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Serial BERT N4906B, Data Sheet V.3 7

The pattern generator generates hardware-based

PRBS up to 2

-1 and user defined patterns. It

provides a memory depth of 32 Mbit. Pattern

format is compatible within the N4900 series.

Therefore user defined patterns can be trans-

ferred across the N4900 serial BERT series.

Features:

Differential outputs

Adjustable output

Amplitude and levels

Clock/data relative delay adjustment

Adjustable crossing point

Output blanking (burst mode)

Error insertion

Trigger output

Alternating pattern

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Figure 11: Front view of pattern generator

Pattern Generator

Waveform example for differential data output

Data Output

Table 1: Parameters for N4906B serial BERT generator. All

timing parameters are measured at ECL levels.

Range of operation

Option 003 150 Mb/s

to 3.6 Gb/s

Option 012 9.5 Gb/s to 12.5 Gb/s

Option 102

150 Mb/s

to 12.5 Gb/s

Format NRZ, normal or inverted

Amplitude/resolution 0.1 V to 1.8 V/ 5 mV steps

Output voltage window -2.0 V to +3.0 V

Predefined levels ECL, PECL (3.3 V), LVDS,

CML

Data interface

Differential or single-ended

DC coupled, 50 Ω

Transition times

20% to 80% < 20 ps typ.

10% to 90% < 25 ps

With N4915A-001 < 50 ps typ.

transition time converter

Jitter 9 ps pp typ.

Clock/data delay range ±0.75 ns

Resolution 100 fs

External termination -2 V to +3 V

voltage

Crossing point 20%.......80% typ. adjustable

Single error inject Adds single errors on

demand

Fixed error inject Fixed error ratios of 1 error

in 10

bits, n = 3, 4, 5, 6,

7, 8, 9

Connector 2.4 mm female

2.4 mm to 3.5 mm adapters

are included

1) 150 MHz to 3.6 GHz external clock, 620 Mb/s to 3.6 Gb/s

internal clock.

2) Only in combination with option 012.

3) 150 MHz to 12.5 GHz external clock, 620 Mb/s to 12.5 Gb/s

internal clock.

4) Unused outputs must be terminated with 50 Ω to GND.

5) Only option 012 at 10 Gb/s.

6) Recommended for option 003.

7) For positive termination voltage or termination to GND,

external termination voltage must be less than 3 V below

VOH. For negative termination voltage, external termination

voltage must be less than 2 V below VOH. External termina-

tion voltage must be less than 3 V above VOL.

Figure 12: Output signal at 50% crossing point and 12.5 Gb/s

(option 012)

dataTec GmbH

•

Ferdinand-Lassalle-Str. 52

•

72770 Reutlingen

•

Tel. 07121 / 51 50 50

•

Fax 07121 / 51 50 10

•

info@datatec.de

•

www.datatec.de

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