Title :
Implementation of a micro power 15-bit `floating-point´ A/D converter
Author :
Grisoni, E. ; Heubi, A. ; Balsiger, P. ; Pellandini, F.
Author_Institution :
Inst. of Microtechnol., Neuchatel Univ., Switzerland
Abstract :
Micro power A/D converter are required for power sensitive, battery-operated equipment such as hearing aids. This paper overviews the principles of the 15-bit `floating point´ converter and presents its implementation in a low voltage 2 μm CMOS technology. The die area is 1.4 by 1.4 mm and the power consumption 50 μW at ±1.25 V and 16 kHz sampling frequency. Measurement showed that the internal noise level is higher then expected resulting in a reduced dynamic range of 13 to 14 bits. Informal listening tests showed a very good speech quality
Keywords :
CMOS integrated circuits; analogue-digital conversion; audio signals; hearing aids; -1.25 V; 1.25 V; 15 bit; 16 kHz; 2 micron; 50 muW; battery-operated equipment; floating-point ADC; hearing aids; low voltage CMOS technology; micro power A/D converter; CMOS technology; Dynamic range; Energy consumption; Frequency; Hearing aids; Low voltage; Noise level; Noise measurement; Sampling methods; Testing;
Conference_Titel :
Low Power Electronics and Design, 1996., International Symposium on
Conference_Location :
Monterey, CA
Print_ISBN :
0-7803-3571-6
DOI :
10.1109/LPE.1996.547517
