How to generate 4 bias voltage?

[holddreams]

How to generate 4 bias voltage?
Use bandgap ?
Any related papers to share?

Thanks.

 

[nxing]

What's the meaning of "4 bias voltages"? Do you mean four independent voltages? if it is, you can just use regulator or bandgap.

 

[palosian]

baisd voltages for a transistors ?

 

[holddreams]

What's the meaning of "4 bias voltages"? Do you mean four independent voltages? if it is, you can just use regulator or bandgap.

hi,
I want to design a circuit which can generate four diffenrent voltage,for example V1,V2,V3,V4.
Do you have any paper about this?
Thanks.

 

[vbhupendra]

use one bandgap and then utilize it for generating ur 4 bias voltages (cascoding etc techniques)

 

[ambreesh]

Hi holddreams,

Are these bias voltages used as reference in your system, if yes. Then buffer the BGR output and source a current through a resistor ladder, get your references.

If no, then please elaborate on what are they used for, what accuracy do you need in them?

 

[holddreams]

Hi holddreams,

Are these bias voltages used as reference in your system, if yes. Then buffer the BGR output and source a current through a resistor ladder, get your references.

quote]

yes, i want it that way.
Can you send me a paper about this?
Or can you draw a configure as you said?
Thanks.

Also another question, if use a resistor ladder,does the temperature have a little effect on the whole circuit?

 

[mpig09]

Dear holddreams :

Pls reference it.

Best Regards,
mpig

 

[sandip_micro]

I think Martins book is having a ckt which shows the cascode bias volatge generations and tail curent bias generationjs voltages

 

[srieda]

Use BGR to generate a stable voltage. Convert it to current. then use current mirrors to get any proportional current you need....

 

[dwayne22]

The paper provided is not a good example. There is no start-up circuit, and the schematic is wrong. (NMOS and PMOS symbols incorrect). I wouldn't trust it...

 

[standup]

you can get a Vref about 1.2V with a bandgap reference,then using the amplifier you can get more voltage which are steady as the Vref
you can get the different voltages:
vout=(R1+R2)/R2*Va≈(R1+R2)/R2*Vin

 

[s_babayan]

Dear friend,

You can use one independent current source, and make your required voltages using current mirrors. Good Luck

 

[waxtomato]

I guess these 4 bias voltages are for opamp bias, using replica method, you can get them without consider voltage.