Time-domain Continuous-time Delta-sigma Modulator using VCO-based Integrator and GRO-based Quantizer
- Authors
- Lee, Eunsang; Han, Jaeduk
- Issue Date
- Aug-2022
- Publisher
- Institute of Electronics Engineers of Korea
- Keywords
- Time-domain; continuous-time deltasigma modulator (CTDSM); VCO-based integrator; GRO-based quantizer; analog-to-digital converter (ADC)
- Citation
- Journal of Semiconductor Technology and Science, v.22, no.4, pp.259 - 265
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- Journal of Semiconductor Technology and Science
- Volume
- 22
- Number
- 4
- Start Page
- 259
- End Page
- 265
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/185363
- DOI
- 10.5573/JSTS.2022.22.4.259
- ISSN
- 1598-1657
- Abstract
- This paper presents a 3rd-order time-domain continuous-time delta-sigma modulator (CTDSM) using two voltage-controlled oscillator (VCO)-based integrators and a gated ring oscillator (GRO)-based quantizer. The GRO-based quantizer has 1st-order noise-shaping characteristics without the increase of the signal transfer function (STF) order and has magnificent linearity. Also, the output of the GRO-based quantizer has an intrinsic data weighted averaging (DWA)-based dynamic element matching (DEM) pattern that is less susceptible to the DAC mismatch. The PWM signal, which is the input of the GRO-based quantizer, is generated by the VCO-based integrator without additional blocks. In the pre-layout simulation, the CTDSM consumes 3.84 mW and achieves an SNDR of 71.2 dB at a 400-MSs sampling frequency and a 10-MHz bandwidth.
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