How to simulate "input bias current" & "i

[holddreams]

1.What's the meaning of " input bias current" for a comparator?

What's the meaning of " input offset current" for a comparator?

2.How to simulate these two parameters?

Thanks.

 

[marshel]

I think this is for the bjt input stage.
For bipolar transistor, the base of the transistor has the current flow and if input stage has offset, the base current may be different of the two diffential input transistor.

 

[holddreams]

Re: How to simulate "input bias current" & &am

For bjt transistor:
Ip-----Positive input base current
In-----negative input base current

(Ip+In)/2=input bias current
Ip-In=input offset current

And for CMOS transistor,Ip ,In stand for input gate current.


The above is what I have searched this morning.

 

[starcoming]

Hi, it seems no current flows into MOS gate.

 

[huojinsi]

Re: How to simulate "input bias current" & &am

1. The input bias current means current of flowing into the base (for NPN) or out
the base (for PNP).
2. The offset current means the difference of base current for input stage two
opposite transistor.
3. The input bias current can simulate.Print the operating point of input transistor
and get the bias current value when simulating.
4. The input offset current cann't simulate.Because under the condition of ideal
simulating,the input opposite is symmetric ,and the input offset current is zero.