Output Impedance Shaping for Frequency Compensation of MOS Audio Power Amplifiers

Ronan A.R. van der Zee; Fred Mostert

doi:10.1109/JSSC.2009.2012448

Output Impedance Shaping for Frequency Compensation of MOS Audio Power Amplifiers

Ronan A.R. van der Zee, Fred Mostert

Research output: Contribution to journal › Article › Academic › peer-review

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Abstract

A frequency compensation technique for MOS audio power amplifiers is presented that allows the frequency compensation capacitors around the power transistors to be smaller than the circuit parasitics without power or stability penalty. Stability is analysed by inspecting the output impedance of the closed loop amplifier, instead of the traditional open-loop gain. By degenerating the gain of the penultimate stage, the output impedance is shaped such that the stability of the audio amplifier is guaranteed for complex loudspeaker loads. The realized amplifier features a THD of 0.005% @ (1 kHz, 10 W), an SNR of 110 dB(A), and stable operation for any passive load up to 50 nF.

Original language	English
Pages (from-to)	928-934
Number of pages	7
Journal	IEEE journal of solid-state circuits
Volume	44
Issue number	3
DOIs	https://doi.org/10.1109/JSSC.2009.2012448
Publication status	Published - 1 Mar 2009

Keywords

EWI-15297
IR-65468
METIS-263820

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abstract = "A frequency compensation technique for MOS audio power amplifiers is presented that allows the frequency compensation capacitors around the power transistors to be smaller than the circuit parasitics without power or stability penalty. Stability is analysed by inspecting the output impedance of the closed loop amplifier, instead of the traditional open-loop gain. By degenerating the gain of the penultimate stage, the output impedance is shaped such that the stability of the audio amplifier is guaranteed for complex loudspeaker loads. The realized amplifier features a THD of 0.005% @ (1 kHz, 10 W), an SNR of 110 dB(A), and stable operation for any passive load up to 50 nF.",

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doi = "10.1109/JSSC.2009.2012448",

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AU - van der Zee, Ronan A.R.

AU - Mostert, Fred

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N2 - A frequency compensation technique for MOS audio power amplifiers is presented that allows the frequency compensation capacitors around the power transistors to be smaller than the circuit parasitics without power or stability penalty. Stability is analysed by inspecting the output impedance of the closed loop amplifier, instead of the traditional open-loop gain. By degenerating the gain of the penultimate stage, the output impedance is shaped such that the stability of the audio amplifier is guaranteed for complex loudspeaker loads. The realized amplifier features a THD of 0.005% @ (1 kHz, 10 W), an SNR of 110 dB(A), and stable operation for any passive load up to 50 nF.

AB - A frequency compensation technique for MOS audio power amplifiers is presented that allows the frequency compensation capacitors around the power transistors to be smaller than the circuit parasitics without power or stability penalty. Stability is analysed by inspecting the output impedance of the closed loop amplifier, instead of the traditional open-loop gain. By degenerating the gain of the penultimate stage, the output impedance is shaped such that the stability of the audio amplifier is guaranteed for complex loudspeaker loads. The realized amplifier features a THD of 0.005% @ (1 kHz, 10 W), an SNR of 110 dB(A), and stable operation for any passive load up to 50 nF.

KW - EWI-15297

KW - IR-65468

KW - METIS-263820

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DO - 10.1109/JSSC.2009.2012448

M3 - Article

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VL - 44

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EP - 934

JO - IEEE journal of solid-state circuits

JF - IEEE journal of solid-state circuits

IS - 3

ER -

Output Impedance Shaping for Frequency Compensation of MOS Audio Power Amplifiers

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Keywords

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