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GS1528

HD-LINX II Multi-Rate SDI Dual Slew-Rate Cable Driver

Gennum -> Semtech 

GS1528

SDO

SDO

Figure 3-3: Static Protection Diodes

3.4 Output Return Loss Measurement

To perform a practical return loss measurement, it is necessary to force the GS1528

output to a DC high or low condition. The actual measured return loss will be based on

the outputs being static at VCC or VCC-1.6V. Under normal operating conditions the

outputs of the GS1528 swing between VCC-0.4V and VCC-1.2V, so the measured value of

return loss will not represent the actual operating return loss.

A simple method of calculating the values of actual operating return loss is to interpolate

the two return loss measurements. In this way, the values of return loss are estimated at

VCC-0.4V and VCC-1.2V based on the measurements at VCC and VCC-1.6V.

The two values of return loss (high and low) will typically differ by several decibels. If

the measured return loss is RH for logic high and RL for logic low, then the two values can

be interpolated as follows:

RIH = RH - (RH-RL)/4 and

RIL = RL + (RH-RL)/4

Where RIH is the interpolated logic high value and RIL is the interpolated logic low value.

For example: if RH = -18dB and RL = -14dB, then the interpolated values are RIH = -17dB

and RIL = -15dB.

GS1528 HD-LINX II Multi-Rate SDI Dual Slew-Rate

Cable Driver

Data Sheet

16632 - 9

August 2010

9 of 13

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