GS1528-CKA 데이터 시트보기 (PDF) - Gennum -> Semtech

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GS1528-CKA

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

Gennum -> Semtech 

GS1528

SDO

GS1528 Data Sheet

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.

16632 - 5 June 2005

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