A 90.9 dB SNDR 95.3 dB DR Audio Delta-Sigma Modulator with FIA-Assisted OTA

This paper presents a low-power, high-gain integrator design that uses a cascode operational transconductance amplifier (OTA) with floating inverter-amplifier (FIA) assistance. Compared to a traditional cascode, the proposed integrator can achieve a gain of 80 dB, while reducing power consumption by...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2024-02, Vol.24 (5), p.1449
Main Authors: Huang, Gongxing, Wei, Cong, Wei, Rongshan
Format: Article
Language:English
Subjects:
analog-to-digital conversion
audio
Bandwidths
Capacitors
Circuits
delta–sigma modulator
discrete-time
Energy conservation
Energy efficiency
floating inverter–amplifier
Noise control
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Summary:This paper presents a low-power, high-gain integrator design that uses a cascode operational transconductance amplifier (OTA) with floating inverter-amplifier (FIA) assistance. Compared to a traditional cascode, the proposed integrator can achieve a gain of 80 dB, while reducing power consumption by 30%. Upon completing the analysis, the value of the FIA drive capacitor and clock scheme for the FIA-assisted OTA were obtained. To enhance the dynamic range (DR) and mitigate quantization noise, a tri-level quantizer was employed. The design of the feedback digital-to-analog converter (DAC) was simplified, as it does not use additional mismatch shaping techniques. A third-order, discrete-time delta-sigma modulator was designed and fabricated in a 0.18 μm complementary metal-oxide semiconductor (CMOS) process. It operated on a 1.8 V supply, consuming 221 µW with a 24 kHz bandwidth. The measured SNDR and DR were 90.9 dB and 95.3 dB, respectively.
ISSN:1424-8220
1424-8220
DOI:10.3390/s24051449