A UHF CMOS Variable Gain LNA with Wideband Input Impedance Matching and GSM Interoperability

A UHF CMOS variable gain low-noise amplifier (LNA) is designed for mobile digital TV tuners. The proposed LNA adopts a feedback topology to cover a wide frequency range from 474 to 868 MHz, and it supports the notch filter function for the interoperability with the GSM terminal. In order to handle h...

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Bibliographic Details
Published inJournal of semiconductor technology and science Vol. 17; no. 4; pp. 499 - 504
Main Authors Woo, Doo Hyung, Nam, Ilku, Lee, Ockgoo, Im, Donggu
Format Journal Article
LanguageKorean
Published 2017
Subjects
DVB-H/T
feedback
CMOS
mobile TV tuner
variable gain
GSM interoperability (IOP)
LNA
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Summary:A UHF CMOS variable gain low-noise amplifier (LNA) is designed for mobile digital TV tuners. The proposed LNA adopts a feedback topology to cover a wide frequency range from 474 to 868 MHz, and it supports the notch filter function for the interoperability with the GSM terminal. In order to handle harmonic distortion by strong interferers, the gain of the proposed LNA is step-controlled while keeping almost the same input impedance. The proposed LNA is implemented in a $0.11{\mu}m$ CMOS process and consumes 6 mA at a 1.5 V supply voltage. In the measurement, it shows the power gain of greater than 16 dB, NF of less than 1.7 dB, and IIP3 of greater than -1.7 dBm for the UHF band.
Bibliography:KISTI1.1003/JNL.JAKO201725650933892
ISSN:1598-1657