## Abstract

This letter presents a broadband digital-controlled variable gain amplifier (VGA) on 65-nm CMOS process. A body-biased digital current-steering topology is proposed to enlarge the gain control range (GCR) of the VGA under low supply voltage. For phased-array applications, a phase compensation network is added to minimize the phase shift during the gain tuning. The proposed VGA achieves a small-signal gain of 16.3/16.1 dB at 28/38 GHz with a 3-dB gain bandwidth from 25.5 to 46 GHz. The measured phase variation is 2.32<inline-formula> <tex-math notation="LaTeX">$^{\circ}$</tex-math> </inline-formula>/4.8<inline-formula> <tex-math notation="LaTeX">$^{\circ}$</tex-math> </inline-formula> with a GCR of 8.7/8.4 dB at 28/38 GHz. The phase variation of the VGA is less than 5<inline-formula> <tex-math notation="LaTeX">$^{\circ}$</tex-math> </inline-formula> and the rms phase error is less than 1.46<inline-formula> <tex-math notation="LaTeX">$^{\circ}$</tex-math> </inline-formula> over a wide frequency band of 27–43 GHz covering multiple 5G bands.

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

Number of pages | 4 |

Journal | IEEE Microwave and Wireless Components Letters |

DOIs | |

Publication status | Accepted/In press - 2022 |

## Keywords

- Broadband
- Broadband communication
- Current measurement
- Gain
- Hemorrhaging
- low phase shift
- millimeter-wave (mm-Wave)
- phased-array
- Topology
- Transistors
- Tuning
- variable gain amplifier (VGA)

## ASJC Scopus subject areas

- Condensed Matter Physics
- Electrical and Electronic Engineering