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a input rail-to-rail opamp design (Read 3500 times)

Stone.M

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China

a input rail-to-rail opamp design
Nov 15^th, 2010, 4:32am

Hi guys,

I need to design a input rail-to-rail opamp, here is the spec:
1.Rail-to-Rail Input and Output;
2.Gain Bandwidth Product: 1.2MHz
3.7.5mV Typical VOS
4.Operates on 2.0 V to 5.5 V Supplies
5.Input Voltage Range: -0.1 V to +5.6 V with VCC = 5.5 V
6.Low Supply Current: 50μA

Can anyone pls give me some advice or some references? Thank you.

Regards

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ontheverge Junior Member Offline Posts: 31	Re: a input rail-to-rail opamp design Reply #1 - Nov 16^th, 2010, 4:38am technology?
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raja.cedt Senior Fellow Offline Posts: 1516 Germany	Re: a input rail-to-rail opamp design Reply #2 - Nov 16^th, 2010, 5:14am hi, you have huge supply man, so start with folded cascode with nmos and pmos input stages and proceed, if you need constant gm across full Input common mode range then go for complicated circuits. You can simple circuit for the specs in razaavi it self. Thanks.
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loose-electron Senior Fellow Offline Best Design Tool = Capable Designers Posts: 1638 San Diego California	Re: a input rail-to-rail opamp design Reply #3 - Nov 22^nd, 2010, 2:15pm How about starting with a little academic research first? No offense, but you need to open both textbooks and IEEE JSSC papers, rather than just throwing it at a forum and letting someone else do the work.
Back to top	Jerry Twomey www.effectiveelectrons.com Read My Electronic Design Column Here Contract IC-PCB-System Design - Analog, Mixed Signal, RF & Medical IP Logged

mowiehowie Junior Member Offline Posts: 26	Re: a input rail-to-rail opamp design Reply #4 - Dec 13^th, 2010, 8:54am theres a technique called "rail-to-rail input stage with complementary differential pairs". check it out.
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