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Detail
Journal Article
5.2 mW 61 dB SNDR 15 MHz Bandwidth CT ΔΣModulator Using Single Operational Amplifier and Single Feedback DAC
- Authors
- Young-Kyun Cho, Bong Hyuk Park, Choul-Young Kim
- Issue Date
- 2016-04
- Citation
- ETRI Journal, v.38, no.2, pp.217-226
- ISSN
- 1225-6463
- Publisher
- 한국전자통신연구원 (ETRI)
- Language
- English
- Type
- Journal Article
- Abstract
- We propose an architecture that reduces the power consumption and active area of such a modulator through a reduction in the number of active components and a simplification of the topology. The proposed architecture reduces the power consumption and active area by reducing the number of active components and simplifying the modulator topology. A novel second-order loop filter that uses a single operational amplifier resonator reduces the number of active elements and enhances the controllability of the transfer function. A trapezoidal-shape half-delayed return-to-zero feedback DAC eliminates the loop-delay compensation circuitry and improves pulse-delay sensitivity. These simple features of the modulator allow higher frequency operation and more design flexibility. Implemented in a 130 nm CMOS technology, the prototype modulator occupies an active area of 0.098 mm2 and consumes 5.23 mW power from a 1.2 V supply. It achieves a dynamic range of 62 dB and a peak SNDR of 60.95 dB over a 15 MHz signal bandwidth with a sampling frequency of 780 MHz. The figure-ofmerit of the modulator is 191 fJ/conversion-step.
- KSP Keywords
- 130 nm, Active Element, Active area, Active components, CMOS Technology, Compensation circuitry, Design flexibility, Higher frequency, MHz bandwidth, Operational Amplifier, Power Consumption