Thesis
Design of a voltage-to-time converter and selection of a time-to-digital converter for use in a time-based analog-to-digital converter
Washington State University
Master of Science (MS), Washington State University
12/2015
Handle:
https://hdl.handle.net/2376/105062
Abstract
Analog-to-digital converters (ADC) are becoming essential to the function of ultra-high speed interconnects, while at the same time reduction in supply voltage has negatively impacted the performance of such circuits. However the improvement in delay times and reduction in logic size has made time-based ADCs attractive in order to take advantage of quantization in the time domain. To accomplish this, first a voltage-to-time converter (VTC) is used to generate signals with a time difference proportional to the input voltage. Next a time-to-digital converter (TDC) quantizes the time difference between the two signals resulting in a time-based ADC. In this work a VTC design is presented in 65nm CMOS that when simulated with post-layout extracted parasitics has an input range of +/-0.5V and is capable of achieving 7.6 effective bits at 4GS/s up to the Nyquist frequency. The resulting output range of the VTC is +/-63ps. The layout area of the VTC, excluding the track-and-hold, clock drivers and voltage bias network, is 828.24 µm2. With a power supply of 1V the power dissipation, including all circuit elements, is 8mW resulting in a figure of merit for the VTC and related circuits of 10.3fJ/conversion-step. Existing TDC designs are reviewed to determine the architectures that are most suitable for implementing a TDC that when combined with this VTC will create an 8 bit 4GS/s time-based ADC.
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Details
- Title
- Design of a voltage-to-time converter and selection of a time-to-digital converter for use in a time-based analog-to-digital converter
- Creators
- Peter A. Osheroff
- Contributors
- George S. La Rue (Chair)Subhanshu Gupta (Committee Member) - Washington State University, Electrical Engineering and Computer Science, School ofBenjamin Joseph Belzer (Committee Member) - Washington State University, Electrical Engineering and Computer Science, School of
- Awarding Institution
- Washington State University
- Academic Unit
- Electrical Engineering and Computer Science, School of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Number of pages
- 79
- Identifiers
- 99900525393101842
- Language
- English
- Resource Type
- Thesis