angbong
Newbie level 6
Suppose OP-Amp is ideal and equivalent circuit of OP-amp is (a).
in case differential input is zero, output DC+AC level is zero. (a)
but real OP-Amp looks like (c), (d) and their output DC level is not zero.
1. in circuit (c) DC level of Vout is A = V(Iss)+Vov2+Vov4
2. in circuit (b) i think that Vref(also output of OP-Amp) should be B = V(R1)+Vbe2.
and if that OP-amp is made by (c), Vref should be V(Iss)+Vov2+Vov4 also.
What value is correct?
3. When i learning OP-Amp in a real circuit level, i thought OP-Amp operates in a small signal aspect.
(Output DC level is not concerned, only output small signal is important)
But when i learning OP-Amp as a black box(a), i thought OP-Amp is not a small signal amp.
What is correct?
in case differential input is zero, output DC+AC level is zero. (a)
but real OP-Amp looks like (c), (d) and their output DC level is not zero.
1. in circuit (c) DC level of Vout is A = V(Iss)+Vov2+Vov4
2. in circuit (b) i think that Vref(also output of OP-Amp) should be B = V(R1)+Vbe2.
and if that OP-amp is made by (c), Vref should be V(Iss)+Vov2+Vov4 also.
What value is correct?
3. When i learning OP-Amp in a real circuit level, i thought OP-Amp operates in a small signal aspect.
(Output DC level is not concerned, only output small signal is important)
But when i learning OP-Amp as a black box(a), i thought OP-Amp is not a small signal amp.
What is correct?