A Time-Based Frequency Band Selection Method for Phase-Locked Loops
Journal
Electronics Letters
Journal Volume
41
Journal Issue
23
Pages
31-32
Date Issued
2005-11
Author(s)
Y.-J. Lai
Abstract
High-performance phase-locked loops (PLLs) often require voltage-controlled oscillators (VCOs) employing both discrete and continuous tuning mechanisms to satisfy a wide frequency range and a low VCO tuning gain simultaneously. An auxiliary circuit is required to facilitate the selection among a group of discrete bands. An agile technique to search for an optimum VCO frequency band is proposed. The search is based on measuring the period difference between a reference and the VCO-divided signals. The VCO band selection circuit is implemented with a 10 GHz PLL in a 0.18 μm CMOS process and consumes only an extra 3 mA. The band selection time is less than 4 μs. © IEE 2005.
SDGs
Other Subjects
CMOS integrated circuits; Frequencies; Tuning; Variable frequency oscillators; Auxiliary circuits; Frequency band selection; Frequency range; Tuning gain; Phase locked loops
Type
journal article
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