A Low Voltage All-Digital On-Chip Oscillator Using Relative Reference Modeling

This paper presents a low voltage on-chip oscillator which can compensate process, voltage, and temperature (PVT) variation in an all-digital manner. The relative reference modeling applies a pair of ring oscillators as relative references and estimates period of the internal ring oscillator. The pe...

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Bibliographic Details
Published in:IEEE transactions on very large scale integration (VLSI) systems 2012-09, Vol.20 (9), p.1615-1620
Main Authors: YU, Chien-Ying, YU, Jui-Yuan, LEE, Chen-Yi
Format: Article
Language:English
Subjects:
Accuracy
and temperature (PVT) variations
Applied sciences
Circuit properties
CMOS
Delay
Design. Technologies. Operation analysis. Testing
Digital circuits
Digitally controlled oscillator (DCO)
Electric potential
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
frequency compensation
Frequency division
Frequency measurement
Frequency variation
Integrated circuits
Logic gates
Low voltage
Oscillators
Oscillators, resonators, synthetizers
process
Ring oscillators
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Signal convertors
System-on-a-chip
Very large scale integration
Voltage
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Summary:This paper presents a low voltage on-chip oscillator which can compensate process, voltage, and temperature (PVT) variation in an all-digital manner. The relative reference modeling applies a pair of ring oscillators as relative references and estimates period of the internal ring oscillator. The period estimation is parameterized by a second-order polynomial. Accordingly, the oscillator compensates frequency variations in a frequency division fashion. A 1-20 MHz adjustable oscillator is implemented in a 90-nm CMOS technology with 0.04 mm area. The fabricated chips are robust to variations of supply voltage from 0.9 to 1.1 V and temperature range from 0°C to 75°C. The low supply voltage and the small area make it suitable for low-cost and low-power systems.
ISSN:1063-8210
1557-9999
DOI:10.1109/TVLSI.2011.2160301