scholarly journals Delta-Sigma Modulator-Based Step-Up DC–DC Converter with Dynamic Output Voltage Scaling

Electronics ◽  
2020 ◽  
Vol 9 (3) ◽  
pp. 498 ◽  
Author(s):  
Young-Kyun Cho ◽  
Bong Hyuk Park ◽  
Seok-Bong Hyun
Keyword(s):  
Conversion Efficiency ◽  
Output Voltage ◽  
Input Voltage ◽  
Low Noise ◽  
Mode Switching ◽  
Noise Shaping ◽  
Delta Sigma Modulator ◽  
Delta Sigma ◽  
Spurious Peak ◽  
Wide Range

The switching noise and conversion efficiency of step-up DC-DC converters need to be improved to meet increasing demand. The delta-sigma modulation (DSM) technique is typically used to improve the performance of buck converters; however, this control scheme is not directly applicable for boost converters. This paper presents a boost DC–DC converter using a continuous-time delta-sigma modulator (DSM) controller for battery-powered and noise-sensitive applications. The proposed converter can adjust a wide range of output voltages dynamically by clamping the maximum duty cycle of the DSM, thus enabling stable and robust transient responses of the converter. The switching harmonics in the converter output are reduced effectively by the noise shaping property of the modulator. Moreover, the converter does not suffer from instability of mode switching due to the use of a fixed third-order DSM. Fabricated in a 180 nm CMOS, the converter occupies an active area of 0.76 mm2. It produced an output voltage ranging from 2.5 V to 5.0 V at an input voltage of 2.0 V and achieved a peak conversion efficiency of 95.5%. The output voltage ripples were maintained under 25 mV for all load conditions. A low noise output spectrum with a first spurious peak located −91 dBc from the signal was achieved.

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.

scholarly journals 4th-Order Switched-Current Multistage-Noise-Shaping Delta-Sigma Modulator With a Simplified Digital Noise-Cancellation Circuit

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 168589-168600
Author(s):  
Guo-Ming Sung ◽  
Chun-Ting Lee ◽  
Xiong Xiao ◽  
Leenendras-Chowdary Gunnam
Keyword(s):  
Noise Cancellation ◽  
Noise Shaping ◽  
Delta Sigma Modulator ◽  
Delta Sigma ◽  
Switched Current

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.

A 101 dB DR 1.1 mW audio delta-sigma modulator with direct-charge-transfer adder and noise shaping enhancement

2012 ◽  
Author(s):  
Tao Wang ◽  
Wei Li ◽  
Hirokazu Yoshizawa ◽  
Mehmet Aslan ◽  
Gabor C. Temes
Keyword(s):  
Charge Transfer ◽  
Noise Shaping ◽  
Delta Sigma Modulator ◽  
Delta Sigma

Low cost universal battery charger for wide range input voltage and wide range output voltage in portable applications

2008 ◽  
Author(s):  
Hidekazu Miwa ◽  
Sung-Yeul Park ◽  
Brian T. Clark ◽  
Danielle S. K. Ditzler ◽  
Greg Malone ◽  
...  
Keyword(s):  
Output Voltage ◽  
Low Cost ◽  
Input Voltage ◽  
Battery Charger ◽  
Wide Range

scholarly journals AC-AC voltage regulation by switch mode PWM Cûk voltage controller with improved performance

2021 ◽  
Author(s):  
Palash K. Banerjee
Keyword(s):  
Output Voltage ◽  
Supply Voltage ◽  
Input Voltage ◽  
Voltage Regulation ◽  
Control Circuit ◽  
Voltage Regulator ◽  
Error Signal ◽  
Constant Voltage ◽  
Wide Range ◽  
Switching Devices

In this research project, an AC Cûk voltage regulator has been proposed for maintaining constant voltage across the load during wide range of input voltage fluctuations. The proposed AC Ck voltage regulator made of practical IGBT switches has been investigated for both manual and automatic control circuit. A fraction of the output voltage is taken as the input voltage of the control circuit and produce the error signal if any changes occur in the output voltage. The modified error signal is used to make PWM signals for switching devices as per output voltage of regulator. The PWM controls the ON/OFF time (Duty cycle) of switching devices (IGBTs) of the proposed regulator. As a result the regulator is maintaining a constant voltage across the load during any change in supply voltage. The simulation waveforms and the calculated total harmonics distortion (THD) values are compared with previously studied AC Buck-Boost regulator. The observed simulated waveforms of output voltage, output current and input current and THD values have been improved in case of proposed AC Cûk voltage regulator.

Experimental Demonstration of Ideal Noise Shaping in Resonant Tunneling Delta-Sigma Modulator for High resolution, Wide Band A/D Converters

2005 ◽  
Author(s):  
K. Maezawa ◽  
M. Sakou ◽  
W. Matsubara ◽  
T. Mizutani ◽  
H. Matsuzaki
Keyword(s):  
High Resolution ◽  
Resonant Tunneling ◽  
Wide Band ◽  
Noise Shaping ◽  
Experimental Demonstration ◽  
Delta Sigma Modulator ◽  
Delta Sigma

Digital Mobile Fronthaul Based on Performance Enhanced Multi-Stage Noise-Shaping Delta-Sigma Modulator

2021 ◽  
Vol 39 (2) ◽  
pp. 439-447
Author(s):  
Ke Bai ◽  
Dongdong Zou ◽  
Zixuan Zhang ◽  
Zibin Li ◽  
Wei Wang ◽  
...  
Keyword(s):  
Noise Shaping ◽  
Delta Sigma Modulator ◽  
Multi Stage ◽  
Delta Sigma

Experimental Demonstration of Ideal Noise Shaping in Resonant Tunneling Delta–Sigma Modulator for High Resolution, Wide Band Analog-to-Digital Converters

2006 ◽  
Vol 45 (4B) ◽  
pp. 3410-3413 ◽  
Author(s):  
Koichi Maezawa ◽  
Mario Sakou ◽  
Wataru Matsubara ◽  
Takashi Mizutani ◽  
Hideaki Matsuzaki
Keyword(s):  
High Resolution ◽  
Resonant Tunneling ◽  
Wide Band ◽  
Analog To Digital Converters ◽  
Noise Shaping ◽  
Experimental Demonstration ◽  
Analog To Digital ◽  
Delta Sigma Modulator ◽  
Delta Sigma
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