weak_inversion
Newbie level 2
I want to design a transmitter which is compliant with JESD204B standard electrical specifications and transmitter differential voltage is defined as min 360mV, max 770mV peak-to-peak differential "into floating 100 ohm load".
The problem is that, the output impedance of the transmitter is differential 100 ohm and also the input impedance of the receiver should be differential 100 ohm nominally. If this "floating 100 ohm" that is mentioned in the specifications is the internal resistance that is intentionally placed inside of the transmitter, when we add the input impedance of the receiver the swing will be halved. The second option is that, "floating 100 ohm load" is the input impedance of the receiver and differential voltage that is defined the specifications is the swing at the input of the receiver. Which one is correct?
In other words, in transmitter eye mask, do they measure the voltage levels between the terminals of the receiver, or only between the transmitter outputs without loading it with receiver?
Thanks in advance :thumbsup:
The problem is that, the output impedance of the transmitter is differential 100 ohm and also the input impedance of the receiver should be differential 100 ohm nominally. If this "floating 100 ohm" that is mentioned in the specifications is the internal resistance that is intentionally placed inside of the transmitter, when we add the input impedance of the receiver the swing will be halved. The second option is that, "floating 100 ohm load" is the input impedance of the receiver and differential voltage that is defined the specifications is the swing at the input of the receiver. Which one is correct?
In other words, in transmitter eye mask, do they measure the voltage levels between the terminals of the receiver, or only between the transmitter outputs without loading it with receiver?
Thanks in advance :thumbsup: