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For a perfect linear system DR and SNR are equivalent.
The proper definiton of DR is the ration of max/min signal amplitude at which a min SNR is guaranteed.
They clearly differ for non-linear systems.
nathan
samuel, the described approach applies to all fully differential OPA, they use the generic OPA symbol in the presentation. You can substitute your schematic to the symbol one or create the symbol view from your schematic (clearly you need to have Cadence installed somewhere :-) )
nathan
The level shift is needed to keep the core devices (i.e., M6 and M3 or M7 and M2) properly biased. Infact, for a given bias current you need to guarantee a DVgs+Vth each for strong inversion condition.
Note that M1 and M4 act as a source follower here (almost ideal) such that, from a small...
what is sfdrl
To be more precise: it is the difference between the power of the signal and the one at which the spurious signals and noise are the same.
nathan
Re: Bipolar RFIC Design
I confirm what Mazz says, still, almost all worldwide corporates (US+European+Japanese) use BiCMOS for RF applications. From my experience I can also say that very unlikely these companies will migrate to pure CMOS before next generation of products which will happen...
closed-loop phase noise
Just a general statement:
think about the PLL as an amplifier that works on phase rather tahn voltage and think about the VCO as a noise generator.
When you close the VCO in the loop the effective phase noise is reduced by a factor equal to the loop gain of the PLL...
This is a simple hybrid class A/AB amplifier (input stage is class A and output is class AB).
The trick is that your non-dominant pole is at higher freq (about a factor of two) than the standard miller amplifier.
Same power but better phase margin.
nathan
BTW: you don't need two compensation...
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