Jan 24, 2008 #1 J jeff_zx Member level 1 Joined Dec 8, 2005 Messages 34 Helped 3 Reputation 6 Reaction score 1 Trophy points 1,288 Activity points 1,486 3uA is proper? Thanks
Jan 24, 2008 #2 jluhzw Member level 5 Joined Nov 15, 2004 Messages 94 Helped 17 Reputation 34 Reaction score 4 Trophy points 1,288 Location Hangzhou China Activity points 756 Generally, 3uA is OK. If the pnp bipolar is used, the main point is making the bipolar working in the region that its beta is constant when your current changes.
Generally, 3uA is OK. If the pnp bipolar is used, the main point is making the bipolar working in the region that its beta is constant when your current changes.
Jan 27, 2008 #3 leo_o2 Advanced Member level 4 Joined Sep 3, 2004 Messages 1,322 Helped 278 Reputation 558 Reaction score 241 Trophy points 1,343 Location China Activity points 5,761 How low current can be used for the diode current in BG?
Jan 29, 2008 #4 W WindRay Member level 1 Joined Nov 7, 2007 Messages 38 Helped 4 Reputation 8 Reaction score 2 Trophy points 1,288 Location sg Activity points 1,546 Also remember that the dVbe/dT is a function of current. Any changes in the current will effect the temperature of the bandgap. Added after 44 seconds: Any changes in the current will effect the temperature coefficent of the bandgap.
Also remember that the dVbe/dT is a function of current. Any changes in the current will effect the temperature of the bandgap. Added after 44 seconds: Any changes in the current will effect the temperature coefficent of the bandgap.
Jan 30, 2008 #5 Y yibinhsieh Full Member level 4 Joined Apr 25, 2005 Messages 194 Helped 19 Reputation 38 Reaction score 5 Trophy points 1,298 Activity points 2,845 First, you need to decide which PNP you use (5X5, 10X10). These two PNPs are usually used. Second, you simulation IV curve based diode connection (base and collector are connect to ground). Find the flat region. Usually, few uA to few 10uA are Ok.
First, you need to decide which PNP you use (5X5, 10X10). These two PNPs are usually used. Second, you simulation IV curve based diode connection (base and collector are connect to ground). Find the flat region. Usually, few uA to few 10uA are Ok.