Comparison of Two Bandpass Delta-Sigma A/D Converter Architectures
Abstract
This study compares the performance and robustness of single loop and cascaded bandpass delta-sigma analog-to-digital (A/D) converter architectures. A 4th order single loop modulator and a 4th order 1-1 cascaded architecture are designed to provide a basis for comparison of SNR performance and robustness to capacitor mismatch and finite operational amplifier gain variations. Several different approaches to the design of error cancellation circuitry in the cascaded architecture are presented. MATLAB simulations of the two architectures is used to show that the single loop modulator yields better SNR performance than the cascaded modulator. Both architectures' perform comparably under capacitor mismatch variations. The effects of operational amplifier gain on both architectures are insignificant for gains greater than about 8,000.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 13, 2000
- Accession Number
- ADA378902
Entities
People
- Sevgi Ertan
Organizations
- Air Force Institute of Technology