Design techniques for voltage-to-time converters with nonlinearity emphasis

Yuan, Fei

doi:10.1007/s10470-022-02019-w

Cited by 4 publications

(2 citation statements)

References 23 publications

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“…Recently, the VTC deployed in time-domain ADC (TDADC) depends more frequently on the second type structure, shown in Fig. 2(b) [27]. Although the specific circuit topology may vary case by case, they all generate the time difference through a constant current to pull up/pull down the transition node, which is set up with a different initial voltage.…”

Section: A Vtc Reviewsmentioning

confidence: 99%

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A 0.6 V 4 GS/s −56.4 dB THD Voltage-to-Time Converter in 28 nm CMOS

2022

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A 0.6 V low-voltage voltage-to-time converter (VTC) has been presented in this work for the emerging energy-efficient time-domain circuits and systems. The proposed VTC supports a rail-to-rail input by leveraging shrink sampling with two cascaded voltage sampling and charge sharing switches, breaking the tradeoff between linearity and input range of the traditional VTC and enabling low voltage operation. The charging current source is adjustable to calibrate the VTC gain variation. In addition, a 4-bit tunable delay buffer is inserted at the output stage to calibrate the VTC time offset, enhancing the PVT performance. By resizing the push-pull inverters' PMOS/NMOS size ratio in the output buffer chain, the jitter contribution from buffers has been reduced. It also recovers the signal's pulse width consumed during the voltage-time conversion, facilitating the time signal processing following VTC. Designed and fabricated in 28 nm CMOS, the prototype VTC occupies a 0.0012 mm 2 active area. Measurement results show that the VTC can run up to 4 GHz at a 0.6 V power supply, achieving -56.4 dB total harmonic distortion (THD) with Nyquist input and consuming 2.1 mW.INDEX TERMS Analog-to-digital converter (ADC), energy-efficient, shrink sampling, time-domain signal processing, low-voltage, voltage-to-time converter (VTC).

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Section: A Vtc Reviewsmentioning

confidence: 99%

“…ADC has been explored and investigated profoundly for years of research and industry implementation. While as the analog front-end for time-domain signal processing, VTC is still in the nascent stage [27]. Compared to ADC, VTC is more area-efficient and energy-efficient because the signal conversion is still in the analog domains.…”

Section: Introductionmentioning

confidence: 99%