SEMICONDUCTOR INTEGRATED CIRCUITS

Design of low noise class D amplifiers using an integrated filter

Wang Haishi and Zhang Bo

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Abstract: 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 (VB) 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 VB. 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.

Key words: class D amplifierlow noisefilternoise derivation

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    Received: 21 August 2015 Revised: 14 August 2012 Online: Published: 01 November 2012

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      Wang Haishi, Zhang Bo. Design of low noise class D amplifiers using an integrated filter[J]. Journal of Semiconductors, 2012, 33(11): 115002. doi: 10.1088/1674-4926/33/11/115002 Wang H S, Zhang B. Design of low noise class D amplifiers using an integrated filter[J]. J. Semicond., 2012, 33(11): 115002. doi: 10.1088/1674-4926/33/11/115002.Export: BibTex EndNote
      Citation:
      Wang Haishi, Zhang Bo. Design of low noise class D amplifiers using an integrated filter[J]. Journal of Semiconductors, 2012, 33(11): 115002. doi: 10.1088/1674-4926/33/11/115002

      Wang H S, Zhang B. Design of low noise class D amplifiers using an integrated filter[J]. J. Semicond., 2012, 33(11): 115002. doi: 10.1088/1674-4926/33/11/115002.
      Export: BibTex EndNote

      Design of low noise class D amplifiers using an integrated filter

      doi: 10.1088/1674-4926/33/11/115002
      • Received Date: 2015-08-21
      • Accepted Date: 2012-06-12
      • Revised Date: 2012-08-14
      • Published Date: 2012-10-23

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