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Bipolar Transistor in CMOS

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bipolaar transistor of cmos

the bipolar transistor in CMOS is the parasitic device. you can get the layout gds from the fab
 

transistor g d s ?

What's the meaning of layout gds?
pfd001 said:
the bipolar transistor in CMOS is the parasitic device. you can get the layout gds from the fab
Click to expand...
 

cmos 0.18um transistor

Usually , the fab itself will make the design as well as layout of some of the common BJTs like 5X5 NPN and similar and provide it to the customers. This is provided in a format called GDS.

The structure of BJT is :-

The Inner most Emmiter is formed by diffusion and taps...the Structure of BJT (PNP) in TSMC 0.18 , would most probably be like shown in the picture attached below.

For NPN the diffusion polarity would reverse. The Figure shows a Cross sectional view.
 

    isaacnewton

    isaacnewton

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npn tsmc

gds file is the streamfile of the layout...
 

beta of bipolar transistor in cmos

tsmc/ umc or other Fab will provide 5x5 or 10x10um (emitter area) BJT gds layout . but you should know
in CMOS no twin/triple_well , only PNP bjt be use

beta is small , only use for diode or bandgap cell

some high Volt cmos process provide "really Npn or PNP" device .

by the way , parastic BJT spice model is simple
even corner model not provide by Txmc/uxc ..
 

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