Need example - bias current in CMOS integrated circuit

[kickbeer]

bias current

can someone show me the example of calculation to determine bias current in CMOS integrated circuit?

 

[oermens]

bias current

your question is beyond vague... what circuit in particular? opamp? lna? oscillator? SCL logic? what are your requirements and constraints? what process are you using? etc..

 

[kickbeer]

Re: bias current

your question is beyond vague... what circuit in particular? opamp? lna? oscillator? SCL logic? what are your requirements and constraints? what process are you using? etc..

hi oermens,

the circuit is comparator.See the the circuit in the attachment. How to determine the vbias? the process technology is 0.35um with 3.3 V supply voltage.

 

[kickbeer]

Re: bias current

hello oermens,

sorry last time i forgot to attach the comparator diagram. you can see again from the previous message

 

[Blackuni]

Re: bias current

Hi,

Id (M8 ) = Id(M9a) + Id(M9b)

so vbias = Vgs value which gives Id(M8 ) considering the effects of Vds8

Practically u can find this Vgs value by plotting V-I curve for M8

you can refer to any books on Analog CMOS design.

Hope this helps.

Thanks,

 

[kickbeer]

Re: bias current

Hi,

Id (M8 ) = Id(M9a) + Id(M9b)

so vbias = Vgs value which gives Id(M8 ) considering the effects of Vds8

Practically u can find this Vgs value by plotting V-I curve for M8

you can refer to any books on Analog CMOS design.

Hope this helps.

Thanks,

thx blackuni,

small question. Id(M9a) + Id(M9b) depends on Id(M8). Am i right? if we change Vbias, that means, we change Id of M9. Please correct me if necessary.

 

[cougar168]

bias current

Just run the simulation, it can tell you the voltage/current at each node