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基架的訊號調節技術
- Q: CML 可以用預加重驅動很長的基架嗎?
- A: pre/de-emphasis can enhance signal quality. But it depend on the frequency of signal to drive the longer signal line also.
- Q: My system datarate is about 1Gbps and I have a backplane of about 6 inch long, shall I use signal conditioning devices?
- A: it depeneds on the pcb layout, quality of the connector, the driving capability of the device and the system BER requirement. The best way to estimate is simulation.
- Q: 當我要處理差分信號時,對於使用coupling有點不知所措,為什麼有時需要AC-couple?
- A: There are several factors determine which coupling method is appropriate. First of all, if your serialized data is DC-balance in nature, it doesn't matter which coupling methods is being used. If you data is, however, not DC-balance, you'd better use DC-c
- Q: LVDS 可以用去加重嗎?
- A: Possible. But pls be reminded that the receiver threshold is 100mV and the typical VOD of LVDS is 350mV. Too much de-emphasis may violate the receiver threshold requirement
- Q: If pre-emphasis or de-emphasis is able to open the eye, why do we need EQ?
- A: Pre/de-emphasis and equalization can be used separately or in conjunction to compensate for media loss. If used only pre-emphasis or de-emphasis and signal is OK, it does not need EQ also.
- Q: Can you tell me how to calculate the microstrip line impedance?
- A: 可以透過PCB板廠來量測microstrip line impedance
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