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Huh? All CMOS process has Nmos and Pmos. And Nmos is NPN transistor.You'll review the design rules of the respective CMOS process. Some offer NPN transistors, others don't.
Not quite right. Instead of making us retell basic CMOS text book knowledge, why don't review it yourself?Huh? All CMOS process has Nmos and Pmos. And Nmos is NPN transistor.
BJTs are used for the input differential amp because they have low offset voltages.
You could use all CMOS for the complete design but it may require a special process to get the NMOS differential stage offsets as low as desired.