DS160PR410: VOD and DC gain

fred cheng

Prodigy 140 points

Part Number: DS160PR410
Other Parts Discussed in Thread: DS320PR810

Hi team,

I know VOD is related to voltage swing, should it be as large as possible?

and what's the relationship between VOD and DC gain?

over 3 years ago

0 Nasser Mohammadi over 3 years ago

TI__Guru* 93670 points

Greetings,

DC gain mainly boosts low frequency content of the data pattern. So you should see an increase in "1" or "0" level as you increase DC gain.

Regards,,Nasser

0 fred cheng over 3 years ago in reply to Nasser Mohammadi

Prodigy 140 points

Hi Nasser,

how about VOD, would you explain more on this one?

0 Nasser Mohammadi over 3 years ago in reply to fred cheng

TI__Guru* 93670 points

Hi Fred,

DC gain sets the VOD or DC level of the signal. Please note we recommend using 0dB DC gain. This prevents any over-equalization of the signal. In cases, where we have very high loss on input of the device, DC gain can be increased. In all cases we have used, we did not need to change DC gain and it was always set at 0dB.

Regards,, Nasser

0 fred cheng over 3 years ago

Prodigy 140 points

Hi Nasser,

If VOD refer to the voltage swing of the signal, why would DC gain affect it?

I thought DC gain only affect the linearity

thanks

0 Nasser Mohammadi over 3 years ago in reply to fred cheng

TI__Guru* 93670 points

Hi Fred,

DC gain is the outside boundary of the eye diagram. This is mainly when we have long string of zero or one - hence DC gain. There are two types of linearity: DC and AC linearity. AC linearity is very important and more difficult to achieve than DC linearity. Please refer to the DS320PR810 evaluation result on secured folder for more information.

Regards,,Nasser

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DS160PR410: VOD and DC gain