10GBASE-T Transmitter SNDR Definition (System ID Approach) IEEE P802.3an Task Force Santa Clara, Feb 2005 Albert Vareljian, Hiroshi Takatori KeyEye
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1 10GBASE-T Transmitter SNDR Definition (System ID Approach) IEEE P802.3an Task Force Santa Clara, Feb 2005 Albert Vareljian, Hiroshi Takatori KeyEye 1
2 OUTLINE Transmitter Performance Evaluation Block Diagram and Example Tx Impairment Walk-through System ID Methodology: Transmitter Characterization Metric Definition 10GBASE-T Transmitter Compliance Specification at MDI: Estimated Signal-to-Total-Noise and Distortion Ratio (SNDR) in a given Bandwidth Conclusion 2
3 Transmitter Performance Evaluation Block Diagram Continuous Time Modeling Discrete-Time Float Point MDI Class E Discrete-Time Float Point Tx 100m Σ Rx 1 2 Non-Linear, Clock Jitter Q- and Background Noise 1. PAM, PreCoder H(D) 2. Tx LPF 3 rd BWT 400 MHz, xformer 1 st HPF 120 khz, LPF 600 MHz, 0.5 db Loss 3. xformer 1 st HPF 120 khz, LPF 600 MHz 4. Rx HPF 1 st 10, 20 and 30 MHz 5. Rx LPF BWT 2 nd 400 MHz 6. Rx FFE FIR < 24 Tap, BLW Compensation, Decision Device AWGN -140 dbm/hz 4.2 GHz BW Fs, Phi 6 Slicer SNR, Rx Noise Figure Degradation 3
4 Tx Chain Key Impairments Analog and Digital Non-Linear Distortion (Active and Passive: xformer, ) Quantization and Background Noise Noise due Tx Clock Jitter Slew Rate Limitations Related Imperfect DSP Spurious Clock Leakage, Supply, Parasitic Coupling, etc Need a Compact and Meaningful Metric to Account for the Net System Impact 4
5 Transmitter Noise-Like Broadband Output: Need Specialized Characterization Methodology Tx Ideal Output at MDI Noise-Like Time Domain Waveform Tx Ideal Output at MDI Frequency Domain PSD Signal Power pwr = f 0 psd ( f ) df Note Signal Power Converges fast with f 5
6 Tx Impairments Non-Linear Distortion Frequency Domain Single-Tone Dist. Yields db Act. Tx SNR 43.3 db SL SNR Loss ~0.4 db Asymmetrical Compression a 1 = 1.0 a 2 = a 3 = dbm/hz max Low-Pass type 2 3 vo ( t) = a1vin( t) + a2vin ( t) + a3vin ( t) v o < 1.25 V 6
7 Tx Impairments Non-Linear Distortion Time Domain Non-Linear Distortion Noise due to Asymmetrical Compression in Tx Chain Skewed Non-Gaussian Distribution Will Reduce with Power Back-off SNDR Improves 7
8 Tx Impairments Fast Tx Clock Jitter Frequency Domain Tx CLK Jitter ~5 ps rms BW 1-10 MHz Tx SNR 44 db SL SNR Loss 0.13 db -121 dbm/hz max High-Pass type 8
9 Tx Impairments Noise due to Fast Tx Clock Jitter Time Domain Noise due to 5 ps rms Tx CLK Jitter, BW 1-10 MHz Centered Non-Gaussian Distribution Will Reduce with Power Back-off SNDR Maintained 9
10 Tx Impairments Q- and Background Noise Frequency Domain Q- and Thermal Noise -126 dbm/hz Budget: 9 ENOB DAC Therm dbm/hz Gain < 2 Tx SNR 42.4 db SL SNR Loss 0.25 db -126 dbm/hz max App. White in-band 10
11 Tx Impairments Q- and Background Noise Time Domain Quantization and Background Noise -126 dbm/hz Centered Gaussian-like Distribution May or May NOT Reduce with Power Back-off SNDR May Degrade 11
12 Tx Impairments Overall Noise and Distortion Frequency Domain Tx SNDR 38.5 db SL SNR Loss < 0.65 db TOTAL Noise -119 dbm/hz max Slightly Colored Normal Operation Waveform SNDR in BW > = Fs is a Good Metric for Transmitter Characterization 12
13 Tx Impairments What is Observed at MDI Time-Domain Sequence Frequency Domain Analysis PASS How to Separate: TOTAL NOISE From SIGNAL Av. Power PASS System ID Tx SNDR PSD Mask and Average Output Power Compliance Checked Before SNDR 13
14 System ID Signal Post-Processing Scheme TX Captured Tx MDI Tx(n) Delay D N Tx Excitation Test Sequence SIGNAL PAM/ THP In(n) Adaptive FIR Filter LMS Out(n) RESPONSE RMS Error Min + Σ Estimated NOISE POST-PROCESSING ~x16 OSR 14
15 System ID Estimated Signal and Total Noise Time-Domain Processing Frequency Domain Analysis Example Tx Impairment SNDR: Actual 38.5 vs 38 db System ID Estimated in ~ 3GHz BW 15
16 Proposed System ID Tx SNDR Specification Analyzed EXAMPLE SYSTEM: Reasonably High Performance/ MDI Into 100 Ohm Estimated {Tx Output Signal Power} Tx_SNDR = > = 40 [ db ] Estimated {Tx Output Total Noise Power} 16
17 Conclusion Based on Detailed Analysis of Transmitter Major Impairments SNDR >= 40 db Objective Provides a Reasonable Feasibility and Complexity Trade-off between Transmitter and Receiver Sections, and is Proposed for the PHY Interoperability Compliance Testing at MDI Transmitter Qualification SNDR Metric at MDI and its Derivation Methodology Based on System ID Approach is Introduced Complimentary THP Processor Interoperability Compliance Method Needs to be Additionally Defined 17
18 Back Up Slides 18
19 Non-Linear Distortion Single-Tone Test Total Output Power Tx +16, -16 Sym > 8 dbm OVERLOAD Single Tone SNDR Test: Non-Linear, 5 ps Jitter, Q- and Background Pass Actual Normal Operation SNDR = 38.5 db < 40 db Fail 19
20 Scope Source 50 MHz, ~46 db 2 nd Zoom 20
21 Scope Source 50 MHz, ~46 db 2 nd Zoom Scope Captured Sine Generator THD Confirmed by Spectrum Analyzer 21
22 Diff Probe Characteristics Input Noise = 3 mv in 7 GHz 36 nv/sqrt(hz) -139 dbm/hz Ref. to mv into 100 Ohm (0 dbm) 22
23 Non-Linear Input-Output TF Level Compression app 5.9 mv Level Compression app 21.5 mv Non-Linear 3 rd -Order Asymmetric Input-Output Transfer Function (Frequency-independent) 23
24 Non-Linear Input-Output TF Non-Linear 3 rd -Order Asymmetric Input-Output Transfer Function Compression Positive 24
25 Non-Linear Input-Output TF Non-Linear 3 rd -Order Asymmetric Input-Output Transfer Function Compression Negative 25
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