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학술지 A Hybrid Audio ΔΣ Modulator with dB-linear Gain Control Function
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김이경, 조민형, 김봉찬, 권종기
ETRI Journal, v.33 no.6, pp.897-903
한국전자통신연구원 (ETRI)
A hybrid ?붞? modulator for audio applications is presented in this paper. The pulse generator for digital-toanalog 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 ?붞? 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 nsRMSexternal clock jitter. © 2011 ETRI.
KSP 제안 키워드
3 V, 7 mm, Active area, CMOS Technology, Continuous-Time, Control functions, Distortion ratio, I/O devices, Power Consumption, Pulse Generator, Signal-to-Noise