The Designer's Guide Community Forum

The Designer's Guide Community Forum
https://designers-guide.org/forum/YaBB.pl
Design >> Analog Design >> pole zero analysis of bandgap voltage reference
https://designers-guide.org/forum/YaBB.pl?num=1256284691

Message started by vamshikrishna on Oct 23^rd, 2009, 12:58am

Title: pole zero analysis of bandgap voltage reference
Post by vamshikrishna on Oct 23^rd, 2009, 12:58am

Can someone tell how to estimate the pole zero in the bandgap circuit (2)shown here. Please point me to any references dealing with stability analysis of bandgap circuits (pole zero estimation)

I dont understand the need/advantage of using the additional resistors r1 and r3 in the fig (2)
In fig (2) can we also take the o/p reference at the other end (above resistor r1)? If so which one is better ?

Thanks,
vamshi

Title: Re: pole zero analysis of bandgap voltage reference
Post by raja.cedt on Nov 5^th, 2009, 6:32am

hi,
R1 mainly to reduce systemic offset in current mirrors
R3 is to adjust op amp common mode voltage, please refer this pap '' Design Considerations of Recent Advanced Low-Voltage

Low-Temperature-Coefficient CMOS Bandgap Voltage Reference''

Thanks,
Rajasekhar.