An ultra-low power voltage level shifter for passive wireless microsystems

Lai, Xiongliang; Yuan, Fei

doi:10.1109/mwscas.2011.6026336

Cited by 2 publications

(5 citation statements)

References 4 publications

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“…Layout diagrams and a wafter micrograph were provided. Measurement results of the voltage shifting levels agree well with theoretical values[32,49,52,53].…”

supporting

confidence: 81%

“…The low current driving ability of half-latch voltage level shifters can be mitigated by replacing the pull-up PMOS latch with a current mirror, however, at the cost of excessive static power consumption [26]. transistors with low-V T H transistors placed in locations where speed is critical and high-V T H transistors placed in locations where leakage current is essential [32].…”

Section: Voltage Level Shiftersmentioning

confidence: 99%

“…This advantage arises from multi-voltage system design techniques where the critical parts of the passive microsystem operate in conventional super-threshold mode with a higher supply voltage, while the vast majority of the non-critical parts of the passive microsystem operates in subthrehold mode with a reduced supply voltage [24,44]. The resulting multi-voltage subthreshold systems-on-a-chip (SoCs) lead to significant power reduction in passive wireless microsystems [32]. are presented in Section 2.6.…”

Section: Chapter 2 Passive Voltage Level Shiftersmentioning

confidence: 99%

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Design techniques for passive wireless microsystems

Lai¹

2021

Preprint

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The unique advantage of harvesting power wirelessly has evolved passive wireless microsystems to a fast-growing high-impact technology. In this dissertation, several new design techniques are proposed for the increasingly stringent requirements of passive wireless microsystems. The absence of on-board batteries imposes ultralow power consumption of passive wireless microsystems. Recent research reveals that multi-voltage systems-on-a-chip dramatically reduce power consumption such that power-efficient on-chip voltage level shifters are critically needed. This dissertation proposes a novel set of voltage level shifters built upon diode-based clamper-rectifier configurations. The voltage level shifters are passively powered by incoming signals with no static current consumption and are able to shift the incoming signals bidirectionally to suit the different voltage domains. The shifting steps could be continuous and are not bounded by the discrete transistor thresholds and power rails. A second bottleneck of passive wireless microsystems is the wireless power-harvesting efficiency that limits the wireless communication distance and the on-chip circuitry complexity and functionality. This dissertation proposes a transformer-based impedance matching network that greatly improves the power transfer efficiency from the receiving antenna to the on-chip circuit loads. The transformer is also capable of automatically calibrating its input impedance to match to the antenna impedance by a novel low-power varactor current tuning technique. In passive wireless microsystems, data modulation scheme largely determines the power transmission efficiency and data communication speed. Exploiting the constant carrier envelop of FSK modulation, this dissertation proposes a dual-tank architecture for FSK receivers in passive wireless microsystems. The dual receiving tanks significantly improves the power conversion efficiency of on-chip AC-to-DC voltage multipliers by providing high-quality-factor resonating tank voltages at each of the alternating FSK carriers. High data transmission rate is also achieved by exploring the dual tanks in an all-digital and a voltage-level shifting FSK demodulators.

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“…Layout diagrams and a wafter micrograph were provided. Measurement results of the voltage shifting levels agree well with theoretical values[32,49,52,53].…”

supporting

confidence: 81%

Section: Voltage Level Shiftersmentioning

confidence: 99%

Section: Chapter 2 Passive Voltage Level Shiftersmentioning

confidence: 99%

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Design techniques for passive wireless microsystems

Lai¹

2021

Preprint

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“…Baek , et al [20] proposed a power‐efficient up‐converter by coupling the gate of protection transistors to input capacitively. The voltage shifter by Hasanbegovic and Aunet [21] utilises multi‐threshold transistors with low‐threshold transistors placed in locations where speed is critical and high‐threshold transistors in locations where leakage current is essential. Although source followers, common‐source, common‐gate configurations or circuits alike are handy choices for shifting the median value of analogue signals, their usefulness in low‐power applications is largely affected by their excessive static power consumption.…”

Section: Introductionmentioning

confidence: 99%

“…The amount of voltage shift can either be a multiple or a fraction of the amplitude of the input signal. The preliminary results of the proposed voltage shifters were reported in [21]. This paper presents a complete study with an in‐depth mathematical analysis and extensive simulation.…”

Section: Introductionmentioning

confidence: 99%

Passive voltage shifters for analogue signaling

Lai¹,

Yuan²

2013

IET Circuits, Devices & Systems

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This study proposes passive voltage shifters that shift the median value of an analogue signal by either a multiple or a fraction of the amplitude of the input signal in positive or negative directions. The proposed voltage shifters are powered by the input signal, making them particularly attractive for applications such as implantable devices where power is critical. The primitive configuration of the voltage shifters also makes them well suited for high-frequency applications. A detailed mathematical treatment that quantifies the principle of the voltage shifters is presented. Factors affecting the performance of the proposed voltage shifters are examined in detail.

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An ultra-low power voltage level shifter for passive wireless microsystems

Cited by 2 publications

References 4 publications

Design techniques for passive wireless microsystems

Design techniques for passive wireless microsystems

Passive voltage shifters for analogue signaling

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