bias current generator (low voltage, low tempco) - question

Status
Not open for further replies.
C

cmos_ajay

Full Member level 2
Joined
Jan 30, 2007
Messages
126
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,296
Activity points
2,247
Hello,
I need a bias current generator whose ouput current (ZTAT) is typically 200nA.
The desired temperature co-efficient is 250 ppm/degree Celcius
Supply voltage VDD = 1.3 volt
Temperature: -40 to +125 degree celcius
Any ideas or schematic for this bias current generator ??
Regards.
 

Well I would recommend google - there is tons of stuff about this, Like the one attached. What I did not like is Idd. So I made my own @ 3uA which works @1.2V but can not share. Sorry.
 

Attachments

  • 1_volt_high_psrr_cmos_bandgap_voltage_reference.pdf
    260.3 KB · Views: 150


A simple way:
a deplete NMOS + a enhanced NMOS.
 

Hello, I will also recommend reading 'A CMOS subbandgap reference circuit with 1-v power supply voltage' by J. Doyle .....
I used the bandgap voltage and gave it to a V-to-I converter to obtain a i(ztat)
I tried the recommended circuit , but the i(ztat) was 900 ppm/degreeC and I needed only 250 ppm/degreeC
 

If necessary, some curvature compensation can be introduced for you BG circuit.
 

Many Japanese IC companies use this structure to design voltage reference and achieve +/-100ppm TC for LDO products.
leo_o2 said:

A simple way:
a deplete NMOS + a enhanced NMOS.
Click to expand...
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…