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This paper presents a 1.1 mW 87 dB dynamic range third orderΔΣmodulator implemented in 0.18μm 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.
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 controller achieves 87 dB DR and 83.8 dB peak SNDR across the bandwidth from 100 Hz to 24 kHz with 3 kHz input signal.