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This paper presents an ultra-low voltage and ultra-low power PVT tolerant digital PLL with a semi-digital low dropout regulator (LDO). A low cost integrated temperature compensation circuit (TCC) is proposed and implemented by combining with a proposed ΑΣ LDO to reduce temperature variation of the digitally-controlled relaxation oscillator (DCRXO). A 50-to-145MHz PLL implemented in 65nm CMOS consumes...
This brief describes a pseudodigital oscillator design for low-voltage applications. To overcome the start-up problem of the digitally controlled ring oscillator with an ultralow supply voltage, a digitally controlled relaxation oscillator (DCRXO) that utilizes an inverter-based comparator is proposed. The pseudocomparator (PC), which is a variable threshold inverter, followed by an inverter, is introduced...
A 0.55V 100MHz LDO-embedded ADPLL is implemented in 65nm CMOS. A digitally-controlled relaxation oscillator (DCRXO) with a variable-threshold inverter and a digital calibration circuit is designed for robust start up under ultra-low supply voltage. A ΔΣ modulated pseudo-digital LDO provides a PVT-insensitive dithered internal voltage for the DCRXO. The 100MHz ADPLL including the LDO consumes a 67μW...
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