Transistor in same ratio (100/2 & 50/1), what is the differe

S

smartchi

Guest
Dear all,

I am sorry to ask this question again. Actually, I have seen it before
in this newsgroup. However, I could not find out it in this newsgroup.
Could anyone answer this question again?

As I remember that the 100/2 transistor with larger parasitic capacitor
than the 50/1 transistor. How about any other different?

Best Regards,

Charles CHENG
 
smartchi wrote:

Dear all,

I am sorry to ask this question again. Actually, I have seen it before
in this newsgroup. However, I could not find out it in this newsgroup.
Could anyone answer this question again?

As I remember that the 100/2 transistor with larger parasitic capacitor
than the 50/1 transistor. How about any other different?

Best Regards,

Charles CHENG
Click to expand...
It will also affect the noise the transistor contributed to the circuit.
 
Hi, Charles:

1. smaller gds
2. better matching eg. in current mirror
3. many other differences if u consider second order effects. u can
find the details in many analog ic design book.


Xiaofeng

smartchi <smartchi@hotmail.com> wrote in message news:<bvnnj6$2v72$1@justice.itsc.cuhk.edu.hk>...
Dear all,

I am sorry to ask this question again. Actually, I have seen it before
in this newsgroup. However, I could not find out it in this newsgroup.
Could anyone answer this question again?

As I remember that the 100/2 transistor with larger parasitic capacitor
than the 50/1 transistor. How about any other different?

Best Regards,

Charles CHENG
Click to expand...
 
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