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Low-Power Level-Shifting Architecture for Sub-threshold Logic Circuits

Year: 1393
COI: JR_JESS-2-2_002
Language: EnglishView: 285
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Seyed Rasool Hosseini - Departmant of Electrical Engineering, Ferdowsi University of Mashhad, Iran.
Mehdi Saberi - Departmant of Electrical Engineering, Ferdowsi University of Mashhad, Iran.
Reza Lotfi - Departmant of Electrical Engineering, Ferdowsi University of Mashhad, Iran.


This paper presents a power-efficient voltage level shifter converting low levels of input voltages (sub-threshold) to high levels of the output voltages (above threshold). In order to reduce the existing contention in the output nodes between pull-up and pull-down devices, the proposed circuit uses a current generator to reduce the strength of the pull-up device when the pull-down device is pulling down the output node. This causes the circuit to be functional even for the sub-threshold input voltages. In order to avoid the static power dissipation, this current generator turns on only during the transition times in which the logic level of the input signal is not corresponding to the output logic level. Simulation results of the proposed circuit in a 0.18-µm technology confirm that for a low supply voltage of VDDL = 0.42 V at the input and a high supply voltage of VDDH = 1.8 V at the output, the level shifter has a propagation delay of 22 ns, an energy per transition of 340 fJ, and a static power dissipation of 0.42 nW for 1-M Hz input signal.


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Hosseini, Seyed Rasool and Saberi, Mehdi and Lotfi, Reza,1393,Low-Power Level-Shifting Architecture for Sub-threshold Logic Circuits,

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