A 0.5-V 1.6-mW 2.4-GHz Fractional-N All-Digital PLL for Bluetooth LE With PVT-Insensitive TDC Using Switched-Capacitor Doubler in 28-nm CMOS

Pourmousavian, Naser; Kuo, Feng Wei; Siriburanon, Teerachot; Babaie, M.; Staszewski, R.B.

doi:10.1109/JSSC.2018.2843337

A 0.5-V 1.6-mW 2.4-GHz Fractional-N All-Digital PLL for Bluetooth LE With PVT-Insensitive TDC Using Switched-Capacitor Doubler in 28-nm CMOS

Title

A 0.5-V 1.6-mW 2.4-GHz Fractional-N All-Digital PLL for Bluetooth LE With PVT-Insensitive TDC Using Switched-Capacitor Doubler in 28-nm CMOS

Author

Pourmousavian, Naser (University College Dublin)
Kuo, Feng Wei (Taiwan Semiconductor Manufacturing Company (TSMC))
Siriburanon, Teerachot (University College Dublin)
Babaie, M. (TU Delft Electronics)
Staszewski, R.B. (University College Dublin)

Date

2018

Abstract

This paper proposes an ultra-low-voltage (ULV) fractional-N all-digital PLL (ADPLL) powered from a single 0.5-V supply. While its digitally controlled oscillator (DCO) runs directly at 0.5 V, an internal switched-capacitor dc-dc converter ``doubles'' the supply voltage to all the digital circuitry and particularly regulates the time-to-digital converter (TDC) supply to stabilize its resolution, thus maintaining fixed in-band phase noise (PN) across process, voltage, and temperature (PVT). The ADPLL supports a two-point modulation and forms a Bluetooth low-energy (BLE) transmitter realized in 28-nm CMOS. It maintains in-band PN of -106 dBc/Hz [figure of merit (FoM) of -239.2 dB] and rms jitter of 0.86 ps while dissipating only 1.6 mW at 40-MHz reference. The power consumption reduces to 0.8 mW during the BLE transmission when the DCO switches to open loop.

Subject

All-digital PLL (ADPLL)
and temperature (PVT) insensitive
Bluetooth
Bluetooth low energy (BLE)
Calibration
Clocks
Delays
digitally controlled oscillator (DCO)
Internet of Things (IoT)
Oscillators
Phase locked loops
process
regulator
switched-capacitor (SC) dc-dc doubler.
voltage
Voltage control