BERTScope® Digital Pre-emphasis Processor

DPP Series

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

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

Example functional block diagram (3-Tap shown).

The BERTScope DPP Series 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

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.

De-emphasized signal with sinusoidal jitter from a BERTScope.

The BERTScope DPP Series can operate as a stand-alone instrument controlled by a PC, or with a BERTScope for complete software integration. It can be fully automated, and with its compact size, the DPP 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	<2 ps (typ.)
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	<350 fs_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	<40 ps	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	<150 W
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	Proposed for transmitter
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