14.8. Output Circuit of the TS271 Opamp
The TS271 operational amplifier is designed to operate at very low current levels. This would include the current of the source follower of the output stage. In this case, the output resistance of an amplifier with a simple source-follower stage for an output stage, such as in Fig. 14.7, would be unacceptably high. In the TS271 operational amplifier, the 9-transistor circuit of Fig. 14.8 replaces the simple source-follower stage consisting of M6 and M13 of Fig. 14.7. Note that the circuit of Fig. 14.8 uses different transistor designators. In Fig. 14.7, M6 and M13 are equivalent to M1 and Mn1 of Fig. 14.8.
Figure 14.8. The output stage of the TS271 opamp. The new source follower consisting of M1 and M ...
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