A 15-40 GHz CMOS true-time delay circuit for UWB multi-antenna systems

Sanggu Park, Sanggeun Jeon

Research output: Contribution to journalArticlepeer-review

53 Citations (Scopus)


A CMOS true-time delay (TTD) circuit operating from 15 to 40 GHz is presented for integrated UWB multi-antenna systems. The TTD circuit employs a distributed active switching structure in which eight cascode switches are distributed along transmission lines, leading to 3-bit variations of the group delay. The size of the switches and the characteristic impedance of the transmission lines are carefully scaled so as to minimize loss variation among the different delay states, while maintaining flat delay performance over a wide bandwidth. The circuit is implemented in a bulk 0.13-μm CMOS technology and exhibits a total variable group delay of 40 ps with an average resolution of 5 ps from 15 to 40 GHz. The insertion loss was 14 dB with a maximum RMS variation of 1.6 dB, while the input and output return loss was better than 10 dB over the operating bandwidth.

Original languageEnglish
Article number6461436
Pages (from-to)149-151
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number3
Publication statusPublished - 2013


  • CMOS
  • multi-antenna systems
  • scaled active switches
  • true-time delay (TTD)
  • ultra-wideband (UWB)

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering


Dive into the research topics of 'A 15-40 GHz CMOS true-time delay circuit for UWB multi-antenna systems'. Together they form a unique fingerprint.

Cite this