The Open Electrical & Electronic Engineering Journal


ISSN: 1874-1290 ― Volume 13, 2019

On the Use of 6th-Order Tunable Complementary Metal-Oxide-Semiconductor Varactor based Filter in Ultra-Wideband Low Noise Amplifier

Farooq Khaleel, M. Nadhim Abbas*
Department of Electrical Engineering, University of Baghdad, Jadriya, Baghdad, Iraq



The plethora of the emerged radio frequency applications makes the frequency spectrum crowded by many applications and hence the ability to detect specific application’s frequency without distortion is a difficult task to achieve.


The goal is to achieve a method to mitigate the highest interferer power in the frequency spectrum in order to eliminate the distortion.


This paper presents the application of the proposed tunable 6th-order notch filter on Ultra-Wideband (UWB) Complementary Metal-Oxide-Semiconductor (CMOS) Low Noise Amplifier (LNA) utilising self-forward body bias (SFBB).


The proposed filter presents 23.5dBm minimum interferer rejection (IR) and attenuates the interferer signal from -43dBm to -67dBm at frequency 5.17GHz. In addition, the maximum IR is 40dBm and attenuates the interferer signal from -41dBm to -81dBm at frequency 5.785GHz. The proposed filter provides coarse tuning with frequency spacing (10MHz) and soft tuning with frequency spacing (1MHz). The UWB CMOS LNA consumes only 5.22mW from a supply voltage of 1.2V and presents a maximum gain of 14dB at frequency 6.25GHz in the -3dB bandwidth from 4.75GHz to 7.5GHz. In addition, the average noise figure is 3.1dB and the input insertion losses (S11) is less than -12dB along the designed bandwidth. The simulation is performed in Advanced Design System (ADS2016.01) software utilising 180nm Taiwan Semiconductor Manufacturing Company (TSMC) Berkeley Short-channel Insulated Gate Field Effect Model (BSIM3v3) model files.


The proposed method achieves high interferer power rejection with both soft and coarse tuning.

Keywords: CMOS LNA, Low power, RF receiver, TSMC, Notch filter, ADS.

Article Information

Identifiers and Pagination:

Year: 2018
Volume: 12
First Page: 21
Last Page: 33
Publisher Id: TOEEJ-12-21
DOI: 10.2174/1874129001812010021

Article History:

Received Date: 12/1/2018
Revision Received Date: 03/4/2018
Acceptance Date: 10/5/2018
Electronic publication date: 31/05/2018
Collection year: 2018

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© 2018 Khaleel and Nadhim Abbas et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Department of Electrical Engineering, University of Baghdad, Jadriya, Baghdad, Iraq; Tel: +9647712343590; E-mail:


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