An all-digital phase-locked-loop with a robustness enhanced dual-mode DCO
2017
Online
Elektronische Ressource
An all-digital-phase-locked-loop (ADPLL) with a dual-mode Class-A/Class-C Digital-controlled-oscillator (DCO) is presented in this letter. During the start-up phase, the DCO operates in the Class-A mode with increasing tail current. A low-power amplitude-to-pulse-converter (APC) is proposed to detect the oscillating amplitude of the DCO. After the start-up, the DCO switches to the Class-C mode with reduced tail current, resulting in better phase noise and lower power consumption. The ADPLL with the proposed DCO is implemented in a 65-nm CMOS technology. The Class-C mode DCO exhibits a phase noise of −123.3 dBc/Hz at 1-MHz offset with a 2.7-GHz carrier frequency. Measured results show about a 2.9-dB phase noise improvement at 1-MHz offset among the tuning range of 2.5–2.9 GHz, compared to the Class-A DCO under the same power consumption. The figure-of-merit (FOM) and FOM including the tuning range (FOMT) of the DCO is 188.7 and 192.1, respectively.
Funding text: This work has been supported by Science and Technology Commission of Shanghai Municipality (NO. 14510711500, NO. 13441902800), and by NSFC program (NO. 61571137).QC 20170306
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An all-digital phase-locked-loop with a robustness enhanced dual-mode DCO
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Veröffentlichung: | 2017 |
Medientyp: | Elektronische Ressource |
DOI: | 10.1002.mop.30278 |
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