Introduction to 85108 A Pulsed Network Analyzers Pengcheng

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

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

Measure S Parameters

85108 A System Configuration

System Cabling Diagram LO source: 10 M-20 G RF source: 10 M-50 G Test Set: Test Set works from 1 -50 GHz in 2 Bands: Bands 1 -20 GHz Use directly LO source. 6 -50 GHz Use third harmonic of LO source. 1 -50 GHz

85110 A Test Set Signal Flow

Simplified NA - 8722 D • 50 MHz to 40 GHz • 100 d. B of dynamic range • Excellent measurement accuracy • Two measurement channels • Four display channels

Difference: 85108 A— 8722 D Freq Range 8722 D 50 M-40 G 85108 A 1 -20 G, 6 -50 G Accuracy Pulsed RF N/A N 0. 01 d. B Y Pulse Profile (Time Domain) N Sweep Mode Ramp Mode IF Bandwidth 3 KHz High Power Meas. N Y Step Mode 1. 5 MHz, 10 KHz Y

Avoid Large Time Delay of DUT Frequency Sweep Step Mode: 85108 A f t 200 ms Ramp Mode: 8722 D f t DUT =10 ns Original 3 KHz BW Ramped 8722 D with 3 K IF BW 4 KHz f

Pulse Meas. - Freq Domain Point-in-Pulse • Freq Domain Meas. • Use 1. 5 M Broadband IF filter (Normal meas. use 10 K IF filter) • Adjustable Duty Cycle Default: 10% • Adjustable Pulse Width Default: 10 ms, min 1 us • Trigger time: 5 ms 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. +43 d. Bm +17 d. Bm Never Exceed the Power Limitation on the Test Port 1 & Port 2: +43 d. Bm RF Input Port: +17 d. Bm

Connectors for NA Connector Dielectric Freq Mate with Wrench Note SMA Yes 18 G 3. 5, 2. 9 5 lb. in Not recommend to mate with 3. 5, 2. 9 3. 5 No 26. 5 G SMA, 2. 9 8 lb. in HP PSC connector 2. 9(K) No 40 G SMA, 3. 5 8 lb. in HP PSC, Wiltron K 2. 4 No 50 G 1. 85 HP PSC 1. 85(V) Yes 65 G 2. 4 8 lb. in PSC: Precision Slotless Connector HP PSC, Wiltron V

Cables for NA • 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) • 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

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

Load Configuration Disk n n Load the Test Set Configuration Disk for 85110 A with H 60/61 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 • 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 • Refer the additional document for more details • More calibration methods are included in that file

Calibration with On-Wafer Kit • Use Win. Cal 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 • 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->51 x 1 ->Done • Add->Start->4 G/n x 1 ->Done • Add->Start->5 G/n x 1 ->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 8510 C 1 for 85108 System bus (don’t touch) 1 for computer controller (already connected) • Dizzy is the controller • Use Win. Cal for On-Wafer Calibration and SParameter Measurement Choose the correct VNA first Config->Option->VNA->8510 or 8722 • Use Labview Program for 85108 configuration