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A Hybrid Audio ΔΣ Modulator with dB-Linear Gain Control Function.
- Source :
- ETRI Journal; Dec2011, Vol. 33 Issue 6, p897-903, 7p
- Publication Year :
- 2011
-
Abstract
- A hybrid ΔΣ modulator for audio applications is presented in this paper. The pulse generator for digital-to-analog converter alleviates the requirement of the external clock jitter and calibrates the coefficient variation due to a process shift and temperature changes. The input resistor network in the first integrator offers a gain control function in a dB-linear fashion. Also, careful chopper stabilization implementation using return-to-zero scheme in the first continuous-time integrator minimizes both the influence of flicker noise and inflow noise due to chopping. The chip is implemented in a 0.13 µm CMOS technology (I/O devices) and occupies an active area of 0.37 mm². The ΔΣ modulator achieves a dynamic range (A-weighted) of 97.8 dB and a peak signal-to-noise-plus-distortion ratio of 90.0 dB over an audio bandwidth of 20 kHz with a 4.4 mW power consumption from 3.3 V. Also, the gain of the modulator is controlled from -9.5 dB to 8.5 dB, and the performance of the modulator is maintained up to 5 ns<subscript>RMS</subscript> external clock jitter. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 12256463
- Volume :
- 33
- Issue :
- 6
- Database :
- Supplemental Index
- Journal :
- ETRI Journal
- Publication Type :
- Academic Journal
- Accession number :
- 69978110
- Full Text :
- https://doi.org/10.4218/etrij.11.0111.0293