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Single Op-Amp Second-Order Loop Filter for Continuous-Time Delta-Sigma Modulators
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- Authors
- Young-Kyun Cho, Bong Hyuk Park
- Issue Date
- 2015-04
- Citation
- Electronics Letters, v.51, no.8, pp.619-621
- ISSN
- 0013-5194
- Publisher
- IET
- Language
- English
- Type
- Journal Article
- Project Code
- 14MI9100, Development of 5G Mobile Communication Technologies for Hyper-connected smart services, Chung Hyun Kyu
- Abstract
- A second-order loop filter (LF) that uses a single op-amp resonator is presented for continuous-time delta-sigma modulators. The proposed technique improves the power and area efficiency of the LF and enhances the controllability of the transfer function and the resonating condition by providing a new RC network. A second-order modulator has been designed to confirm the effectiveness of the proposed scheme. Implemented in a 130 nm CMOS, the prototype modulator occupies an active area of 0.098 mm2 and consumes 5.23mW power from a 1.2 V supply. It achieves a peak SNDR of 60.95 dB over a 15 MHz signal bandwidth with a sampling frequency of 780 MHz.
- KSP Keywords
- 130 nm, Active area, Continuous-time delta-sigma, Delta-Sigma Modulator, Operational Amplifiers(Op-Amps), RC network, Sampling frequency, area efficiency, loop-filter(LF), second-order, signal bandwidth