DS25CP102: Equalizer Response

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Hi,

Unfortunately these equalizers were designed a long time ago.  I do not have the original design information on the equalizer performance.

Here is a graphic which shows the frequency response.

Regards,

Lee

Not sure the picture came through.  Here it is again for the 3/6/9 dB settings.

Regards,

Lee

Hi,
Thanks for the answer.

These curves don't seem to be from the DS25CP102.

From your SNLA115A–April 2009–Revised April 2013, I've the following information:

There is only one EQ level (and the OFF state).

Moreover, I assume that the low frequencies gain should be near 0dB

Regards,

Only the light purple curve is available in the DS25CP102.

The low frequency gain is indeed flat.  In the graphic the equalization curves are also showing a large voltage gain through the device.  This is expected since the output drive is essentially a limiting amplifier.  So the small signal input was output with significant voltage gain at all frequencies.

Regards,

Lee

Hello,
Sorry for the late answer.

OK, so if I understand, your curves are the caracteristics of the whole  component (from the input to the output with Pre-emphasis OFF).

I need to simulate the EQ stage to analyze the eye diagram between the EQ stage output and the 2x2 matrix input.

I assume that the first stage of the DS25CP102 is a CTLE equalizer.
So If I offset the purple curve to 0dB (@ LF), is it correct to extract the pole values and zero value of the EQ stage? (inspired by your Application note SLYT629)

Regards