Proceedings ArticleDOI
A 6.66-kHz, 940-nW, 56ppm/°C, fully on-chip PVT variation tolerant CMOS relaxation oscillator
Keishi Tsubaki,Tetsuya Hirose,Yuji Osaki,S. Shiga,Nobutaka Kuroki,Masahiro Numa +5 more
- pp 97-100
TLDR
A fully on-chip CMOS relaxation oscillator (ROSC) with a PVT variation compensation circuit that compensates for comparator's non-idealities caused by offset voltage and delay time is proposed.Abstract:
A fully on-chip CMOS relaxation oscillator (ROSC) with a PVT variation compensation circuit is proposed in this paper. The circuit is based on a conventional ROSC and has a distinctive feature in the compensation circuit that compensates for comparator's non-idealities caused by offset voltage and delay time. We also developed a bias circuit consisting of positive and negative temperature coefficient resistors to obtain the temperature compensated clock frequency. Measurement results demonstrated that the circuit can generate a stable clock frequency of 6.66 kHz. The power dissipation was 940 nW. The measured line regulation and temperature coefficient were 0.98%/V and 56ppm/°C, respectively.read more
Citations
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Proceedings ArticleDOI
A 32.55-kHz, 472-nW, 120ppm/°C, fully on-chip, variation tolerant CMOS relaxation oscillator for a real-time clock application
TL;DR: The ROSC can generate a stable and higher oscillation clock frequency without increasing power by using a low reference voltage and employing a novel compensation architecture for comparator's non-idealities caused by offset voltage and delay time.
Proceedings ArticleDOI
A fully on-chip 25MHz PVT-compensation CMOS Relaxation Oscillator
TL;DR: A fully on-chip, low-power and small area CMOS Relaxation Oscillator (ROSC) with voltage integral feedback structure and a new Bandgap Reference voltage (BGR) for accurate oscillation frequency independent of the PVT and comparator's delay variations is presented.
Proceedings ArticleDOI
A 51-nW 32.7-kHz CMOS relaxation oscillator with half-period pre-charge compensation scheme for ultra-low power systems
TL;DR: A low-power low-cost half-period pre-charge compensation scheme is proposed to eliminate influences of the delay of the comparator and the RS latch on the frequency stability of the relaxation oscillator.
CMOS integrated Circuits for RF-powered Wireless Temperature Sensor
TL;DR: This dissertation presents original research contributions in the form of twelve scientific publications that represent advances related to RF-to-DC converters, reference circuits (voltage, current and frequency) and temperature sensors.
References
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Journal ArticleDOI
An On-Chip CMOS Relaxation Oscillator With Voltage Averaging Feedback
TL;DR: An on-chip CMOS relaxation oscillator with voltage averaging feedback using a reference proportional to supply voltage is presented and achieves 7x reduction in accumulated jitter (at 1500th cycle) as compared to a oscillator without VAF.
Proceedings ArticleDOI
A 280nW, 100kHz, 1-cycle start-up time, on-chip CMOS relaxation oscillator employing a feedforward period control scheme
Takashi Tokairin,Koichi Nose,Koichi Takeda,Koichiro Noguchi,Tadashi Maeda,Kazuyoshi Kawai,Masayuki Mizuno +6 more
TL;DR: A sub-μW, 1-cycle start-up CMOS relaxation oscillator has been developed with a feedforward period control scheme and a digitally-controlled boost charging technique and it has demonstrated 100kHz clock generation with ±1%-accuracy and an extremely low power consumption of 280nW.
Proceedings ArticleDOI
A 32.4 ppm/°C 3.2-1.6V self-chopped relaxation oscillator with adaptive supply generation
TL;DR: A self-chopped relaxation oscillator with adaptive supply generation provides the stable output clock against variations in temperature and supply voltages and is implemented in a 60-nm CMOS technology.
Proceedings ArticleDOI
A 30-MHz, 90-ppm/°C fully-integrated clock reference generator with frequency-locked loop
TL;DR: A temperature- and supply-independent clock generator has been developed using 0.35-µm CMOS technology and can be implemented monolithically without using LC resonant circuits, quartz resonators, and MEMS oscillators.
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