RF - slap127 - RF Basics, RF for Non-RF Engineers

RF - slap127 - RF Basics, RF for Non-RF Engineers - RF...

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© 2006 Texas Instruments Inc, Slide 1 RF Basics, RF for Non-RF Engineers Dag Grini Program Manager, Low Power Wireless Texas Instruments
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© 2006 Texas Instruments Inc, Slide 2 •Basics • Basic Building Blocks of an RF System • RF Parameters and RF Measurement Equipment • Support / getting started Agenda
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© 2006 Texas Instruments Inc, Slide 3 Definitions dBm – relative to 1 mW dBc – relative to carrier 10mW = 10dBm, 0dBm = 1mW -110dBm = 1E-11mW = 0.00001nW For a 50 ohm load : -110dBm is 0.7uV, i.e. not much! Rule of thumb: ± Double the power = 3 dB increase ± Half the power = 3 dB decrease
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© 2006 Texas Instruments Inc, Slide 4 dBm to Watt About dBm and W ± Voltage Ratio aV = 20 log (P2/P1) [aV] = dB ± Power Ratio aP = 10 log (P2/P1) [aP] = dB ± Voltage Level V‘ = 20 log (V/1μV) [V‘] = dBμV ± Power Level P‘ = 10 log (P/1mW) [P‘] = dBm e.g. 25mW max. allowed radiated power in the EU SRD band >> P‘ = 10 log (25mW/1mW) = 10 * 1,39794 dBm >> 14 dBm
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© 2006 Texas Instruments Inc, Slide 5 Electromagnetic Spectrum Source: JSC.MIL SOUND LIGHT RADIO HARMFUL RADIATION VHF = VERY HIGH FREQUENCY UHF = ULTRA HIGH FREQUENCY SHF = SUPER HIGH FREQUENCY EHF = EXTREMELY HIGH FREQUENCY 4G CELLULAR 56-100 GHz 2.4 GHz ISM band ISM bands 315-915 MHz UWB 3.1-10.6 GHz ISM = Industrial, Scientific and Medical UWB = Ultra Wide Band
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© 2006 Texas Instruments Inc, Slide 6 Frequency Spectrum Allocation Unlicensed ISM/SRD bands: USA/Canada: ± 260 – 470 MHz (FCC Part 15.231; 15.205) ± 902 – 928 MHz (FCC Part 15.247; 15.249) ± 2400 – 2483.5 MHz (FCC Part 15.247; 15.249) Europe: ± 433.050 – 434.790 MHz (ETSI EN 300 220) ± 863.0 – 870.0 MHz (ETSI EN 300 220) ± 2400 – 2483.5 MHz (ETSI EN 300 440 or ETSI EN 300 328) Japan: ± 315 MHz (Ultra low power applications) ± 426-430, 449, 469 MHz (ARIB STD-T67) ± 2400 – 2483.5 MHz (ARIB STD-T66) ± 2471 – 2497 MHz (ARIB RCR STD-33) ± ISM = Industrial, Scientific and Medical ± SRD = Short Range Devices
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© 2006 Texas Instruments Inc, Slide 7 ISM/SRD License-Free Frequency Bands
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© 2006 Texas Instruments Inc, Slide 8 RF Communication Systems Simplex RF System ± A radio technology that allows only one-way communication from a transmitter to a receiver ± Examples: FM radio, Pagers, TV, One-way AMR systems TX TX TX TX TX TRX RX RX
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© 2006 Texas Instruments Inc, Slide 9 RF Communication Systems Half-duplex RF Systems ± Operation mode of a radio communication system in which each end can transmit and receive, but not simultaneously. ± Note: The communication is bidirectional over the same frequency, but unidirectional for the duration of a message. The devices need to be transceivers. Applies to most TDD and TDMA systems. ± Examples: Walkie-talkie, wireless keyboard mouse
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© 2006 Texas Instruments Inc, Slide 10 RF Communication Systems Full-duplex RF Systems ± Radio systems in which each end can transmit and receive simultaneously ± Typically two frequencies are used to set up the communication channel.
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This document was uploaded on 02/08/2012.

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RF - slap127 - RF Basics, RF for Non-RF Engineers - RF...

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