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A 50V, 1.45ns, 4.1pJ high-speed low-power level sifter for high-voltage DCDC converters

  • The level shifter and the floating gate supply for high-side transistors are a major challenge in high-voltage DCDC converters. This paper presents a high speed and power-efficient level shifter for voltages of up to 50V, suitable for both PMOS and NMOS power FETs. A switching node falling edge detection allows both, a sensitive and safe signal detection. This enables a robust operation during steep dv / dt transitions and a power consumption as low as 4.1 pJ per switching cycle, which is a reduction of more than 40% compared to prior art. An active clamping circuit prevents common mode displacement currents into the high-side supply. The level shifter is implemented in a 180nm BiCMOS technology. Measurements confirm a 50V 120MHz high-speed operation of the level shifter with a rising / falling propagation delay of 1.45 ns / 1.3 ns, respectively. The dv / dt robustness has been confirmed by measurements for transitions up to 6V/ ns.

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Author of HS ReutlingenLutz, Daniel; Seidel, Achim; Wicht, Bernhard
Erschienen in:ESSCIRC 2018 : IEEEE 44th European Solid State Circuits Conference (ESSCIRC) : 3-6 Sept. 2018
Place of publication:Piscataway, NJ
Document Type:Conference Proceeding
Year of Publication:2018
Tag:DCDC power converter; high-speed; high-voltage level shifter; low power
Page Number:4
First Page:126
Last Page:129
DDC classes:620 Ingenieurwissenschaften und Maschinenbau
Open Access?:Nein
Licence (German):License Logo  Lizenzbedingungen IEEE