Title :
Saturation recovery technique for high-order bandpass switched capacitor ΣΔ modulators
Author :
Cusinato, P. ; Pasolini, F. ; Stefani, F. ; Baschirotto, A.
Author_Institution :
STMicroelectronics, Milan, Italy
fDate :
6/23/1905 12:00:00 AM
Abstract :
This paper focuses on the topic of ΣΔ modulators stability and saturation recovery for high-order Switched Capacitor (SC) structures. A technique, which allows a fast recover of the modulator from instability (<300ns) and guarantees a minimum of 20dB SNR also when the architecture gets unstable, is proposed. This technique is based on two steps: (1) instability detection with system recovery and (2) digital post-processing. This strategy has been applied to a 6th-order SC bandpass ΣΔ modulator operating at 42.8MHz with 74dB Dynamic Range (DR). The proposal is validated by extended experimental results
Keywords :
circuit noise; circuit stability; sigma-delta modulation; switched capacitor networks; 42.8 MHz; SNR; digital post-processing; dynamic range; high-order bandpass switched capacitor sigma-delta modulator; instability detection; saturation recovery; stability; Capacitors; Dynamic range; Filtering theory; Frequency; Instruments; Lifting equipment; Proposals; Stability; Technological innovation; Topology;
Conference_Titel :
Electronics, Circuits and Systems, 2001. ICECS 2001. The 8th IEEE International Conference on
Print_ISBN :
0-7803-7057-0
DOI :
10.1109/ICECS.2001.957688
