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Re: regulator noise
I am glad to you fix the power bus width.
1) the phase margin not effect the high frequence noise, if the phase margin is not large enough, the bandgap output would osc.., and if you worry about the power noise, you need run the PSRR, and addd coupling cap and filter...
transistor sizing
you could use any value of W, L and m factor,
and in fact you could use .scale option in hspice to shink you transitor size, for example, you use a PMOS as W=1000u, L=500u, m=100, at the same time you define .option scale=0.01, so you final Pmos size is w=10000*0.0001=100u...
regulator noise
1st, you have make sure the power bus is strong enough to supply large current loading, this could ensue the power of bandgap is higher enough for ouput the ideal value you wanted. 2nd, you need optimize your bandgap circuit, it coud work well with lower power.
Added after 2...
only the minimum channel length is different,
of course, use 0.5um process can product 0.6u channel length mos.
Added after 44 seconds:
the speed will be increase, and vt will decrease form 0.6um process to 0.5um process.
r/2r dac equation
could you re-upload a more clear pic?
in generally, the r2r calculate is easy, please from the terminal close the vref,then one by one to the termal close the opamp.
I think you can get the value,
nomally, I use the hspice run simulation,
i use .probe lx7(device name), the the wave form will show the gm of the mosfets. I think the spectre should have the same feature.
hope it it help for you, good luck.
battery operated 3.3v supply
your are right, for the internal vcc=3.3/1.8v, you can use a regulator or ldo to generate this supply.
but for the +12, you have to use a boost circuit or charge pump. the +6v value, you can use a clamp circuit, the power could be +12v and the battery supply, when...
when clk='L', detect the value, and when clk='h', latch the value, why do as this, to increase the speed.
Added after 35 seconds:
it will be call as sense amplifier.
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