| 摘要 |
A low dropout voltage regulator with non-Miller frequency compensation is provided. The LDO circuit has two wide-band, low-power cascaded operational transconductance amplifiers (OTAs): an error amplifier and a unity-gain-configured voltage follower. The unity-gain-configured voltage follower drives a gate of a power PMOS path transistor with a high parasitic gate capacitance. The wide-band, low-power OTAs enable the use of a single, low-value, external compensation capacitor with a low equivalent series resistance (ESR). An on-chip-compensation capacitor is connected in parallel with the upper resistor of a feedback network, which introduces a zero-pole pair that enhances the phase margin close to unity-loop-gain frequency.
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