Title :
A 90 dB SNR, 2.5 MHz output rate ADC using cascaded multibit /spl Delta//spl Sigma/ modulation at 8x oversampling ratio
Author :
Fujimori, I. ; Longo, L. ; Hairapetian, A. ; Seiyama, Kazushi ; Kosic, S. ; Cao, J. ; Shu-Iap Chan
Author_Institution :
AKM Semicond., San Diego, CA, USA
Abstract :
This 16b, 2.5 MHz output rate ADC is intended for xDSL and high-speed instrumentation applications. A fourth-order cascaded /spl Delta//spl Sigma/ modulator (/spl Delta//spl Sigma/M) operating at 20 MHz employs multibit quantization and dynamic element matching (DEM) to make all quantization noise contributions negligible at an oversampling ratio (OSR) of eight. The ADC achieves 90 dB signal-to-noise ratio (SNR) in a 1.25 MHz bandwidth, and 102 dB spurious free dynamic range (SFDR) with 270 mW dissipation.
Keywords :
cascade networks; digital subscriber lines; high-speed integrated circuits; integrated circuit noise; quantisation (signal); sigma-delta modulation; 16 bit; 2.5 MHz; 20 MHz; 370 mW; ADC; cascaded multibit sigma-delta modulation; dynamic element matching; high-speed instrumentation; multibit quantization; output rate; oversampling ratio; quantization noise contributions; signal-to-noise ratio; spurious free dynamic range; xDSL; Bandwidth; Circuit noise; Clocks; Delta modulation; Dynamic range; Large Hadron Collider; Noise shaping; Quantization; Semiconductor device noise; Signal to noise ratio;
Conference_Titel :
Solid-State Circuits Conference, 2000. Digest of Technical Papers. ISSCC. 2000 IEEE International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-5853-8
DOI :
10.1109/ISSCC.2000.839806
