Thesis
Design considerations for time-domain ring oscillator based low-pass filters
Washington State University
Master of Science (MS), Washington State University
12/2019
DOI:
https://doi.org/10.7273/000000052
Handle:
https://hdl.handle.net/2376/119360
Abstract
Next-generation wireless communications demand high efficiency, low power consumption and
wide bandwidth. As the CMOS technologies scale down, analog circuits suffer from leakage
current and small voltage swing. Time-domain processing circuits can overcome the linearity
decrement and benefit from the improved intrinsic device speed as the power supply scales. This
work presents design considerations employing a time-domain ring oscillator for low-pass
filtering. The proposed architecture can be applied to filter out-of-band quantization noise of
delta-sigma DACs. The ring oscillator act as an integrator in phase domain and is used together
with a loop filter, phase detector and charge pump in negative feedback to achieve energyefficient filtering. This work models the effect of circuit-level imperfections such as mismatches,
finite rise and fall time, and sensitivity to process on linearity of the time-domain filter. Design
considerations for critical design blocks such as ring oscillators and charge pumps are analyzed
with simulated results presented for a 1.6 GHz modulated input PWM signal with 50 MHz
passband. Implemented in TSMC 65nm CMOS process, the proposed time-domain filter
consumes 3.5 mW power.
Metrics
78 File views/ downloads
56 Record Views
Details
- Title
- Design considerations for time-domain ring oscillator based low-pass filters
- Creators
- Qiuyan Xu
- Contributors
- SUBHANSHU GUPTA (Degree Supervisor) - Washington State University, Electrical Engineering and Computer Science, School ofDEUKHYOUN DEUKHYOUN HEO (Committee Member)DAE HYUN KIM (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
- Format
- pdf
- Number of pages
- 72
- Identifiers
- 99900590963001842
- Language
- English
- Resource Type
- Thesis