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Design of low noise class D amplifiers using an integrated filter

Design of low noise class D amplifiers using an integrated filter
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摘要 This paper investigates the noise sources in a single-ended class D amplifier（SECDA） and suggests corresponding ways to lower the noise.The total output noise could be expressed as a function of the gain and noises from different sources.According to the function,the bias voltage（V_B） is a primary noise source,especially for a SECDA with a large gain.A low noise SECDA is obtained by integrating a filter into the SECDA to lower the noise of the V_B.The filter utilizes an active resister and an 80 pF capacitance to get a 3 Hz pole.A noise test and fast Fourier transform analysis show that the noise performance of this SECDA is the same as that of a SECDA with an external filter. This paper investigates the noise sources in a single-ended class D amplifier（SECDA） and suggests corresponding ways to lower the noise.The total output noise could be expressed as a function of the gain and noises from different sources.According to the function,the bias voltage（V_B） is a primary noise source,especially for a SECDA with a large gain.A low noise SECDA is obtained by integrating a filter into the SECDA to lower the noise of the V_B.The filter utilizes an active resister and an 80 pF capacitance to get a 3 Hz pole.A noise test and fast Fourier transform analysis show that the noise performance of this SECDA is the same as that of a SECDA with an external filter.
作者 王海时 张波
机构地区 State Key Laboratory of Electronic Thin Films and Integrated Devices
出处 《Journal of Semiconductors》 EI CAS CSCD 2012年第11期67-71,共5页 半导体学报（英文版）
关键词 class D amplifier low noise filter noise derivation class D amplifier low noise filter noise derivation
分类号 TN713 [电子电信—电路与系统] TN722.3 [电子电信—电路与系统]
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参考文献11

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Journal of Semiconductors
2012年 第11期

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