filipecbv
Newbie level 6
Hi,
I'm designing a SC sigma delta modulator (Fs=5MHz) with 5V supply, and I need 2 reference voltages (1.75 and 3.25V) generated into the chip. So, I think that the best way is to build a BGR (such as PTAT, razavi pg 391, fig 11.20) , and with it, generate the other voltages. Is this a good approach??? Which circuit should I use to derive the 2 required voltages??
And what kind of buffer is required after the references generated??
Please, enlight me!!
Thanks
I'm designing a SC sigma delta modulator (Fs=5MHz) with 5V supply, and I need 2 reference voltages (1.75 and 3.25V) generated into the chip. So, I think that the best way is to build a BGR (such as PTAT, razavi pg 391, fig 11.20) , and with it, generate the other voltages. Is this a good approach??? Which circuit should I use to derive the 2 required voltages??
And what kind of buffer is required after the references generated??
Please, enlight me!!
Thanks