connects & Adaptors Clean Always 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 Calibration Constants before Calibration 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 Remove a Calibration Standard from the Box or Use for Any Purpose Other Than Calibration Never Drop the Standards to Ground Never Drop the Standards to Ground Always Use Special Wrench Correctly Always Use Special Wrench Correctly Put the Cal Kits Back to Cabinet after Use Put the Cal Kits Back to Cabinet after Use Report Any Discrepancy Report 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->Detector: Wide BW Wide 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 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 configuration