Presentation
In-pixel Voltage-Controlled Ring-Oscillator for Phase Interpolation in ToF Image Sensors
Author/s | Vornicu, Ion
Carmona Galán, Ricardo Rodríguez Vázquez, Ángel Benito |
Department | Universidad de Sevilla. Departamento de Electrónica y Electromagnetismo |
Publication Date | 2016 |
Deposit Date | 2018-05-07 |
Published in |
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Abstract | The design and measurements of a CMOS pseudodifferential
voltage-controlled ring-oscillator (VCRO) are
presented. It is aimed to act as time interpolator for arrayable
picosecond time-to-digital convertors (TDC). This ... The design and measurements of a CMOS pseudodifferential voltage-controlled ring-oscillator (VCRO) are presented. It is aimed to act as time interpolator for arrayable picosecond time-to-digital convertors (TDC). This design is incorporated into a 64×64 array of TDCs for time-of-flight (ToF) measurement. It has been fabricated in a 0.18μm standard CMOS technology. Small occupation area of 28×29μm2 and low average power consumption of 1.17mW at 850MHz are promising figures for this application field. Embedded phase alignment and instantaneous start-up time are required to minimize the offset of time interval measurements. The measured gain of the VCRO is of 477MHz/V with a frequency tuning range of 53%. Moreover it features a linearity of 99.4% over a wide range of control frequencies, namely from 400MHz to 850MHz. The phase noise is of 102dBc/Hz at 2MHz offset frequency from 850MHz. |
Funding agencies | Junta de Andalucía |
Project ID. | TIC 2012- 2338 |
Citation | Vornicu, I., Carmona Galán, R. y Rodríguez Vázquez, Á.B. (2016). In-pixel Voltage-Controlled Ring-Oscillator for Phase Interpolation in ToF Image Sensors. En IEEE International Symposium on Circuits and Systems (ISCAS), Montreal (Canada). |
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