Name
Abstract | ||
|---|---|---|
This article presents a fractional-N sampling type-I phase-locked loop (PLL). To overcome the impairments of a conventional type-I PLL, namely the frequency-tuning-dependent time offset and the narrow range of the sampling phase detector (SPD), which would prevent fractional-N synthesis, a novel digital phase error correction (DPEC) technique, operating in the background, is introduced, which provides robust low-jitter performance. Besides, a novel frequency locking method is presented, which provides fast lock and seamless hand-off to main PLL operation. The PLL has been fabricated in a 28-nm CMOS technology process, and it synthesizes frequencies from 11.9 to 14.1 GHz, achieving an rms jitter of 58.2 and 51.7 fs (integrated into the 1 kHz–100 MHz bandwidth) for a fractional-N and integer-N channel, respectively. The reference spur is as low as −73.5 dBc, while the worst case near-integer fractional spurs are lower than −63.2 dBc. With a power consumption of 18 mW, the jitter-power figure of merit is −252.1 dB (fractional-N) and −253.3 dB (integer-N). The locking time is below 9
<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mu \text{s}$ </tex-math></inline-formula>
for a 1-GHz frequency step. The synthesizer occupies 0.16 mm
<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup>
, including decoupling capacitors. |
Year | DOI | Venue |
|---|---|---|
2022 | 10.1109/JSSC.2021.3123827 | IEEE Journal of Solid-State Circuits |
Keywords | DocType | Volume |
5G,digital-to-time converter (DTC),fractional-N,frequency synthesizer,low jitter,phase-locked loop (PLL),sampling phase detector (SPD),type-I | Journal | 57 |
Issue | ISSN | Citations |
2 | 0018-9200 | 2 |
PageRank | References | Authors |
0.36 | 0 | 8 |
Name | Order | Citations | PageRank |
|---|---|---|---|
| Mario Mercandelli | 1 | 3 | 0.71 |
| Alessio Santiccioli | 2 | 4 | 1.06 |
| Angelo Parisi | 3 | 3 | 0.71 |
| Luca Bertulessi | 4 | 2 | 0.36 |
| Dmytro Cherniak | 5 | 2 | 0.36 |
| Andrea Leonardo Lacaita | 6 | 2 | 0.36 |
| Carlo Samori | 7 | 349 | 39.76 |
| Salvatore Levantino | 8 | 2 | 0.70 |