Agilent Technologies J-BERT N4903B Manual de usuario descargar pdf (Pagina 10)

Speciﬁcations-Pattern Generator

Data output and auxiliary data output (DATA OUT, AUX DATA OUT)

Table 2. Output characteristics for J-BERT N4903B generator. All timing parameters are measured at ECL levels.

Range of operation

150 Mb/s to 14.2 Gb/s (Option D14, required in addition to C13 or G13)

150 Mb/s to 12.5 Gb/s (Option C13 or G13); can be programmed up to 13.5 Gb/s

150 Mb/s to 7 Gb/s (Option C07 or G07);

< 620 MHz only with external clock

Frequency accuracy ± 15 ppm typical

Format NRZ, normal or inverted

Electrical idle Output transitions from full swing signal to 0 V amplitude and vice versa at constant offset within 4 ns typ. Electrical

idle is controlled by the error add input connector

Amplitude/resolution 0.050 V to 1.800 V, 5 mV steps; addresses LVDS, CML, PECL, ECL (terminated to 1.3 V/0 V/-2 V), low voltage CMOS

Output voltage window - 2.0 V to +3.0 V

Predeﬁned levels ECL (-2V), SCFL (0V), LVPECL (1.3V), LVDS (1.25V), and CML (0V)

Transition times

20% to 80%

10% to 90%

< 20 ps

< 25 ps

Intrinsic jitter

9 ps pp typical with internal clock

Clock/data delay range ± 0.75 ns in 100 fs steps

Auto-calibration possible to compensate for temperature drifts

External termination voltage

- 2 V to +3 V

Crossing point Adjustable 20% to 80% typical to emulate duty cycle distortions

AUX data modes: • Sub-rate clock mode: can be used to generate lower rate reference clocks with divider factor

n = 2, 3, 4, 5, ... 128 relative to data rate. This is the same function as the sub-rate clock output of N4903A.

• Pattern and PRBS generation (Option 002). Can be used to drive a multiplexer such as N4876A

(requires SW 6.7 or later) and as independent second data channel (requires SW 7.0 or later).

Skew < 15 ps typical between data output and aux data output

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

Interface

Differential or single-ended, DC coupled, 50 Ω

Connector 2.4 mm female

1. At 10 Gb/s and 7 Gb/s

2. 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 termination voltage must be less than 3 V above VOL.

3. Unused outputs must be terminated with 50 Ω to GND.

4. At target BER 10

-9

, with PRBS 2

-1, 10 Gb/s

5. When Option D14 is enabled, and data rates are > 12.5 Gb/s: PJ1 + PJ2 range 0 to 2.0 UI, modulation frequency range 1 kHz to 100 MHz. RJ range 0 to 20 mUI rms

(0 to 280 mUI pp). For BUJ, functionality is not guaranteed and might require manual calibration. For data rates > 13.5 Gb/s SSC, SJ are disabled.

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 25 26

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Agilent Technologies J-BERT N4903B Manual de usuario Pagina 10

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