Referenced Items are not available for this document.
A CMOS mixed-mode fully-differential signal processor (VERDI), that constitutes the core of a hearing aid system, is introduced. Its characteristics (frequency response, compression level, and output sound pressure level) are wireless controlled by means of dual tone multi-frequency (DTMF) encoded signals transmitted by an external unit. A system description is provided, and the implementation and experimental results of the key components (preamplifier, antialiasing filter, automatic gain control, filter section, output amplifier, and DTMF receiver/decoder) are covered in more detail. The circuit has been fabricated in a conventional 1.2 μm CMOS n-well process and operates from a single 1.3 V battery, although a dc/dc converter is required. It consumes typically less than 1 mA and occupies 28 mm2 of silicon. The dynamic range is larger than 66 dB for the maximum input signal (54 mVrms=108 dB SPL)
Published in:
Solid-State Circuits, IEEE Journal of
(Volume:31
,
Issue:
5
)
Date of Publication: May 1996
- Page(s):
- 634 - 645
- ISSN :
- 0018-9200
- INSPEC Accession Number:
- 5288165
- Digital Object Identifier :
- 10.1109/4.509846
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 06 August 2002
- Issue Date :
- May 1996
- Sponsored by :
- IEEE Solid-State Circuits Society
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