Two-step multi-stage incremental ADC

作者：Chen Chia Hung^*; Zhang Yi; He Tao; Temes Gabor C

来源：Electronics Letters, 2015, 51(24): 1975-1976.

DOI：10.1049/el.2015.3005

• analogue-digital conversion
• delta-sigma modulation
• amplifiers
• multistage incremental ADC
• multistage noise-shaping
• MASH incremental ADC
• IADC
• high-order delta-sigma modulators
• third-order coarse quantisation
• amplifiers
• oversampling ratio
• wide bandwidth application

Multi-stage noise-shaping (MASH) is a useful technique for the design of stable high-order sigma modulators. A two-step MASH incremental ADC (IADC) is proposed. In the first step it performs a third-order coarse quantisation. Using the same hardware, in the second step the circuit performs fine quantisation as a second-order IADC. Thus, it achieves fifth-order noise shaping with only three amplifiers. For an oversampling ratio OSR = 32, the signal-to-noise ratio can be boosted by about 30 dB. The scheme is suitable for wide bandwidth applications.

• 出版日期2015-11-19