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The Choice Of Amplifier Amplifier Structure

Operational amplifier structure there are three important: (a) a simple two-stage amplifier, (b) folded-cascode, (c) a total of cascode, as shown in Figure 1 preamp. The design of the op-amp design index differential output amplitude of ± 4V, all NMOS output tubes VDSAT,N and less than 0.5V, VDSAT,P of all PMOS output tubes and must be less than 0.5V[1].

Main operational structure

The operational amplifier, there are two levels: (1) the Cascode stage increase the DC gain (M1-M8), and (2), the common-source amplifier (M9-M12)