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hi all:
when i cancel the first order TC the bandgap output voltage at 27C is
Vgo+(η-1)VT=1.205+0.067=1.272,but the simulation result is 1.184 .is the formula not right or somthing else? ths
you can access Matlab central file exchange to get SD Toolbox 2:
h**p://www.mathworks.com/matlabcentral/fileexchange/loadFile.do?objectId=7589&objectType=File
regards!
Re: why folded cascode amplifier has lower voltage than casc
indeed, your circuit differs from that i think. it's a circuit related to RF? i'm not familiar with this type of circuit, sorry.
look forward to others' reply
Re: why folded cascode amplifier has lower voltage than casc
yes, you'r right
maybe your circuit differs from that i think. can you upload your circuit?
Re: why folded cascode amplifier has lower voltage than casc
in output stage of the folded cascode amplifier, four transistors stack together, the supply needed is 4*Vds,sat for them working normally. considering the bias circuit consisting of a mirroring MOS and a diode-connceted MOS, the...
when input Vin reach to -2.5, output voltage is lowest, at the time the current 200uA flow through the MOS and the resistor 10kOhm
when input Vin reach to +2.5, output voltage is highest, the MOS cuts off, the current 200uA flow into the resistor 10kOhm
when input Vin step from -2.5 to +2.5, SR+...
Re: why folded cascode amplifier has lower voltage than casc
for max{(4*Vds,sat),(Vgs+Vds,sat)}, it refers to the larger value, for example, (Vgs+Vds,sat)=0.58V is larger than 4*Vds,sat=0.2V, so it's (Vgs+Vds,sat), 0.58V.
for telescopic amplifier, in your situation, the results is same
Re: why folded cascode amplifier has lower voltage than casc
oh, sorry, it should be max{(4*Vds,sat),(Vgs+Vds,sat)} and max{(5*Vds,sat),(Vgs+Vds,sat)}
i assume the transistors work in saturation region, and i also consider the bias circuit including a mirroring MOS and a diode-connected MOS...
Re: why folded cascode amplifier has lower voltage than casc
if these amplifier work in saturation region, in theory, the minimum supply voltage of folded cascode amplifier is min{(4*Vds,sat),(Vgs+Vds,sat)}, and that of telescopic amplifier is min{(5*Vds,sat),(Vgs+Vds,sat)}. but considering the...
in my understand, when there are even fingers in multifinger MOS, the number of drain isn't equal to that of source based on the layout selection, so the parasitic capacitance between drain or source and substrate is different
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