A 20MHz BW 68dB DR CT &amp;#x0394;&amp;#x03A3; ADC based on a multi-bit time-domain quantizer and feedback element

Dhanasekaran, V.; Gambhir, M.; El-Sayed, Mohamed; Sánchez-Sinencio, E.; Silva-Martí­nez, J.; Mishra, C.; Chen, Lei; Pankratz, Erik

doi:10.1109/isscc.2009.4977364

Cited by 47 publications

(28 citation statements)

References 5 publications

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“…2, the change in the width of the pulse corresponds to the AC amplitude. The benefit of using this measurement technique is that it is scalable since the required information can be easily measured using a low power TDC integrated on chip in modern CMOS nodes where high time resolution can be reached due to high device f t available in these processes [27]- [29].…”

Section: Heterodyned Sensor Architecture For Frequency Domain Nirsmentioning

confidence: 99%

A CMOS Sensor for Measurement of Cerebral Optical Coefficients Using Non-Invasive Frequency Domain Near Infrared Spectroscopy

Koomson

2013

IEEE Sensors J.

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A heterodyned architecture is integrated with a 180 nm CMOS chip for use in portable frequency domain near infrared spectroscopy (fdNIRS) tools for real time monitoring of tissue oxygenation in the brain. The design and performance measurement results of this chip are summarized in this paper to demonstrate its applicability in multi-distance fdNIRS to measure the absorption and scattering coefficients of tissue. The 2.25 mm 2 chip is integrated with four sensor channels, which have a high frequency low noise front end and information processing circuitry to interface with an avalanche photodiode to detect the high speed weak light signal. The four-channel sensor draws 40 mA of current from a 1.8 V power supply and uses an offchip counter implemented on an FPGA to quantify the amplitude and phase information required for tissue characterization with < 6.5% and < 2.5% linearity error, respectively. An experiment using the multi-distance measurement is used to measure the optical properties of a homogeneous tissue phantom using the CMOS integrated instrument.Index Terms-Frequency domain near infrared spectroscopy, CMOS, transimpedance amplifier, amplitude and phase detection, amplifier noise, optical sensor.

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Section: Heterodyned Sensor Architecture For Frequency Domain Nirsmentioning

confidence: 99%

A CMOS Sensor for Measurement of Cerebral Optical Coefficients Using Non-Invasive Frequency Domain Near Infrared Spectroscopy

Koomson

2013

IEEE Sensors J.

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“…The time-domain signal processing nature of the proposed -PWD architecture allows the SR-RX to be less sensitive to analog nonidealities and PVT variations [21]. Furthermore, such digitally enhanced approach will lead to a more energy-efficient operation in advanced deep-submicrometer CMOS processes.…”

Section: Discussionmentioning

confidence: 99%

A Delta-Sigma Pulse-Width Digitization Technique for Super-Regenerative Receivers

Liu

Lin

2010

IEEE J. Solid-State Circuits

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This paper presents a delta-sigma pulse-width digitizer (16-PWD) architecture designed for a super-regenerative receiver (SR-RX) operated at the 400-MHz Medical Implantable Communications Service (MICS) band. The 16-PWD employs the operation principle of a 16 modulator to convert the pulse-width (PW) value into digital domain and achieve fine resolution, which allows the SR-RX to support the 2-ASK/4-ASK modulations. It can be considered as the PW domain counterpart of a conventional 16 modulator. The proposed architecture is capable of suppressing the PW quantization error over the direct-sampling-type PW detector by 23 dB. A linear model for the 16-PWD is devised in this paper for system analysis and design optimization. Fabricated in a 0.18-m CMOS process, the whole receiver draws 700 A from a 1.3-V supply, while the 16-PWD consumes only 100 A. When operated on the 4-ASK modulation signal with 312-kbps data rate, the receiver achieves an energy efficiency of 2.9 nJ/bit and 76-dBm sensitivity.Index Terms-Amplitude-shift keying (ASK), delta-sigma modulator, pulse-width detection, super-regenerative receiver.

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“…One recent trend to alleviate such difficulties is to shift voltage-domain analog processing into the time-domain to take better advantage of the power-efficient and scalable digital circuits: time-based [2] and voltage-controlled oscillatorbased ADCs [3]. A time-domain ADC architecture that implements pulse width modulator (PWM) and time-todigital converter (TDC) in feedback loop is presented [4]. This architecture improves the linearity of PWM.…”

Section: Introductionmentioning

confidence: 99%

An all-digital PWM-based ΔΣ ADC with an inherently matched multi-bit quantizer

Jung

Mortazavi

Evans

et al. 2014

Proceedings of the IEEE 2014 Custom Integrated Circuits Conference

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An all-digital PWM-based delta-sigma (ΔΣ) ADC is proposed. This system takes advantages of the duration of a pulse, rather than voltage or current, as the analog operand used in its closed-loop operation. Unlike VCO-based ADCs, this ADC as a linear input sampling stage with adequate uncalibrated performance. Furthermore, the architecture allows inherently matched multi-bit quantizer/DAC blocks by taking advantage of delay lines reusable in both quantization and DAC operation. A 3-bit prototype of this ADC in 0.18 μm CMOS process is implemented, tested, and presented. With an OSR of 72 and a bandwidth of 1 MHz, it achieves a dynamic range of 51 dB and SNDR of 49.6 dB while consuming 1.5 mA from a 1.8 V supply. The core occupies an area of 0.0275 mm 2 .

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A 20MHz BW 68dB DR CT ΔΣ ADC based on a multi-bit time-domain quantizer and feedback element

Cited by 47 publications

References 5 publications

A CMOS Sensor for Measurement of Cerebral Optical Coefficients Using Non-Invasive Frequency Domain Near Infrared Spectroscopy

A CMOS Sensor for Measurement of Cerebral Optical Coefficients Using Non-Invasive Frequency Domain Near Infrared Spectroscopy

A Delta-Sigma Pulse-Width Digitization Technique for Super-Regenerative Receivers

An all-digital PWM-based ΔΣ ADC with an inherently matched multi-bit quantizer

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A 20MHz BW 68dB DR CT &#x0394;&#x03A3; ADC based on a multi-bit time-domain quantizer and feedback element

Cited by 47 publications

References 5 publications

A CMOS Sensor for Measurement of Cerebral Optical Coefficients Using Non-Invasive Frequency Domain Near Infrared Spectroscopy

A CMOS Sensor for Measurement of Cerebral Optical Coefficients Using Non-Invasive Frequency Domain Near Infrared Spectroscopy

A Delta-Sigma Pulse-Width Digitization Technique for Super-Regenerative Receivers

An all-digital PWM-based &#x0394;&#x03A3; ADC with an inherently matched multi-bit quantizer

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A 20MHz BW 68dB DR CT ΔΣ ADC based on a multi-bit time-domain quantizer and feedback element

An all-digital PWM-based ΔΣ ADC with an inherently matched multi-bit quantizer