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A cascaded sigma-delta pipeline A/D converter with 1.25 MHz signal bandwidth and 89 dB SNR

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5 Author(s)
T. L. Brooks ; Analog Devices Inc., Wilmington, MA, USA ; D. H. Robertson ; D. F. Kelly ; A. Del Muro
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A low-noise multibit sigma-delta analog-to-digital converter (ADC) architecture suitable for operation at low oversampling ratios is presented. The ADC architecture uses an efficient high-resolution pipelined quantizer while avoiding loop stability degradation caused by pipeline latency. A 16-b implementation of the architecture, fabricated in a 0.6-μm CMOS process, cascades a second-order 5-b sigma-delta modulator with a four-stage 12-b pipelined ADC and operates at a low 8X oversampling ratio. Static and dynamic linearity of the integrated ADC are improved through the use of dynamic element matching techniques and the use of bootstrapped and clock-boosted input switches. The ADC operates at a 20 MHz clock rate and dissipates 550 mW with a 5 V/3 V analog/digital supply. It achieves an SNR of 89 dB over a 1.25-MHz signal bandwidth and a total harmonic distortion (THD) of -98 dB with a 100-kHz input signal

Published in:

IEEE Journal of Solid-State Circuits  (Volume:32 ,  Issue: 12 )