Two stage opamp can't meet your speed requirement.What technology is your choice,0.18um or 0.13um?airboss said:Hi,
would it be easire to use 2 stages?
or can anybody share how we can determine the number of stages and the topology we can use?
thank you.
airboss said:Hi,
would it be easire to use 2 stages?
or can anybody share how we can determine the number of stages and the topology we can use?
thank you.
airboss said:Hi,
I'm a beginner to analog design. I'm working on a project with a spec as follows:
*****
supply 1.8 v
input range p-p 0.9+-250mv pp500mv
output range p-p diff 1v
unity gain bandwidth 1G
phase margin >60
power consumption<20mw
load 1.5pico
*****
My first question is, here, input differential voltage is p-p 500mv and output range is 1v. Does that mean, the Av = 2?
2nd, I want to use telescopic cascode. Do I need to worry about the input signal range? In Razavi's example, he doesn't take the input range into account. But why?
3rd, here I have to get GBW = 1G. How can I start to meet this requirement?
Thanks for any advice in advance.
airboss said:Hi,
Now I get an extra condition. The DC gain is 65 dB at least. Is it good to keep working on folded cascode + gain boosting or 2 stage is fine now?
thank you.
youyang said:in general, 2-stage has superior frequency response, while the fold has better common input range.
merely for 65db, either can achieve readily in case of present processes
yet if you require a 1g unit-gain bandwidth with that "high" dc gain, as posted above, gain-boost is use to attain bandwidth goal.
ipsc said:youyang said:in general, 2-stage has superior frequency response, while the fold has better common input range.
merely for 65db, either can achieve readily in case of present processes
yet if you require a 1g unit-gain bandwidth with that "high" dc gain, as posted above, gain-boost is use to attain bandwidth goal.
Hi youyang,
do you mean, use gain-boost in 2-stage opamp???
airboss said:Hi,
I guess this question sounds a little stupid, but....
I've heard rail-to-rail a few times but I don't really know what it is. Can you give me some examples?
thanks
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