Other Parts Discussed in Thread: TL431, LM4040
Hello all
I am going to design a motor phase current sampling circuit with AMC1200.
Q1: We know output signal of AMC1200 needs to be conditioned by op amp.Usually need a reference source to the input of the op amp.
So could you help me to confirm one thing :If I use TL431 as a reference source to connecte the input of the op amp and no voltage follower in the middle,then does it cause impedance matching problems?May I handle it in this way?
Q2:I found some input filter circuit has no resistor on VIN- pin. What is the difference between these two filters? What impact will it have?
Q3:How to connect the two signals VIN- and GND1(They are the same electrical net UHE_2 on my schematic).Can these two pins be connected with copper directly? What issues need to be considered about PCB layout ?
Looking forward to your help,Thanks