A 120nW 18.5kHz RC oscillator with comparator offset cancellation for &amp;#x00B1;0.25% temperature stability

A UHF RFID tag chip solution with a new oscillator calibration scheme and an EEPROM solution with memory capacity as big as 16k bits was presented. The new calibration scheme adopts a calibration command compatible with EPC Protocol, then, a field and low cost oscillator calibration is realized. To reduce the read power of the EEPROM when the storage capacity is increased to 16k bits, a global power management strategy is adopted. Thus, the capacitance load for read operation is reduced, which will result in low power consumption, and the total current consumption for the read operation is 2.26 µA. The proposed calibrated oscillator and 16k bits EEPROM were then integrated and verified in a full UHF RFID tag chip. The achieved read communication range is 3 m. The test results show that the calibration error of the oscillator is 5.7%, which can be further improved by adopting a large current switch array with each current switch carry smaller calibration current I ref /M.

Section: Measurement Resultsmentioning

confidence: 99%

Section: Realization Of the Oscillator Calibration Schemementioning

confidence: 99%

Section: A Detail Schematic Of Oscmentioning

confidence: 99%

See 1 more Smart Citation

A UHF RFID chip solution with new oscillator calibration scheme and 16k bits EEPROM

Zhang

et al. 2016

“…Fig. 3 plots the change in power consumption of low-power LSI chips reported from 2007 to 2014 at ISSCC and VLSI Circuits [3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37], which are the most popular international conferences in the semiconductor industry. It is found that there are three domains: milliwatt, microwatt, and nanowatt.…”

Section: Trends In Circuit Technology and Energy Harvestingmentioning

confidence: 99%

Ultra-low-power circuit techniques for mm-size wireless sensor nodes with energy harvesting

Morimura¹,

Oshima²,

Matsunaga³

et al. 2014

This paper describes circuit techniques for energy-harvesting technology in millimeter-size ultra-low-power batteryless wireless sensor nodes as a front end for BigData, IoT, M2M, and ambient intelligence. Power generated by energy harvester becomes as small as the nanowatt level when the size of a sensor node becomes millimeter-size. First, technical trends in low-power circuits and the portfolio of energy harvesting and circuit technology are discussed from the viewpoints of technical and application issues. Then, circuit techniques for nanowatt level wireless sensor nodes -a zero-power vibration sensing circuit, power management with MEMS switch, and an intermitted RF transmitter -are explained.

“…Ring oscillators [5] are considerably accurate, but consume several hundred microwatts. Relaxation oscillators [3,6,7,8,9] can achieve good temperature performance while operate at lower power, which is extremely suitable for low power applications.…”

Section: Introductionmentioning

confidence: 99%

A low power low supply sensitivity current-mode relaxation oscillator

Sun

Han

Qian

2014

This paper presents a design of a 100 kHz 0.54 µW fully integrated current-mode relaxation oscillator. The transistors in the sub-threshold region, the current-mode comparator, the current-starving RS flip-flop are used to reduce the power consumption. Meanwhile, the employing of the current-starving RS flip-flop significantly reduces the sensitivity of the frequency to supply voltage fluctuation. The temperature coefficient is 51 ppm/°C from −40 to 85°C, and the line regulation is −0.40%/V over a supply voltage range from 1.0 to 2.0 V. This oscillator is designed in SMIC 0.18 µm CMOS technology and operates at minimum supply voltage of 1.0 V with drawn current of 540 nA at room temperature.