Modelling and setting times of amplifiers in SC circuits

摘要

Various types of amplifier used in SC circuits are modelled and compared by studying their settling behaviour when they are embedded in a capacitive environment. It is shown that the frequently used buffered op-amp model does not coincide with the amplifiers used in practical SC circuits. The comparison of single and two stage amplifiers shows definite advantages in the former especially when built as cascode OTAs. Formulas for the performance under slew rate conditions are also developed. Lastly, simulated frequency responses using the two amplifiers with high clock rates are reported.