# how to find bias so that OP amp output range is max?

Discussion in 'Electronics Homework Help' started by only6512, Jun 8, 2014.

1. ### only6512

18
0
Feb 15, 2014
hello,everyone , i have a question about (d) i just know that maxium output may be V_Bp2+|Vov7| mininum:V_BN2-v_ov9 can anyone help me? thanks ^^

*by the way ,i want to check the answer to (c) my answer:max:5-|V_ov4|+V_t1;min:-5+|V_ov3|+|V_ov1|+V_t1 are my answers right? thans again^^

#### Attached Files:

• ###### 31.jpg
File size:
40.8 KB
Views:
130

5,164
1,081
Dec 18, 2013
Can you explain What V_0V4 and V_t1 is. I would have thought for the max you should be taking away all relevant voltage and not adding them as in -V_t1 and not +V_t1? What are these voltages?

5,164
1,081
Dec 18, 2013
Ah just figured your Vt1 is what is called VTN and is the threshold voltage. I am not sure but I think it should be this
Max = VDD-VSD4+VTN and Min = VSS+VSD3+VGS1

4. ### only6512

18
0
Feb 15, 2014
V_ov4 is the overdrive voltage of mosfet 4
V_t1 is the threshold voltage of mosfet 1
Max = VDD-VSD4+VTN and Min = VSS+VSD3+VGS1
I think it is the same as mine:
5-|V_ov4|+V_t1;min:-5+|V_ov3|+|V_ov1|+V_t1