Discreate-Time Second-Order Delta-Sigma A/D Modulator Improving SQNR and Suppressing Harmonic Distortions by Correlated Level Shifting Technique

2021 ◽  
Vol 141 (12) ◽  
pp. 1313-1320
Author(s):  
Hayato Takita ◽  
Tatsuji Matsuura ◽  
Ryo Kishida ◽  
Akira Hyogo
Keyword(s):  
Second Order ◽  
Delta Sigma ◽  
Correlated Level Shifting ◽  
Harmonic Distortions

scholarly journals A Low-Power Opamp-Less Second-Order Delta-Sigma Modulator for Bioelectrical Signals in 0.18 µm CMOS

Sensors ◽  
2021 ◽  
Vol 21 (19) ◽  
pp. 6456
Author(s):  
Fernando Cardes ◽  
Nikhita Baladari ◽  
Jihyun Lee ◽  
Andreas Hierlemann
Keyword(s):  
Low Power ◽  
Low Frequency ◽  
Cmos Technology ◽  
Low Noise ◽  
Second Order ◽  
Frequency Noise ◽  
Voltage Controlled Oscillator ◽  
Noise Shaping ◽  
Delta Sigma Modulator ◽  
Delta Sigma

This article reports on a compact and low-power CMOS readout circuit for bioelectrical signals based on a second-order delta-sigma modulator. The converter uses a voltage-controlled, oscillator-based quantizer, achieving second-order noise shaping with a single opamp-less integrator and minimal analog circuitry. A prototype has been implemented using 0.18 μm CMOS technology and includes two different variants of the same modulator topology. The main modulator has been optimized for low-noise, neural-action-potential detection in the 300 Hz–6 kHz band, with an input-referred noise of 5.0 μVrms, and occupies an area of 0.0045 mm2. An alternative configuration features a larger input stage to reduce low-frequency noise, achieving 8.7 μVrms in the 1 Hz–10 kHz band, and occupies an area of 0.006 mm2. The modulator is powered at 1.8 V with an estimated power consumption of 3.5 μW.

Highly Digital Second-Order $\Delta\Sigma$ VCO ADC

2019 ◽  
Vol 66 (7) ◽  
pp. 2415-2425 ◽  
Author(s):  
Akshay Jayaraj ◽  
Mohammadhadi Danesh ◽  
Sanjeev Tannirkulam Chandrasekaran ◽  
Arindam Sanyal
Keyword(s):  
Second Order ◽  
Delta Sigma

scholarly journals A 1 V 92 dB SNDR 10 kHz Bandwidth Second-Order Asynchronous Delta-Sigma Modulator for Biomedical Signal Processing

Sensors ◽  
2020 ◽  
Vol 20 (15) ◽  
pp. 4137
Author(s):  
Vilém Kledrowetz ◽  
Lukáš Fujcik ◽  
Roman Prokop ◽  
Jiří Háze
Keyword(s):  
Signal Processing ◽  
Supply Voltage ◽  
Input Voltage ◽  
General Purpose ◽  
Second Order ◽  
Biomedical Signal Processing ◽  
Center Frequency ◽  
Voltage Range ◽  
Delta Sigma Modulator ◽  
Delta Sigma

In this paper, a second-order asynchronous delta-sigma modulator (ADSM) is proposed based on the active-RCintegrators. The ADSM is implemented in the 0.18 μ m CMOS Logic or Mixed-Signal/RF, General Purpose process from the Taiwan Semiconductor Manufacturing Company with a center frequency of 848 kHz at a supply voltage of 1 V with a 92 dB peak signal-to-noise and distortion ratio ( S N D R ), which corresponds to 15 bit resolution. These parameters were achieved in all the endogenous bioelectric signals bandwidth of 10 kHz. The ADSM dissipated 295 μ W and had an area of 0.54 mm 2 . The proposed ADSM with a high resolution, wide bandwidth, and rail-to-rail input voltage range provides the universal solution for endogenous bioelectric signal processing.

scholarly journals Testing second-order delta–sigma modulators using pseudo-random patterns

2002 ◽  
Vol 33 (10) ◽  
pp. 807-814 ◽  
Author(s):  
C.K Ong ◽  
J.L Huang ◽  
K.T Cheng
Keyword(s):  
Second Order ◽  
Delta Sigma ◽  
Random Patterns
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