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The flipped voltage follower (FVF), a variant of the common-drain transistor amplifier, comprising local feedback, finds application in circuits such as voltage buffers, current mirrors, class AB amplifiers, frequency compensation circuits and low dropout voltage regulators (LDOs). One of the most important characteristics of the FVF, is its low output impedance. In this tutorial-flavored paper, we...
This paper introduces a multi-loop fast transient response flipped voltage follower (FVF) low-dropout (LDO) voltage regulator suitable for system-on-chip (SOC) applications. While typical FVF-based LDOs exhibit fast transient response, which is critical for SOC applications, their output DC accuracy is limited due to low loop gain of the FVF. In this work, we introduce a multi-loop design aimed at...
In Miller and current buffer compensation techniques, the compensation capacitor often loads the output node. If a voltage buffer is used in feedback, the compensation capacitor obviates the loading on the output node. In this paper, we introduce an implementation of a voltage buffer compensation using a Flipped Voltage Follower (FVF) for stabilizing a two-stage CMOS op-amp. The op-amps are implemented...
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