Floating Current Source [hlp]

[april1975]

Hello
I want to know about Floating Current Source. It seems that this topic has appeared in this paper for the first time:

Output stage for current-mode feedback amplifiers, theory and applications
by: Arbel & Goldminz, 1992

But I can'access to this paper. Can anyone help me? Is there any other source for learning about this topic?
Thnx

 

[erikl]

See this example:

Or search for "Monticelli biasing". Also, this IEEE paper
"A Compact Power-Efficient 3 V CMOS Rail-to-Rail Input/Output Operational Amplifier for VLSI Cell Libraries" by Ron Hogervorst et al. explains it quite well.

 

[april1975]

Hello erikl
Your answer is useful. But can you explain about the floating current source configuration? I want to see equations of it. Have you ever seen such equations in the texts?
thnx

 

[erikl]

can you explain about the floating current source configuration?

I'd think Monticelli's original paper (s. the 1^st PDF below) and the above given Hogervorst paper describe it well.

I want to see equations of it. Have you ever seen such equations in the texts?

I found two university tutorials with some equations on this biasing scheme:

View attachment Monticelli_Class-AB_biasing_scheme.pdf from **broken link removed**, and
View attachment EE214_Advanced_Analog_IC_Design-course_Murmann.pdf, slides 13-16 . HTH!