A Dual Band Fractional- N Frequency Synthesizer with a Self-Calibrated Charge Pump for WLAN Standards

M. Azadbakht, A. Sahafi, E.N. Aghdam

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Abstract

This work presents a fully integrated fractional-N frequency synthesizer that covers the entire frequency bands specified in the IEEE 802.11 a/b/g/n. In this paper, the effects of charge pump (CP) gain mismatch on spectral purity of local oscillator signal is studied theoretically and a new high precision self-calibrated CP is presented for alleviating the nonidealities. The idea is implemented in a 0.18-μm standard CMOS technology. According to post layout simulation, the proposed calibration circuit demonstrates an excellent matching in the CP currents in a wide voltage range. By using this technique, the average of close-in phase noise of the designed frequency synthesizer is suppressed by more than 12dBc. The active whole chip die area is 0.475mm 2 and the power dissipation from a 1.8-V DC supply is 17.3-20.6mW.

OriginalsprogEngelsk
Artikelnummer1850131
TidsskriftJournal of Circuits, Systems and Computers
Vol/bind27
Udgave nummer8
ISSN0218-1266
DOI
StatusUdgivet - 1. jul. 2018

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