Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

ICMR--- is it need to test the current of the MOS(TAIL)

Status
Not open for further replies.

poweric

Member level 5
Joined
Oct 29, 2006
Messages
80
Helped
3
Reputation
6
Reaction score
0
Trophy points
1,286
Activity points
1,733
i want to know
when i want to test the ICMR , it need to connet the 1_gain structions
when the VIN arise measure the VOUT in the linear regions
is it also to measure the I(TAIL) make sure it opeartion in the saturation region??????
 

raduga_in

Full Member level 4
Joined
Aug 29, 2005
Messages
200
Helped
31
Reputation
66
Reaction score
10
Trophy points
1,298
Location
India's Silicon Vally
Activity points
2,359
I hope your case is of simple NMOS source coupled pair .
Here, the minimum value ICMR decides at least the turning ON of the source couped transistors and maintain the
required headroom for the tail current source transistor ..
 

poweric

Member level 5
Joined
Oct 29, 2006
Messages
80
Helped
3
Reputation
6
Reaction score
0
Trophy points
1,286
Activity points
1,733
how i think of the headroom as your mentions
when it is enough to drive the input PMOS into SAT if the MOS of tail current is liner region as the curren source
the case can be condsider the ICMR region??
 

hung_wai_ming@hotmail.com

Full Member level 6
Joined
Jan 5, 2004
Messages
383
Helped
52
Reputation
104
Reaction score
11
Trophy points
1,298
Activity points
2,464
The point at which tail current drops from the flat line during both input voltage tied at one point and changes its input voltage, is where the point min ICMR is, for a typical NMOS sourced coupled pair op-amp
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top