Agilent Technologies N5980A Uživatelský manuál stáhnout pdf (Strana 13)

Serial BERT N4906B, Data Sheet V3

The serial BERT N4906B is able to align the sam-

pling point’s voltage threshold and time offset. It

is possible to automatically align the threshold and

offset together or each separately.

Automatic Alignment

Automatic center (auto align)

The error detector sets the 0/1 threshold midway

between the top and bottom of the eye, where the

bit error ratio is equal to a selectable threshold.

The eye height is calculated and displayed. It is

limited to a 2 V window selected by the user. Also

it recognizes a pattern inversion.

Automatic clock to data alignment (data center)

An important feature of the serial BERT N4906B

error detector is the ability to automatically align

the clock and data inputs. The sampling point will

be positioned in the middle of the eye (time axis).

Automatic threshold (0/1 threshold center)

The error detector centers the 0/1 threshold level

automatically. If singled ended measurements are

done, the error detector is able to continuously

track the mean DC level of the input signal and

adjust the threshold accordingly. The adjustment

interval is 100 ms. The tracking is limited to a 2 V

window selected by the user.

Figure 21: Automatic 0/1 threshold center search

Figure 20: Clock-data sampling point search

Figure 19: Automatic center

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72770 Reutlingen

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Tel. 07121 / 51 50 50

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Fax 07121 / 51 50 10

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info@datatec.de

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www.datatec.de

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Agilent Technologies N5980A Uživatelský manuál Strana 13