Hi! I want to measure the offset voltage of an opamp. First, I configure the opamp in an unity gain buffer and measure the output. The offset voltage is 64.16uV. Then, I applied this voltage to the non- inverting input of the opamp. When I simulate it again, instead of getting 0V at the output, I get 464.29mV. Is the setup correct? Is the offset voltage of 64.16uV correct? Looks a bit small for an opamp.
Thanks. Amy
- Schematics Netlist *
I_I1 0 $N_0001 DC 100u M_M1 $N_0002 $N_0002 $N_0003 $N_0003 Mbreakp
- L=1u
- W=50u M_M2 $N_0004 $N_0002 $N_0003 $N_0003 Mbreakp
- L=1u
- W=50u M_M6 $N_0001 $N_0001 $N_0005 $N_0005 MbreakN-X2
- L=1u
- W=10u V_V1 $N_0003 0 5V V_V2 0 $N_0005 5V R_R1 $N_0007 $N_0006 12.245k M_M8 $N_0006 $N_0004 $N_0003 $N_0003 MbreakP
- L=1u
- W=100u M_M14 $N_0003 $N_0006 VOUT VOUT MbreakN-X7
- L=1u
- W=10u M_M7 $N_0007 $N_0001 $N_0005 $N_0005 MbreakN-X4
- L=1u
- W=20u M_M5 $N_0008 $N_0001 $N_0005 $N_0005 MbreakN-X3
- L=1u
- W=20u M_M15 $N_0005 $N_0007 VOUT VOUT MbreakP
- L=1u
- W=25u M_M4 $N_0004 $N_0009 $N_0008 $N_0008 MbreakN
- L=1u
- W=20u M_M3 $N_0002 $N_0010 $N_0008 $N_0008 MbreakN
- L=1u
- W=20u V_V8 $N_0010 0 0V V_V9 $N_0009 $N_0010 -64.16u