## Abstract

This work presents a mm-wave signal generation method that provides background phase tuning and self-alignment between adjacent sources. This technique is based on direct monitoring of the mm-wave signal and provides phase tuning through a baseband feedback loop. We present the theory of the concept, provide the design methodology, and validate the proposed method with a two-element prototype in a 65-nm CMOS process. The prototype has a chip area of 1.3 mm <inline-formula> <tex-math notation="LaTeX">$\times$</tex-math> </inline-formula> 2 mm and consumes a total dc power of 258 mW. Chip measurements demonstrate a phase tuning range of 140<inline-formula> <tex-math notation="LaTeX">$^{\circ}$</tex-math> </inline-formula> at 35 GHz with 20<inline-formula> <tex-math notation="LaTeX">$^{\circ}$</tex-math> </inline-formula>/step and 3.5<inline-formula> <tex-math notation="LaTeX">$^{\circ}$</tex-math> </inline-formula> of rms phase error. The measured phase switching time is 20 ns. The measured phase noise at 1-MHz offset is below <inline-formula> <tex-math notation="LaTeX">$-$</tex-math> </inline-formula>117 dBc/Hz across phase settings, and the accumulated jitter is 86 fs. These results are consistent with theory and simulation. This work provides a phase alignment technique for large-scale mm-wave phased arrays.

Original language | English (US) |
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Pages (from-to) | 1-14 |

Number of pages | 14 |

Journal | IEEE Journal of Solid-State Circuits |

DOIs | |

State | Accepted/In press - 2022 |

### Bibliographical note

Publisher Copyright:IEEE

## Keywords

- Detectors
- Distribution network
- Frequency measurement
- mm-wave
- phase control
- Phase frequency detectors
- phased array
- Phased arrays
- Power transmission lines
- Resonant frequency
- scalable
- Transmission line measurements