diego.fan
Member level 3
Hi, all
I have a question need your help. Thanks in advance. I want to design a current source(CS) with the below requirement in 180nM.
1. Voltage control and current have the linear relationship.
2. Current mirror can supply enough current. It means if I let MOS W/L low enough to let CS work in triode region, it can has linear V-I. But it's very difficult to supply enough current. So that I have to use many CS in parallel (maybe 10 in parallel)which occupies a lot of area. I don't like to use this way.
3. Add a resistor in source node: source degenerator. I think it can make V-I more linear, but current will be lower, right?
May I ask if there is other circuit structures or methods which can realize linear V-I and enough current at the same time?
Regards
I have a question need your help. Thanks in advance. I want to design a current source(CS) with the below requirement in 180nM.
1. Voltage control and current have the linear relationship.
2. Current mirror can supply enough current. It means if I let MOS W/L low enough to let CS work in triode region, it can has linear V-I. But it's very difficult to supply enough current. So that I have to use many CS in parallel (maybe 10 in parallel)which occupies a lot of area. I don't like to use this way.
3. Add a resistor in source node: source degenerator. I think it can make V-I more linear, but current will be lower, right?
May I ask if there is other circuit structures or methods which can realize linear V-I and enough current at the same time?
Regards