BERTScope® DPP Series

Digital Pre-emphasis Processor Datasheet
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Features & benefits

  • 1 to 12.5 Gb/s for Support of Hardware-based Equalization of 2nd- and 3rd-generation Serial Standards
  • 3- or 4-tap for Full Support of Compliance Testing for 802.3ap, Serial Attached SCSI, 10GBASE-KR Backplanes, DisplayPort™, USB 3.0 PCI Express® Gen3
  • Pre-cursor or Post-cursor Adjustment for Optimizing Compensation for ISI and Loss
  • Exceptionally Easy Setup with Concurrent Multiple Domain Views Ideal for Operation as a Stand-alone Instrument Controlled by a Remote PC, or with a BERTScope for Complete Software Integration
  • Precise Control to Correct for Effects such as Backplane ISI or Optical Effects with Adjustability through Tap Weights or Step Response provides the Flexibility Needed for Complete Design Characterization
  • Optional integrated reference clock multiplication to PCIe compliant 2.5 GHz, 5 GHz, and 8 GHz
  • Optional integrated eye opener functionality for testing DUTs with long channels
  • Optional integrated clock doubler that enables full rate stress for 12 Gb/s SAS
  • BERTScope Clock/Data delay compensated internally to allow length-matched matched cables
  • Enclosure with the BERTScope footprint to allow equipment stacking
  • New microcontroller to provide more processing power
  • RS-232 interface enhancement to speed up PCIe receiver equalization link training
  • Software to accommodate channel de-embedding and ISI fine adjustments

Applications

  • Design Characterization for High-speed, Sophisticated Designs
  • Certification Testing of Serial Data Streams for Industry Standards
  • Design/Verification of High-speed I/O Components and Systems
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Example functional block diagram (3-Tap shown).

The DPP125C is a nonlinear signal conditioner capable of adding controllable amounts of pre-emphasis to a signal. It takes in single-ended inputs of data and clock.

Intuitive control with many views
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Intuitive user interface gives multiple views of the output waveform.

The wave shape can be adjusted in the user interface by either directly entering tap weights, or through an amplitude-weighted time domain bitmap showing the step response. In addition to these two views, a frequency-domain Bode plot is calculated and displayed to show the effect being implemented. This is particularly helpful when counteracting the effects of circuit board ISI with a measured frequency response.

Adjustable output

Output amplitude is user adjustable in amplitude and offset, and is offered differentially.

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De-emphasized signal with sinusoidal jitter from a BERTScope.

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The BERTScope DPP Series can operate as a stand-alone instruments controlled by a PC, or with a BERTScope for complete software integration. It can be fully automated, and with its compact size, it will easily fit into a manufacturing environment.

Characteristics

Specifications

Characteristic

Specification

Notes

Data Rate Range

1-12.5 Gb/s

 

Inputs

Clock

Single Ended

SMA

   Sensitivity

250 mV (typ.)

 

   Termination

50 Ω, AC coupled

 

   Maximum jitter transfer

1:1

Input Clock to Output Data

Data

Single Ended

SMA

   Sensitivity

250 mV (typ.)

PN31 pattern

   Termination

50 Ω, AC coupled

 

Outputs

Data

Differential

SMA

   Max. Amplitude

1.8 V (typ.)

Differential, Adjustable

   Diff. skew

 

   Max. DC offset

±500 mV (typ.)

 

   Coupling

AC

AC-coupled data with DC‑coupled output offset

   Function

3- or 4-tap, clocked FIR

 

   Random jitter

RMS (typ.)

Additive, 1010 pattern

   Tap range

–100 to +100 (including 0) in 1% steps

 

   Tap resolution

1% or 0.1 dB, any tap

 

   Transition time

All taps, 1010 pattern

General

Control Interface

USB 2.0

 

Dimensions (W × H × D)

39.4 × 9.5 × 33.6 cm

(15.5 × 3.75 × 13.25 in.)

 

Weight

9 lb. (4 kg)

 

Power Consumption

 

Voltage

100-240 V AC, 45-63 Hz

Auto-range, IEC power plug

Emerging standards requirements

Standard

Required number of taps

Notes

802.3ap, 10GBASE-KR 10GbE Backplane

3

 

PCI Express 2.5 GT/s Receiver

2

0.7 dB for receiver testing

PCI Express 5 GT/s Transmitter

2

Selectable 3.5 dB and 6.0 dB levels on transmitters

PCI Express 8 GT/s

3

All preshoot and deemphasis settings in TxEQ coefficient matrix

SAS 6 Gb/s

2

2 dB for reference transmitters

2-4 dB for device transmitters

DisplayPort Transmitter 1.62 Gb/s and 2.7 Gb/s

2

Selectable 3.5 dB, 6 dB, or 9.5 dB on transmitters

USB 3.0 Transmitter 5 GT/s

2

3.5 dB nominal ±0.5 dB on transmitters

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