S? Modulator System-Level Considerations for Hearing-Aid Audio Class-D Output Stage Application

Konferenz: PRIME 2012 - 8th Conference on Ph.D. Research in Microelectronics & Electronics
12.06.2012-15.06.2012 in Aachen, Germany

Tagungsband: PRIME 2012

Seiten: 4Sprache: EnglischTyp: PDF

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Pracný, Peter; Bruun, Erik (Department of Electrical Engineering, Technical University of Denmark, Kgs. Lyngby, Denmark)

This paper deals with a system-level design of a digital σ-δ (SigmaDelta) modulator for hearing-aid audio Class D output stage application. The aim of this paper is to provide a thorough discussion on various possibilities and tradeoffs of ???? modulator system-level design parameter combinations - order, oversampling ratio (OSR) and number of bits in the quantizer - including their impact on interpolation filter design as well. The system is kept in digital domain up to the input of the Class D power stage including the digital pulse width modulation (DPWM) block. Notes on the impact of the DPWM block on the modulated spectrum are provided. Keywords-Σ-Δ modulator; Interpolation filter; Class D; Hearing aid; low voltage, low power