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Vdd and Vcc in a same circuit

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dra66ard

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hi, i m designing a circuit where my input stage require only 1.2V for the Vdd but my output stage require 5V for the Vdd. Therefore, i need to use 2 different Vdd value for my circuit. I would like to ask whether can I use Vdd = 1.2V for the input stage circuit and Vcc = 5V for the output stage circuit ?

additional info: i would need to design the layout too for this circuit

Thank you in advance friends
 

dra66ard said:
I would like to ask whether can I use
Vdd = 1.2V for the input stage circuit
and Vcc = 5V for the output stage circuit ?
Click to expand...
Yes, you can.

However you have to consider following.
- Surge Protection
- ESD Protection
- Ramp Up Conditions for Vdd=1.2V and Vcc=5V
 

Vdd and Vcc are just names for the supplies, if they are both 5V and the supplies are present at the right times, you can treat them as one supply.

Brian.
 

2 different Vdd value in a circuit

hi, i m using mentor graphic for my circuit design. I m designing a rail to rail op amp. i need to supply 1.2v vdd to my complementary differential circuit while i need to supply 5v of vdd for my class ab amplifier becoz it consisted of 6 transitor, therefore it required 0.4x6=2.4v as i m using 0.13um technology. how do i connect my 5v Vdd? Thank you
 

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