Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics 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.

what the advantage of this compare??

Status
Not open for further replies.

poweric

Member level 5
Member level 5
Joined
Oct 29, 2006
Messages
80
Helped
3
Reputation
6
Reaction score
0
Trophy points
1,286
Activity points
1,733
what function of the cross PMOS??

is it only for improve gain????




thank you for help
 

for hysteresis
 

    poweric

    Points: 2
    Helpful Answer Positive Rating
Fom said:
for hysteresis

i want to find the original paper of this circuit for the communion meeting
can you give some help???
 

I feel - by sense you are correct, this is to increase gain. Actually, it is in +ve feed-back configuration and if you can break their latched state (which the previous post called as hysteresys), it will go to the other direction for any any error signal. This is what is required in comparator. For a Gain of "A", which is constant, you will find some error voltage when the output fall sort of rail. For this positivge feed-back configuration, you will get an output always at rail voltage.
 

sankudey said:
I feel - by sense you are correct, this is to increase gain. Actually, it is in +ve feed-back configuration and if you can break their latched state (which the previous post called as hysteresys), it will go to the other direction for any any error signal. This is what is required in comparator. For a Gain of "A", which is constant, you will find some error voltage when the output fall sort of rail. For this positivge feed-back configuration, you will get an output always at rail voltage.


is it only for gain-enhance/?
can it increase the gaindb or slewrate while compared with the symmetrical op???
 

the main function of cross pmos is to generate hysterisis. due to the diode pmos clamp the output swing, the cross pmos is also to increase the gain to enhance the speed. in the meanwhile, the cross pmos adds another current to bias the differential pais input nmos in order to increase the Gm. so the unity gain bandwidth can be increased. and the slew rate is determined by the tail current, so there is no effect in slew rate.
 

    poweric

    Points: 2
    Helpful Answer Positive Rating
Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top