for WavePulser 40iX High Speed Interconnect Analyzer April-2020 - PowerPoint PPT Presentation

De-embedding methods for WavePulser 40iX High Speed Interconnect Analyzer April-2020 Giuseppe Leccia Business Development Manager

WavePulser 40iX: Testing in frequency and time domain Frequency Domain Time Domain The combination of S-parameters VNA TDR (frequency domain) and Impedance Profile (time domain) in a single acquisition with a deep toolbox for simulation, emulation, de-embedding and time-gating provides: Deep Toolbox (S-parameter de-embedding, Time Gating, Emulation equalized eye-diagram and jitter analysis ) De-embedding methods for WavePulser 40iX - April 2020 2

WavePulser 40iX in a nutshell Testing in frequency and time in a single acquisition De-Embedding Spatial Resolution < 1 mm DC to 40 GHz Time Gating Differential and Common mode Mixed-mode Step and Impulse response Equalized eye-diagram S-parameters (rise time < 8.5 ps) Jitter Analysis Impedance Profile Frequency Domain Deep Toolbox Time Domain WavePulser 40iX High Speed Interconnect Analyzer De-embedding methods for WavePulser 40iX - April 2020 3

WavePulser 40iX three methods of de-embedding ❑ When measuring S-parameters the DUT is rarely High-speed Interconnect Analyzer: connected directly to the measurement instrument. ❑ Generally extra circuitry exists between the DUT the ideal single tool for high-speed and the instrument. Examples are cables, adapters and test fixtures. hardware designers and test engineers ❑ De-embedding is the act of removing the extra circuitry surrounding the DUT that is only present for the purpose of making the measurement. WavePulser 40iX has three methods of de- embedding: 1- Calibration methods 2- Time-domain methods 3- Traditional frequency-domain methods De-embedding methods for WavePulser 40iX - April 2020 4

De-embedding using manual calibration Manual calibration for any user defined reference plane Pulser Sampler Pulser Sampler cables, adapters and fixtures WavePulser40iX D.U.T unknown Pulser Sampler Pulser Sampler Manual calibration: measurement reference plane short-open-load-thru (SOLT) calibration kit or known standards structures on the fixture itself De-embedding methods for WavePulser 40iX - April 2020 5

De-embedding using second-tier calibration Combined the advantages of the manual calibration with the internal built-in automatic calibration. Pulser Sampler Pulser Sampler cables, adapters and fixtures WavePulser40iX D.U.T unknown Pulser Sampler Pulser Sampler 1- the internal auto calibration takes care of drift and changes Auto Calibration: Manual calibration: in pulse/sampler performance. measurement reference plane measurement reference plane 2- the manual calibration is to know more go to: performing the de-embedding https://teledynelecroy.com/doc/second-tier-calibration operation. De-embedding methods for WavePulser 40iX - April 2020 6

De-embedding using time domain methods Port 1 Port 2 Impedance Profile S-parameters Impedance profile trace Port 2 Using the information from the impedance profile trace, time-domain de-embedding methods include: Return Loss ▪ time-gating also called port-extension ▪ peeling algorithms using small sections to know more go to: with the measured impedance for the https://teledynelecroy.com/doc/time-domain-techniques frequency development of a de-embedding model De-embedding methods for WavePulser 40iX - April 2020 7

De-embedding using traditional frequency-domain methods ❑ Traditional frequency-domain method for de-embedding is the Pulser cable 1 Adapter 1 act of removing the s-parameters Sampler for known extra circuitry that is only present for the purpose of Pulser Adapter 2 cable 2 Sampler making the measurement. WavePulser40iX Fixture D.U.T ❑ WavePulser 40iX frequency- Pulser cable 3 Adapter 3 domain methods for de- Sampler embedding includes: Pulser Adapter 4 cable 4 Automatic built-in calibration Sampler ❑ cable de-embedding is a key competitive user cables are user adapters are Test fixture are advantage de-embedded de-embedded de-embedded ❑ adapter de-embedding measurement reference plane Auto Calibration: measurement reference plane Take a DC to 40 GHz ❑ fixture de-embedding = measurements in few measurement reference plane instrument reference plane minutes measurement reference plane De-embedding methods for WavePulser 40iX - April 2020 8

Cables and adapters de-embedding ❑ Traditional frequency-domain method for de-embedding is the Pulser cable 1 Adapter 1 act of removing the s-parameters Sampler for known extra circuitry that are only present for the purpose of Pulser Adapter 2 cable 2 Sampler making the measurement. WavePulser40iX D.U.T ❑ Cable and adapter de- Pulser cable 3 Adapter 3 embedding solve the de- Sampler embedding requirement when Pulser the problem is posed as two-port Adapter 4 cable 4 Automatic built-in calibration Sampler devices between the instrument is a key competitive user cables are user adapters are ports and the DUT ports advantage de-embedded de-embedded Auto Calibration: measurement reference plane Take a DC to 40 GHz = measurements in few measurement reference plane instrument reference plane minutes measurement reference plane De-embedding methods for WavePulser 40iX - April 2020 9

Fixture de-embedding ❑ Traditional frequency-domain method for de-embedding is the Pulser 1 1 8 cable 1 Adapter 1 act of removing the s-parameters Sampler for known extra circuitry that is only present for the purpose of Pulser 2 2 7 Adapter 2 cable 2 Sampler making the measurement. Fixture WavePulser40iX D.U.T (any arbitrary circuit) fixture.s8p ❑ Fixture de-embedding is capable Pulser 3 3 6 cable 3 Adapter 3 of solving any traditional Sampler frequency-domain de-embedding 4 5 4 Pulser requirement. Adapter 4 cable 4 Sampler user cables are user adapters are Test fixture are ❑ It assumes one large fixture de-embedded de-embedded de-embedded between all ports of the measurement reference plane Auto Calibration: measurement instrument cables + adapters+ fixture measurement reference plane de-embedded = and all ports of the DUT instrument reference plane ❑ Port number assumption is fixed as shown on this slide De-embedding methods for WavePulser 40iX - April 2020 10

Fixture de-embedding: 4-port DUT with two 4-port fixtures on each end ❑ Fixture de-embedding is capable of solving any traditional frequency- domain de-embedding requirement. Pulser 1 1 8 cable 1 Adapter 1 Sampler 1 4 L_fixture.s4p ❑ Common example of a 4-port DUT 2 3 Pulser whereby two 4-port fixtures are used 2 2 7 Adapter 2 cable 2 Sampler at each end: Fixture WavePulser40iX ❑ L_fixture.s4p D.U.T (any arbitrary circuit) ❑ R_fixture.s4p fixture.s8p Pulser 3 3 6 cable 3 Adapter 3 1 4 Sampler ❑ Open-source software called R_fixture.s4p SignalIntegrity offered by Teledyne 2 3 4 5 4 Pulser Adapter 4 cable 4 LeCroy uses Left and Right 4-port Sampler fixtures to create the file fixture.s8p user cables are user adapters are Test fixture are de-embedded de-embedded de-embedded ❑ Signal Integrity application allows you measurement reference plane Auto Calibration: to specify the number of points and cables + adapters + fixture measurement reference plane de-embedded = end frequency that should be used instrument reference plane for the de-embedding Open-source Signal Integrity software: https://github.com/TeledyneLeCroy/SignalIntegrity/wiki De-embedding methods for WavePulser 40iX - April 2020 11

De-embedding methods for WavePulser 40iX WavePulser 40iX contains multiple de-embedding methods including: ❑ Calibration methods ❑ Time-domains methods ❑ Traditional frequency-domain methods Traditional frequency-domain methods for de-embedding includes: ❑ cable de-embedding ❑ adapter de-embedding ❑ fixture de-embedding Fixture de-embedding can be used to solve any frequency- domain de-embedding problem creating fixture s-parameters, which can be performed using open source SignalIntegrity software To know more go to: https://teledynelecroy.com/doc/de-embedding-methods De-embedding methods for WavePulser 40iX - April 2020 12