Name
Title | ||
|---|---|---|
An Ultra-Fast And High-Precision Vco Frequency Calibration Technique For Fractional-N Frequency Synthesizers |
Abstract | ||
|---|---|---|
A novel VCO auto frequency calibration (AFC) technique is presented in this paper. It provides ultra-fast and high-precision search for an optimum VCO discrete tuning curve among a group of frequency subbands in the PLL frequency synthesizer. The calibration circuit consists of a table of frequency (TOF) and a finite state machine (FSM). Asynchronous work of TOF and FSM makes it possible to realize ultra-fast and high-precision calibration simultaneously. TOF affords the high-precision of the calibration and FSM with a high-speed clock offers the ultra-fast search. A 2.8 G-3.5 GHz Fractional-N PLL incorporating the proposed calibration technique is implemented in 55 nm CMOS process. The measured calibration time for a 5-bit capacitor bank is 90 ns for a frequency resolution of 203 KHz. Such small calibration time significantly reduces the effects of calibration time on the total lock time of the PLL. |
Year | DOI | Venue |
|---|---|---|
2020 | 10.1587/elex.17.20200066 | IEICE ELECTRONICS EXPRESS |
Keywords | DocType | Volume |
automatic frequency calibration, frequency synthesizer, PLL, CMOS | Journal | 17 |
Issue | ISSN | Citations |
7 | 1349-2543 | 0 |
PageRank | References | Authors |
0.34 | 0 | 3 |
Name | Order | Citations | PageRank |
|---|---|---|---|
| Qi Liu | 1 | 0 | 0.34 |
| Yebing Gan | 2 | 3 | 0.76 |
| Tianchun Ye | 3 | 30 | 8.32 |