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A 1-MHz-Bandwidth Gm-C-Based Quadrature Bandpass Sigma-Delta Modulator Achieving −153.7-dBFS/Hz NSD With Background Calibration.
- Source :
-
IEEE Transactions on Circuits & Systems. Part I: Regular Papers . Mar2019, Vol. 66 Issue 3, p909-919. 11p. - Publication Year :
- 2019
-
Abstract
- This paper presents a fifth-order continuous-time Gm-C-based quadrature bandpass sigma-delta ($\Delta \Sigma$) modulator for Internet-of-Things applications. In the presented $\Delta \Sigma $ modulator, a reconfigurable full-scale input amplitude assists the $\Delta \Sigma $ modulator, achieving a wide dynamic range (DR) and a low-noise floor. A following system-level supply voltage and temperature background tracking technique stabilizes the frequency response of the Gm-C-based quadrature bandpass $\Delta \Sigma $ modulator. Furthermore, the 1.5-bit feedback current DAC employs a PN-based semi-self-swapping logic to relax the matching requirement. The prototype $\Delta \Sigma $ modulator was fabricated in a 180-nm CMOS process with an active area of 0.28 mm2. The $\Delta \Sigma $ modulator achieves a total DR of 93.7 dB with the reconfigurable full-scale input amplitude, resulting in a noise spectral density of −153.7 dBFS/Hz with a bandwidth of 1 MHz. The presented $\Delta \Sigma $ modulator consumes 2.0 mW with a power supply of 1.8 V and a sampling frequency of 32 MHz. [ABSTRACT FROM AUTHOR]
- Subjects :
- *INTEGRATED circuits
*COMPLEMENTARY metal oxide semiconductors
*SIGNAL processing
Subjects
Details
- Language :
- English
- ISSN :
- 15498328
- Volume :
- 66
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Circuits & Systems. Part I: Regular Papers
- Publication Type :
- Periodical
- Accession number :
- 134602191
- Full Text :
- https://doi.org/10.1109/TCSI.2018.2871275