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For example, I have two feedback TIAs (with photodiode connected). I want choose the one with large input current signal, and the shunt down the other.
So, I have to measure the average current through the TIA, by means of measure the received optical power.
Does anybody know how to perform...
Hi, all
I am designing a optical receiver with 2 Mbps.
However, I could not find an Clock and data recovery (CDR) in that speed, and also CDR consumes a lot of power.
Therefore, I am trying to find a clocked comparator to perform the function of the CDR, since the continues comparator will...
Hi, all
I am using Altera Cyclone lV to receive the "LVDS" data from a clock and data recovery (ADN2813)
Below is my schematic,.
what I did in the PFGA is, let the pin work as "LVDS" or "LVDS bus", like below:
I can successfully receive the data. see "y7" and "rx", they are exactly...
Hi, all
I am looking a fast LED for optical communication, the data rate is 50 Mbps.
So far, the fastest one I can see is SFH4501 with the rise/fall time of 10 ns.
So, my question is 1, can this LED be used for 50Mbps communication?
2, is there some faster LED...
Yes, usually, the bandwidth is 0.7 or 3/4 of the data rate. This is the trade off between ISI and noise.
If your bandwidth is 1/3 of the data rate, for example, 15GHz for 40Gbps. It still works.
I just want to know how does ISI do damage to the signal. this two books give a different answer.
could you plz give me a hint how to delete a thread in edaboard, I searched but could not find it.
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could balun deal with this very low input signal (small than 1mV) ?
Hi, all
Does anybody know how to play a single ended to differential conversion in the transimpedance amplifier ?
Just like the red circle in the Figure.
My input analog signal is 50MHz, amplitude is about very low, about 1mV.
So, should I use a balun or fully differential amplifier like...
Hi, all
I get a question for ISI ( inter symbol interference) in optical link.
In Razavi'S book,<design of integrated circuits for optical communications> P65, Fig4.2 (b)
It says that if the bandwidth of the receiver is 1/4 of the data rate, then voltage decrease due to ISI is roughly...
Hi, all
I am designing a TIA like this,
It is single ended, therefore, I think I need a single end to differential amplifier and then connect to the limiting amplifier (differential input). see red circle in the following figure.
Does anybody have a suggestion for this amplifier...
Hi, all
Does anybody know when the photodiode datasheet says, a photodiode has a rise time of, i.e, 5ns.
It means "transit time is 5ns" or " together with the RC network (50ohm load)", the whole rise time is 5ns?
Thanks in advance
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