Abstract
A new transistor model is used for design of two LDO regulators using a differential stage loaded by a current amplifier and the voltage feedback. The first LDO has a constant bias current, the second LDO has an additional adaptable bias circuit controlled by the load current. The LDOs are analyzed and compared. When the load is absent, the transistors in both circuits are operating in weak inversion; when the load is increasing the pass transistors in both circuits are moving to strong inversion. It is shown that in these LDOs the output voltage may be higher than the input reference voltage at very small load currents, and the circuits start “to follow” the input voltage only being loaded with a load current depending on the bias and LDO loop gain. The circuits were designed for 130 nm CMOS technology and their operation was verified using CADENCE simulation tool.
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