Ultra low power pulse generator based on a ring oscillator with direct path current avoidance

Veirano, Francisco; Pérez, Pablo; Besio, S.; Castro, P.; Silveira, Fernando

doi:10.1109/lascas.2013.6519036

Cited by 12 publications

(2 citation statements)

References 3 publications

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“…However, [17] does not report energy/power at the lowest frequency, while the energy at the highest frequency is 2.8× higher than hCERO considering technology scaling such as capacitance and supply voltage (9.4× without considering technology scaling). Although [23] and [24] show good performance with respect to EpC, their frequency range is not nearly as wide as the CERO or the hCERO, and their oscillators are not verified in silicon. The CERO and the hCERO demonstrate good EpC over a wide frequency range.…”

Section: Measurement Resultsmentioning

confidence: 99%

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A Constant Energy-Per-Cycle Ring Oscillator Over a Wide Frequency Range for Wireless Sensor Nodes

Lee

Sylvester

Blaauw

2016

IEEE J. Solid-State Circuits

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This paper presents an energy-efficient oscillator for wireless sensor nodes (WSNs). It avoids short-circuit current by minimizing the time spent in the input voltage range from Vthn to [Vdd − |Vthp|]. A current-feeding scheme with gate voltage control enables the oscillator to operate over a wide frequency range. A test chip is fabricated in a 0.18 μm CMOS process. The measurements show that the proposed oscillator achieves a constant energy-per-cycle (EpC) of 0.8 pJ/cycle over the 21–60 MHz frequency range and is more efficient than a conventional current-starved ring oscillator (CSRO) below 300 kHz at 1.8 V supply voltage. As an application example, the proposed oscillator is implemented in a switched-capacitor DC–DC converter. The converter is 11%–56% more efficient for load power values ranging from 583 pW to 2.9 nW than a converter using a conventional CSRO.

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Section: Measurement Resultsmentioning

confidence: 99%

“…However, in ring oscillator circuits, the proportionality of power with frequency has not typically been considered as an important factor [17]-[23]. Although [24] proposed a ring oscillator that consumes power proportional to the frequency, the circuit was not verified in silicon, and its lowest frequency range is limited to 1.75 kHz.…”

Section: Introductionmentioning

confidence: 99%