A broadband Variable Gain Amplifier for the Square Kilometer Array

  • Wu G
  • Belostotski L
  • Haslett J
  • 8


    Mendeley users who have this article in their library.
  • 3


    Citations of this article.


In this paper, an inductorless broadband linear-in-dB Variable-Gain Amplifier (VGA) circuit for use in the Square Kilometer Array (SKA) is presented. A two-transistor topology, which realizes a linear-in-dB function, is used to design a differential VGA. The VGA is both input and output power matched to 100Ω differential sources and loads. The design is fabricated in ST 65nm CMOS technology with a 1V power supply. Measurement results show that the VGA has a 25dB variable gain range, input P1dB of -25dBm to -32dBm with control voltage ranging from 0.5V to 1.0V, and is designed to work in a frequency range from 0.7GHz to 1.4GHz, which is the frequency range of the mid-band SKA receiver. The total power consumption of the VGA is 1mW with another 6mW consumed by an input-match circuit and 1mW consumed by an output buffer circuit.

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document


  • Ge Wu

  • Leonid Belostotski

  • James W. Haslett

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free