## Abstract

This article presents an integrated microwave true time delay (TTD) phase shifter with active amplitude control for wireless frontends. The phase control is based on distributed digital control of wave propagation in an artificial transmission line. We implement a chip prototype based on this concept in the TSMC 65 nm process. The measured group delay resolution is <inline-formula> <tex-math notation="LaTeX">$0.28$</tex-math> </inline-formula> ps with a loss variation of less than <inline-formula> <tex-math notation="LaTeX">$1$</tex-math> </inline-formula> dB. The active tuning enables up to <inline-formula> <tex-math notation="LaTeX">$15$</tex-math> </inline-formula> dB amplitude control and <inline-formula> <tex-math notation="LaTeX">$\leq$</tex-math> </inline-formula> <inline-formula> <tex-math notation="LaTeX">$-27$</tex-math> </inline-formula> dB of reverse isolation across the Ku-band. The proposed structure enables broadband linear delay control for multiband phased arrays.

Original language | English (US) |
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Pages (from-to) | 1-4 |

Number of pages | 4 |

Journal | IEEE Microwave and Wireless Technology Letters |

DOIs | |

State | Accepted/In press - 2024 |

### Bibliographical note

Publisher Copyright:IEEE

## Keywords

- Bandwidth
- Coplanar waveguide
- Delay lines
- Delays
- digitally controlled
- Frequency measurement
- integrated
- phase shifter
- Prototypes
- Semiconductor device measurement
- true time delay (TTD)
- Tuning