Title :
A micropower-compatible time-multiplexed SC speech spectrum analyzer design
Author :
Chang, Joseph S. ; Tong, Y.C.
Author_Institution :
Dept. of Otolaryngol., Melbourne Univ., Vic., Australia
fDate :
1/1/1993 12:00:00 AM
Abstract :
A micropower-compatible time-multiplexed switched-capacitor (SC) speech spectrum analyzer embodying several new design methodologies is described. In the bandpass filter (BPF) section, the DC offset differences between channels are reduced by a careful biquadratic filter design, and a capacitor sharing technique is employed to reduce chip area. A new time-multiplexed full-wave rectifier (FWR) is also proposed. Expressions for the errors that limit the accuracy of the running spectrum due to nonidealities are formulated. An experimental four-channel spectrum analyzer was fabricated and measurements from prototypes showed that the proposed design methodologies are satisfactory in achieving the design specifications
Keywords :
CMOS integrated circuits; analogue processing circuits; signal processing equipment; spectral analysers; speech analysis and processing; switched capacitor networks; time division multiplexing; DC offset differences; SC speech spectrum analyzer design; bandpass filter; biquadratic filter design; capacitor sharing technique; errors; four-channel spectrum analyzer; full-wave rectifier; micropower-compatible; switched-capacitor; time-multiplexed; Band pass filters; Capacitors; Design methodology; Power dissipation; Prosthetics; Prototypes; Rectifiers; Semiconductor device measurement; Spectral analysis; Speech analysis; Speech processing;
Journal_Title :
Solid-State Circuits, IEEE Journal of
