A Low Supply Voltage All-Digital Phase-Locked Loop With a Bootstrapped and Forward Interpolation Digitally Controlled Oscillator

An all-digital phase-locked loop (ADPLL) with a multiphase digitally controlled oscillator (DCO) incorporating the bootstrapped and interpolated schemes is proposed in this paper. The bootstrapped ring oscillator can boost the output voltage to a higher level than the supply voltage. Thus, the oscil...

Full description

Saved in:
Bibliographic Details
Published in:IEEE access 2021, Vol.9, p.39717-39726
Main Authors: Liu, Jen-Chieh, Li, Yu-Ping
Format: Article
Language:English
Subjects:
Bootstrapped
Circuit design
CMOS
Cost analysis
Design optimization
digitally controlled oscillator (DCO)
Electric potential
Interpolation
Inverters
Jitter
Leakage currents
Microprocessors
MIM capacitors
Multiphase
Phase locked loops
phase-locked loop (PLL)
Power consumption
Power demand
Varactors
Vibration
Voltage
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:An all-digital phase-locked loop (ADPLL) with a multiphase digitally controlled oscillator (DCO) incorporating the bootstrapped and interpolated schemes is proposed in this paper. The bootstrapped ring oscillator can boost the output voltage to a higher level than the supply voltage. Thus, the oscillator can be operated in low-supply-voltage applications. MOS varactor is used in the bootstrapped capacitor to reduce the area cost. Circuit analysis and simulated verification were performed for an optimized design. The interpolated DCO has multiphase outputs and a high operating frequency. The test chip was implemented in a 90-nm CMOS process, and the core area was 60\times 117\,\,\mu \text{m}^{2} . The power consumptions at 1160 MHz and 20 MHz were 912.6~\mu \text{W} (at 0.6 V) and 2.94~\mu \text{W} (at 0.2 V), respectively. In the worst-case jitter performance, the root mean square (RMS) jitters were less than 0.42%.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2021.3064378