A Rail-to-Rail Input Class-AB Linear Amplifier with Improved Bandwidth and Slew-Rate for Envelope Tracking Supply Modulators

This paper presents a rail-to-rail input, class-AB output linear amplifier for an envelope tracking supply modulator for radio-frequency (RF) power amplifier applications. Flipped voltage follower (FVF) and slew-rate enhancement circuits are used to improve the bandwidth and the output slew-rate of...

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Bibliographic Details
Main Authors: Prasad, Kondapalli Surya, Hemanth, Pudi, Mandal, Debashis
Format: Conference Proceeding
Language:English
Subjects:
Bandwidth
Class-AB linear amplifiers
Envelope tracking supply modulators
Input rail-to-rail linear amplifiers
Linear amplifiers with improved output slew-rates
Power amplifiers
Radio frequency
Rail to rail inputs
RF signals
Simulation
Voltage
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Description
Summary:This paper presents a rail-to-rail input, class-AB output linear amplifier for an envelope tracking supply modulator for radio-frequency (RF) power amplifier applications. Flipped voltage follower (FVF) and slew-rate enhancement circuits are used to improve the bandwidth and the output slew-rate of the linear amplifier. This makes it suitable for high peak-to-average power ratio RF signals in modern mobile communication systems. The linear amplifier is designed and simulated in 180 nm CMOS technology. The simulation results show improvements of about 75% unity-gain-bandwidth, 111% rise slew-rate, 121% fall slew-rate, and 100% rail-to-rail input sine signal frequency, compared to a linear amplifier without both FVF and slew-rate enhancement.
ISSN:2158-1525
DOI:10.1109/ISCAS58744.2024.10558486