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2002•Unpublished venueRequires access

A high efficiency class A amplifier accompanied by class D switching amplifier

Jae Hoon Jeong, Gue Hong Kim, Byeong Rok Min, Che Hong Ahn, Gyu Hyeong Cho

Open publisher page 38 citations

Abstract

A high power class A amplifier has excellent fidelity but dissipates too much power. A class D amplifier has high efficiency but shows poor fidelity. This paper proposes a combination of a high fidelity class A power amplifier with class D power amplifier as variable power supply. This amplifier named as class I has the merits of both class A amplifier and class D. The efficiency is seventy-seven percent at full power rating. The distortion of the proposed amplifier is about the same as that of class A amplifier. The measured 3 dB bandwidth is from 10 Hz to 100 kHz.

About this research paper

What this paper is about

A high power class A amplifier has excellent fidelity but dissipates too much power. A class D amplifier has high efficiency but shows poor fidelity. This paper proposes a combination of a high fidelity class A power amplifier with class D power amplifier as variable power supply. This amplifier named as class I has the merits of both class A amplifier and class D. The efficiency is seventy-seven percent at full power rating. The distortion of the proposed amplifier is about the same as that of class A amplifier. The measured 3 dB bandwidth is from 10 Hz to 100 kHz.

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OpenAlex reports 38 citations for this work. Citation counts describe recorded attention and do not establish research quality.

Key contribution

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Method / approach

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Available abstract

A high power class A amplifier has excellent fidelity but dissipates too much power. A class D amplifier has high efficiency but shows poor fidelity. This paper proposes a combination of a high fidelity class A power amplifier with class D power amplifier as variable power supply. This amplifier named as class I has the merits of both class A amplifier and class D. The efficiency is seventy-seven percent at full power rating. The distortion of the proposed amplifier is about the same as that of class A amplifier. The measured 3 dB bandwidth is from 10 Hz to 100 kHz.

Key concepts: RF power amplifier, Direct-coupled amplifier, Linear amplifier, Amplifier, Power-added efficiency, Cascade amplifier, Operational transconductance amplifier, Power bandwidth

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