US 12,456,989 B2
Nested delta-sigma analog-to-digital conversion system and method
Yuekang Guo, Shanghai (CN); Jing Jin, Shanghai (CN); Xiaoming Liu, Shanghai (CN); and Jianjun Zhou, Shanghai (CN)
Assigned to SHANGHAI JIAO TONG UNIVERSITY, Shanghai (CN)
Filed by SHANGHAI JIAO TONG UNIVERSITY, Shanghai (CN)
Filed on Feb. 6, 2024, as Appl. No. 18/433,541.
Claims priority of application No. 202310266590.1 (CN), filed on Mar. 17, 2023.
Prior Publication US 2024/0178859 A1, May 30, 2024
Int. Cl. H03M 3/00 (2006.01)
CPC H03M 3/49 (2013.01) [H03M 3/464 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A nested Δ-Σ analog-to-digital conversion system comprises: an analog filter, an analog comparator, a first feedback digital-to-analog converter (DAC), a second feedback digital-to-analog converter placed in front of the first feedback digital-to-analog converter, and a digital filter and a most significant bit (MSB) quantizer placed at an output of the analog comparator, which are sequentially connected, and wherein an input of the first feedback digital-to-analog converter is connected to the output of the analog comparator; the analog filter, the analog comparator, and the first feedback digital-to-analog converter form an internal analog Δ-Σ loop; an input of the second feedback digital-to-analog converter is connected to an output of the MSB quantizer; an output of the second feedback digital-to-analog converter is connected to an output of the first feedback digital-to-analog converter and to an input of the analog filter; and the second feedback digital-to-analog converter, the internal analog Δ-Σ loop, the digital filter, and the MSB quantizer form an external hybrid Δ-Σ loop.