Lect25_RF Transceivers Case Studies II

Lect25_RF Transceivers Case Studies II - ECE 620...

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ECE 620 Introduction to RF Integrated Circuits Prof. Waleed Khalil Lecture RF Transceivers: Case Studies II 25 1
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WCDMA TX Leakage and Out-of-Band Blockers (1/2) 2 f RF 2095 MHz 2050 MHz 2025 MHz -96 dBm -44 dBm -30 dBm -15 dBm BW 3.8MkHz WCDMA Out-of-Band Blockers Noise Floor=-108 dBm RX Band:=2.11-2.17 GHz 2185 MHz 2230 MHz 2255 MHz -44 dBm -30 dBm -15 dBm P TX = +24dBm 1940 MHz @ANT 3 rd order intermodulation between TX signal and out-of- band blocker dictates RX IIP3 spec TX signal at 1940MHz and RX out-of-band blocker at 2025MHz IM3 at (2*2025-1940)= 2110 MHz (RX in-band)
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WCDMA TX Leakage and Out-of-Band Blockers (2/2) 3 LNA PA 2025 1940 @ANT P TX = 24dBm P RXB = -15dBm 2110 P RX = -96dBm 2025 1940 @LNA Ainput P TX = -20dBm P RXB = -44dBm 2110 P RX = -98dBm 2025 1940 @RX Output Referred to LNA Input 2110 1855 IM3 Noise Floor IM3 product needs to be 10 dB below noise floor = -118dBm IM3 (2f 2 -f 1 )= 2P 2 +P 1 -2IIP3 IIP3=0.5*(+118+2*(-44) -20)= +5 dBm
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This note was uploaded on 11/21/2011 for the course ECE 620 taught by Professor Khalil during the Fall '11 term at Ohio State.

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Lect25_RF Transceivers Case Studies II - ECE 620...

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