Fully‐VCO‐based 0‐2 MASH CT ΔΣ ADC

Xing, Xinpeng; Zhu, Pengcheng; Liu, Hui; Gielen, Georges

doi:10.1049/el.2018.1284

Cited by 6 publications

(2 citation statements)

References 8 publications

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“…Until very recently, an important limitation of most practical designs is the restriction to firstorder low-pass noise shaping. Today, some architectures implementing higherorder low-pass NTFs have been published [4], [74], [104], [105]. There also have been a few attempts toward band-pass architectures such as e.g.…”

Section: Quadrature Band-pass Vco-based A/d Conversionmentioning

confidence: 99%

VCO-ADCs with a Quadrature Band-Pass Noise-Transfer-Function

Gutierrez

Alvero-Gonzalez

Hernández

et al. 2019

2019 IEEE International Symposium on Circuits and Systems (ISCAS)

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I would like to extend my sincere thanks to all the people who contributed to complete this academic work.First and foremost, I would like to express my deepest gratitude to my PhD advisor, Eric Gutierrez. I could not have undertaken this journey and written this thesis without his invaluable supervision, persistent support and patience. I am extremely thankful for his wise guidance and overall insights in this field that have helped me to grow intellectually. He has been my mentor, teacher, and the best advisor for my PhD degree.Thanks to the members of the Electronic Technology Department at Carlos III University of Madrid, who awarded me one of the full scholarships to study the Master in Electronic Systems Engineering, which gives me access to this doctoral program.I would like to offer my special thanks to Prof. Luis Hernández for give me the opportunity to join his research group. His treasured support allows me to conduct this thesis. I am also grateful to Prof. Susana Patón for her appreciation and encouragement who generously provided knowledge and expertise.Thanks to HiSilicon Sponsorship Program for MPW Prototyping for the funding and support provided in the implementation of the 65-nm test chip.I would like to thank all my colleagues of the microelectronics team, especially my lab mates, Andrés, Carlos y Pablo, for their kind help and cherished time spent together that have made this journey a wonderful time.Quiero agradecer a mi familia, la de sangre y la "postiza", y a mis amigos por su apoyo incondicional; ellos son mi arma espiritual. Mi agradecimiento imperecedero a mis padres, por todo el amor, la fuerza y la confianza que siempre me han transmitido. A pesar de la distancia, ellos han recorrido este camino conmigo. Agradezco inmensamente a mi hermana porque siempre me ha ayudado y me ha soportado sin importar lo difícil que haya podido ser; su presencia es una de mis mayores fortunas.El más grande de mis agradecimientos es para mi pareja, Harold, el mejor acompañante que he podido tener en esta travesía. Este trabajo es también resultado de su paciencia inquebrantable. Sus palabras han sido siempre mi mejor cura. Nunca sabré definir acertadamente la forma única que tienes de impulsarme. Espero ser capaz de concederte todo lo que me has entregado incondicionalmente. v

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Section: Quadrature Band-pass Vco-based A/d Conversionmentioning

confidence: 99%

VCO-ADCs with a Quadrature Band-Pass Noise-Transfer-Function

Gutierrez

Alvero-Gonzalez

Hernández

et al. 2019

2019 IEEE International Symposium on Circuits and Systems (ISCAS)

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“…Recently, another type of the DSM, called Frequency Delta-Sigma Modulator (FDSM), has attracted considerable attention, which uses a voltage controlled oscillator (VCO) [ 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ]. The FDSM uses an intermediate frequency modulation (FM) signal that is generated by the VCO, and it has no feedback DAC or integrator.…”

Section: Introductionmentioning

confidence: 99%

Noise Floor Reduction in Frequency Delta-Sigma Modulation Microphone Sensors

Maezawa

Mori

Andoh

2021

Sensors

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Frequency delta-sigma modulator (FDSM) employing a variable frequency oscillator is a novel replacement of the classical delta-sigma modulators. This is advantageous for application to sensors, because an ADC can be intrinsically integrated with the sensors. We have already proposed to use this technique to various sensors. However, the signal-to-noise ratio was significantly degraded by noise floor, in the previous papers. In this paper, we have investigated the origin of the noise floor in the FDSM microphone sensors as a promising example. It was demonstrated that improving the phase noise of the oscillator can drastically reduce the noise floor. For this reduction we improved the Q-factor of the cavity resonator, and the design of the oscillator circuit. With these improvements, the phase noise, and, hence, the noise floor, were improved by approximately 40 dB. In addition, we obtained an SNR of 57 dB for 114 dBSPL sound input with 96 kHz bandwidth, which corresponds to the dynamic range of 87 dB for maximum 140 dBSPL. A much larger dynamic range of around 120 dB is expected by increasing the sampling rate and decreasing the Al diaphragm thickness. These results also indicate the promise of the FDSM to varieties of physical sensors.

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Enhanced Linearity in FD-SOI CMOS Body-Input Analog Circuits – Application to Voltage-Controlled Ring Oscillators and Frequency-Based ΣΔ ADCs

Ahmadi-Farsani

Zuniga-Gonzalez

Serrano-Gotarredona

et al. 2020

IEEE Trans. Circuits Syst. I

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This paper investigates the use of the body terminal of MOS transistors to improve the linearity of some key circuits used to implement analog and mixed-signal circuits integrated in Fully Depleted Silicon on Insulator (FD-SOI) CMOS. This technology allows to increase the body factor with respect to conventional (bulk) CMOS processes. This effect is analyzed in basic analog building blocks -such as switches, simplestage transconductors and Voltage-Controlled Ring Oscillators (VCROs). Approximated expressions are derived for the nonlinear characteristics and harmonic distortion of some of these circuits. As an application, transistor-level simulations of two VCRO-based Σ∆ modulators designed in a 28-nm FD-SOI CMOS technology are shown in order to demonstrate the benefits of the presented techniques.

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Fully‐VCO‐based 0‐2 MASH CT ΔΣ ADC

Cited by 6 publications

References 8 publications

VCO-ADCs with a Quadrature Band-Pass Noise-Transfer-Function

VCO-ADCs with a Quadrature Band-Pass Noise-Transfer-Function

Noise Floor Reduction in Frequency Delta-Sigma Modulation Microphone Sensors

Enhanced Linearity in FD-SOI CMOS Body-Input Analog Circuits – Application to Voltage-Controlled Ring Oscillators and Frequency-Based ΣΔ ADCs

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