| Citation: |
Li Yuanwen, Qi Da, Dong Yifeng, Xu Jun, Ren Junyan. A 1-V 60-μW 85-dB dynamic range continuous-time third-order sigma–delta modulator[J]. Journal of Semiconductors, 2009, 30(12): 125011. doi: 10.1088/1674-4926/30/12/125011
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Li Y W, Qi D, Dong Y F, Xu J, Ren J Y. A 1-V 60-μW 85-dB dynamic range continuous-time third-order sigma–delta modulator[J]. J. Semicond., 2009, 30(12): 125011. doi: 10.1088/1674-4926/30/12/125011.
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A 1-V 60-μW 85-dB dynamic range continuous-time third-order sigma–delta modulator
DOI: 10.1088/1674-4926/30/12/125011
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Abstract
A 1-V third order one-bit continuous-time (CT) Σ∆ modulator is presented. Designed in the SMIC mixed-signal 0.13-µm CMOS process, the modulator utilizes active RC integrators to implement the loop filter. An efficient circuit design methodology for the CT Σ∆ modulator is proposed and verified. Low power dissipation is achieved through the use of two-stage class A/AB amplifiers. The presented modulator achieves 81.4-dB SNDR and 85-dB dynamic range in a 20-kHz bandwidth with an over sampling ratio of 128. The total power consumption of the modulator is only 60 μW from a 1-V power supply and the prototype occupies an active area of 0.12 mm2.-
Keywords:
- analog-to-digital converter
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