A Product Line of

Diodes Incorporated

PI2DPX2023

16

www.diodes.com

July 2022

Diodes Incorporated

PI2DPX2023

Document Number DS43532 Rev 4-2

JBERT (No Pre-emphasis)

Oscilloscope

Trace Card

Trace Card

Char Board(DUT)

Ch1

Ch2

Ch1

Ch2

SMA

cable

SMA

cable

SMA

cable

DUT

1) Trace card between TP1 and TP2 is designed to emulate 6-48” of FR4. Trace width -4 mils,100Ω differnetial impedance

2) All jitter is measured at a BER of 10-9

3) Residual jitter reflects the total jitter measured at TP4 jitter minus TP1 jitter

4) VDD = 1.8V, RT = 50Ω

5) The input signal from JBERT does not have any pre-emphasis.

TP1

TP2

TP3

TP4

Figure 9. Channel Measurement Setup

ML_TX_x_n

ML_TX_x_p

Source

Connector

Sink

Connector

Sink

Connector

Tx

Rx

50

50

Vbias_Tx

50

50

Vbias_Rx

Upstream device

Downstream device

ML_TX_x_n

ML_TX_x_p

ML_RX_x_n

ML_RX_x_p

ML_RX_x_n

ML_RX_x_p

Source

Connector

Tx

Rx

50

50

Vbias_Tx

50

50

Vbias_Rx

100k-1M

100k-1M

Figure 10. High-speed Channel Test Circuit

OUTxP

OUTxN

OUTyP

OUTyN

Output Intra-Pair Skew

50%

Output Inter-Pair Skew

Figure 11. Intra and Inter-pair Differential Skew Definition