Quantum Data 802R-PCI User Manual download pdf (Page 16)

Page 29

The effect of oscilloscope bandwidth

Tr = 77.2ps

Tf = 76.8ps

Tr = 83.0ps

Tf = 83.6ps

Tr = 96.0ps

Tf = 96.5ps

8GHz BW

6GHz BW

4GHz BW

1080p 8bit (1.485Gb/s) case

• Even the waveforms with

1.485Gb/s and less rise time

signals need 8GHz

bandwidth

• In HDMI, minimum Tr/Tf

value is specified to be 75ps.

Recently, there is some case

that IC transmitting signals

at high speed is designed

with limit value

• In this case, 4GHz bandwidth

provides correct waveform,

and Tr/Tf can’t be measured

Tr/Tf (20-80%)

measurement

result

Page 30

The bandwidth can be expanded when matched

with transfer rate

HDMI = Measurable

HDMI = Measurable

transfer rate

transfer rate

Optimize

Optimize

ROI

ROI

!

!

Gigabit/s

2.0

1.0

480p

3.0

1995 2000 2005

720p/1080i

740Mbps

1080p

1.485Gbps

4GHz

DSO80404B 4GHz

1080p 12bit

4.0

8GHz

DSO80804B 8GHz

??

2.2275 Gbps

4.5 Gbps(?)

???

13GHz

DSO81304B 13GHz

You can also choose to

reduce bandwidth (Noise

reduction option)

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