| Citation: |
Liu Liyuan, Chen Liangdong, Li Dongmei, Wang Zhihua, Wei Shaojun. A 1.1 mW 87 dB dynamic range ΔΣ modulator for audio applications[J]. Journal of Semiconductors, 2010, 31(5): 055003. doi: 10.1088/1674-4926/31/5/055003
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Liu L Y, Chen L D, Li D M, Wang Z H, Wei S J. A 1.1 mW 87 dB dynamic range ΔΣ modulator for audio applications[J]. J. Semicond., 2010, 31(5): 055003. doi: 10.1088/1674-4926/31/5/055003.
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Abstract
This paper presents a 1.1 mW 87 dB dynamic range third order ΔΣ modulator implemented in 0.18 μm CMOS technology for audio applications. By adopting a feed-forward multi-bit topology, the signal swing at the output of the first integrator can be suppressed. A simple current mirror single stage OTA with 34 dB DC gain working under 1 V power supply is used in the first integrator. The prototype modulator achieves 87 dB DR and 83.8 dB peak SNDR across the bandwidth from 100 Hz to 24 kHz with 3 kHz input signal.-
Keywords:
- ΔΣ?? modulator
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