Lect26_RF Transceivers Case Studies III

Lect26_RF Transceivers Case Studies III - ECE 620...

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ECE 620 Introduction to RF Integrated Circuits Prof. Waleed Khalil Lecture RF Transceivers: Case Studies III 26 1
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TX Noise in RX (1/2) 2 Duplex Isolation 1920 MHz 1980 MHz TX Band 2110 MHz 2170 MHz RX Band Gain 0 dB -44 dB LNA PA TX-to-ANT ANT-to-RX TX-to-RX TX-to-RX 1920 MHz 1980 MHz TX Band 2110 MHz 2170 MHz RX Band 0 dB -2 dB -44 dB ANT-to-RX 1920 MHz 1980 MHz TX Band 2110 MHz 2170 MHz RX Band 0 dB -2 dB -42 dB TX-to-ANT -46 dB
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TX Noise in RX (2/2) 3 After duplexer, TX noise at RX band is -171 dBm/Hz In order not to degrade RX NF, TX noise needs to be 10 dB below noise floor (i.e. -184 dBm/Hz) Mitigation options TX interstage filter ($cost and insertion loss in TX path) Improve TX phase noise (better VCO design) PSD TX Band 26 dBm RX Band -153 dBc/Hz (TX Phase Noise) 136 dBm/Hz -20 dBm -127 dBm/Hz -171 dBm/Hz 44 dB (Dplx Iso) 46 dB(Dplx Iso) RX Noise Floor (-174 dBm/Hz) P TX @ LNAin LNA PA P TX @ PAout TX Filter
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Polar Transmitters (1/3) 4 f ref A(t) φ (t) PA D/A
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Lect26_RF Transceivers Case Studies III - ECE 620...

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