raja.cedt wrote on Nov 27th, 2009, 11:12pm:hi Yawei,
ya it's correct, but you cann't say that n1 is sinal ground because i feel we have to say that it should be represented by it's small signal equivalent (dynamic resistance)..but you are correct compared to n1 n2 should be high impedance node.
@loose-electron: i did't understand why you are saying that it's single loop..because wht i feel you are feedback to both terminals of the opamp.
Thanks,
Rajasekhar.
hello
i dont quite understand why n2 is high impedance node.
Can someone help me understand how we decide which input of the op-amp to connect to the bandgap circuit.
is it because the impedance seen is (R1+R2)/(R1+R2+R3), compared to the impedance seen at n1 R1/R2. Assuming all have the same impedance.
So high impedance = high gain, is that why it is tied to the inverting input.