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A single-chip 20-channel speech spectrum analyzer using a multiplexed switched-capacitor filter bank

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4 Author(s)

A single-chip speech spectrum analyzer which contains a 20-channel filter bank, a 9-bit-resolution analog-to-digital converter, and a 396-bit buffer memory is described. Several efficient design techniques were used to realize the equivalent 308th-order transfer functions on a single chip monolithic MOS circuit. A new time-division-multiplexed switched-capacitor filter technique is introduced which can easily cancel DC offsets which appear in the multiplexed channel outputs. The LSI was fabricated in 3.5-/spl mu/m CMOS technology, with a 7.0/spl times/6.5 mm/SUP 2/ die size, a power consumption of 150 mW, with a single power supply of +5 V. Experimental results show that designed performance was realized.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:19 ,  Issue: 6 )

Date of Publication:

Dec. 1984

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