NDLI: Adaptive gm3 cancellation linearisation and its application to wide-tunable Gm-C filter design

Content Provider	IET Digital Library
Author	Rezaei, Farzan
Abstract	This paper presents an adaptive g m3 cancellation for linearisation of operational transconductance amplifier (OTA) and its application to design of a wide tunable Gm-C filter. g m3 cancellation through paralleling triode- and subthreshold-mode transconductors makes good linearisation, but only in a limited range of tuning voltage. An auxiliary circuit is employed to adaptively change the operating point of subthreshold-mode transconductor such that to keep linearisation throughout the tuning range. By this way, the linearity of OTA is significantly improved in overall transconductance tuning range from 18 to 289 μA/V. While by applying 0.6 Vpp input voltage at 1 MHz the total harmonic distortion (THD) of conventional OTA lies between −75.1 and −44.4 dB, it reduces to lie between −83.3 and −57.4 dB in the proposed OTA. Using the proposed OTA, a third-order low-pass Gm-C filter is designed in 0.18 μm CMOS technology. The cutoff frequency of filter is tunable from 1.73 to 27.25 MHz, thus, can be applicable to support WCDMA, WLAN (IEEE 802.11a/b/g/n) and WiMAX standards in multi-mode direct conversion receivers. The third-order intercept point of filter is between 7.1 and 13.7 dBm in different tuning conditions.
Starting Page	478
Ending Page	486
Page Count	9
ISSN	1751858X
Volume Number	11
e-ISSN	17518598
Issue Number	Issue 5, Sep (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-cds/11/5
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-cds.2016.0474
Journal	IET Circuits, Devices & Systems
Publisher Date	2017-04-04
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Adaptive Gm3 Cancellation Linearisation Amplifiers Auxiliary Circuit CMOS Integrated Circuit CMOS Technology Filter And Other Network Frequency 1 MHz Harmonic Distortion Integrated Circuit Design Layout Low-pass Filter Modelling And Testing Multimode Direct Conversion Receiver Operational Amplifier Operational Transconductance Amplifier OTA Paralleling Triode Semiconductor Integrated Circuit Design Size 0.18 Mum Subthreshold-mode TransConductor THD Third-order Intercept Point Third-order Low-pass Gm-C Filter Total Harmonic Distortion Triodes Tuning Voltage Vacuum Tubes Voltage 0.6 V WCDMA Wide-tunable Gm-C Filter Design WiMAX Standards WLAN
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Electrical and Electronic Engineering

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