Transcription of RF Basics, RF for Non-RF Engineers - Texas Instruments
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RF Basics, RF for Non-RF Engineers - Texas Instruments
2006 Texas Instruments Inc, Slide 1RF Basics, RF for Non-RF EngineersDag GriniProgram Manager, Low Power WirelessTexas Instruments 2006 Texas Instruments Inc, Slide 2 Basics Basic Building Blocks of an RF System RF Parameters and RF Measurement Equipment Support / getting startedAgenda 2006 Texas Instruments Inc, Slide 3 Definitions dBm relative to 1 mW dBc relative to carrier 10mW = 10dBm, 0dBm = 1mW -110dBm = 1E-11mW = For a 50 ohm load : -110dBm is , not much! Rule of thumb: Double the power = 3 dB increase Half the power = 3 dB decrease 2006 Texas Instruments Inc, Slide 4dBm 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 LevelV = 20 log (V/1 V)[V ] = dB V Power LevelP = 10 log (P/1mW)[P ] = 25mW max. allowed radiated power in the EU SRD band >> P = 10 log (25mW/1mW) = 10 * 1,39794 dBm >> 14 dBm 2006 Texas Instruments Inc, Slide 5 Electromagnetic SpectrumSource: RADIATIONVHF = VERY HIGH FREQUENCYUHF = ULTRA HIGH FREQUENCYSHF = SUPER HIGH FREQUENCY EHF = EXTREMELY HIGH FREQUENCY4G CELLULAR56-100 GHzISM bandISM bands315-915 GHzISM= Industrial, Scientific and MedicalUWB= Ultra Wide Band 2006 Texas Instruments Inc, Slide 6 Frequency Spectrum Allocation Unlicensed ISM/SRD bands: USA/Canada: 260 470 MHz(FCC Part ; ) 902 928 MHz(FCC Part ; ) 2400 MHz(FCC Part ; ) Europe: MHz(ETSI EN 300 220) MHz(ETSI EN 300 220) 2400 M
t is the transmitter, G r is the receiver antenna gain Lambda is the wavelength D is the distance between transmitter and receiver, or the range 2 2 2 (4) d PG P t r r π λ P r P t G t G r 20logd = 4 20log ⎟− ⎠ ⎞ ⎜ ⎝ ⎛ = + + + π λ or
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