What are the specifications of opamp design for bandgap?

[icx]

Re: opamp design for bandgap

I suggest you check the unity gain bandwidth. If the feedback is not fast enough. The bandgap will oscillate.

How much should the unity gain bandwidth be?
thanks.

 

[holddreams]

Re: opamp design for bandgap

(1)how much the “low offset drift” should be?

(2)And what about the input offset voltage? 1mv?5mv?and others?

(3)how to consider noise? add some noise on the vdd? or add a inductor such as 5n to the opamp power supply?

(4)what about the slew rate of the opamp used in bandgap?10v/us? or others?

 

[sorata]

Re: opamp design for bandgap

high gain>70db , phase margin>65C ,and bandwidth<10~20K over your interested temperature .
hope it helps.

 

[jinxingsun]

opamp design for bandgap

open loop gain ,stability, noise and input offset voltage.

 

[pillar_chen]

opamp design for bandgap

low offset opamp and high gain OTA

 

[bharatsmile2007]

Re: opamp design for bandgap

bsrivastava Posted: 26 Nov 2005 10:17 Post subject: Re: opamp design for bandgap

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ICMR of the op-amp should be close to the cutin voltage of the p-n junction diode.


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According to bsrivastava,the ICMR of the op-amp should be close to the cutin voltage of the p-n junction diode?

Would any one explain,if ICMR is less than the cutin voltage of the p-n junction diode,what would be the problem?

Thanks