Paper Information

Journal:   JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN)   December 2002 , Volume 36 , Number 3 (77); Page(s) 333 To 344.
 
Paper: 

DESIGN A 3.3-V 18-BIT SIGMA-DELTA MODULATOR FOR DIGITAL AUDIO APPLICATIONS

 
 
Author(s):  YAVARI M., SHOAEI O.
 
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Abstract: 

This paper presents a 3.3-V, 18-bit sigma-delta modulator designed for digital audio. It has been simulated in a 0.6 m double poly, triple metal CMOS process using poly-poly capacitors in all process corners and considering ±10 % power supply voltage variations and -40 oC to 85oC temperature range. The integral gain coefficients of a 2-2 cascaded sigma-delta modulator are realized to achieve a higher overload level factor that is needed for high-resolution noise limited performance modulators. The achieved overload level factor is -0.6 dBFS. This modulator samples at -6.4 MHz with OSR of 128 and Nyquist rate of 50 KHz. Simulation results give SNDR and DR of 110 dB and 114 dB, respectively including of the circuit noise. The total power consumption of the modulator including that of the output buffers, voltage buffers and clock generators is 80 mW.

 
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