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• W1665620417 abstract "This paper presents a 0.5-V 1.5-bit double-sampled ΔΣ modulator for audio applications. Unlike existing double-sampled designs, the proposed double-sampled ΔΣ modulator employs an input-feedforward topology to reduce internal signal swings, thereby relaxing design requirements for the low-voltage building blocks and reducing distortion. Moreover, in order to avoid instability and noise shaping degradation, the proposed architecture restores the noise transfer function (NTF) of the double-sampled modulator to its single-sampled equivalent with the help of compensation loops. In the circuit implementation, the proposed fully-differential amplifier adopts an inverter output stage and a common-mode feedback (CMFB) circuit with a global feedback loop in order to reduce power consumption. A resistor-string-reference switch matrix based on a direct summation quantizer is used to simplify the analog compensation loop. The chip prototype has been fabricated in a 0.13-μm CMOS technology with a core area of 0.57 mm <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sup> . The measured results show that when operating from a 0.5-V supply and clocked at 1.25 MHz, the modulator achieves a peak signal-to-noise and distortion ratio (SNDR) of 81.7 dB, a peak signal-to-noise ratio (SNR) of 82.4 dB and a dynamic range (DR) of 85.0 dB while consuming 35.2 μW for a 20-kHz signal bandwidth." @default.
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• W1665620417 date "2012-03-01" @default.
• W1665620417 modified "2023-10-16" @default.
• W1665620417 title "A 0.5-V 35-$ mu $W 85-dB DR Double-Sampled $DeltaSigma$ Modulator for Audio Applications" @default.
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• W1665620417 doi "https://doi.org/10.1109/jssc.2011.2181677" @default.
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