A low-leakage open-loop frequency synthesizer allowing small-area on-chip loop filter
2009 (English)In: IEEE Transactions on Circuits and Systems II: Express Briefs, ISSN 1549-7747, Vol. 56, no 3, 195-199 p.Article in journal (Refereed) Published
A frequency synthesizer targeting low-power packet-based frequency-shift-keying (FSK) applications using open-loop modulation of the oscillator is presented. Unlike conventional implementations, the proposed synthesizer is open both when transmitting and receiving data. It is, therefore, possible to use a wide loop-filter bandwidth without violating the noise or spurious requirements. A wideband loop-filter can be implemented using small component values, allowing an on-chip loop filter. To handle the frequency drift associated with open-loop implementations, a low-leakage charge pump is proposed. The synthesizer is implemented using a 0.18-mu m CMOS process. The total power consumption is 9 mW, and the circuit area including the voltage-controlled oscillator (VCO) inductors and on-chip loop-filter is 0.32 mm(2). The measured frequency drift indicates a leakage current of below 2 fA.
Place, publisher, year, edition, pages
2009. Vol. 56, no 3, 195-199 p.
Frequency modulation; frequency stability; frequency synthesizers; leakage currents; phase locked loops; phase noise; transceivers
Other Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-8281DOI: 10.1109/TCSII.2009.2015366ISI: 000264628900003ScopusID: 2-s2.0-64049106123OAI: oai:DiVA.org:kth-8281DiVA: diva2:13561
QC 20100816. Uppdaterad från manuskript till artikel (20100816).2008-04-252008-04-252010-08-17Bibliographically approved