Power Measurement Basics
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- Baldric Russell Fletcher
- 5 years ago
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1 Back to Basics
2 Objectives On completion of this module, you will be able to: Explain the importance of power measurements Define the three basic types of power measurements Describe the power meter/sensor measurement method Explain the two most prevalent sensor technologies Describe advanced measurements used for the latest RF & microwave applications Calculate power measurement uncertainty Outline Agilent s broad range of power measurement solutions
3 Agenda Importance of Power Measurements Average, Peak and Pulse Power Power Meter & Sensor Measurement Method Sensor Technologies Agilent Power Measurement Solutions Time-Gated Power Measurements Advanced Power Measurements Measurement Uncertainty, Standards and Traceability Agilent Power Sensor Selection Guides (Appendix)
4 Signal Power Levels are Critical Too low: Signal buried in noise Too high: Nonlinear distortion......or even worse!
5 Importance of Power Measurements Critical to specified performance at every level of a system Many measurements made in design and manufacturing Measuring equipment and techniques must be: Accurate Repeatable Traceable Convenient
6 Why Not Measure Voltage? DC Low Frequency + V ± Z S R L P = IV = V 2 /R Z S V R L I I High Frequency Z S Z O R L I and V vary with position Power is constant AC component of power V Inc Amplitude P DC component of power V Ref I t V
7 Agenda Importance of Power Measurements Average, Peak and Pulse Power Power Meter & Sensor Measurement Method Sensor Technologies Agilent Power Measurement Solutions Time-Gated Power Measurements Advanced Power Measurements Measurement Uncertainty, Standards and Traceability Agilent Power Sensor Selection Guides (Appendix)
8 Units and Definitions Power = energy transferred per unit time Basic power unit is the watt (W) 1 W = 1 A x 1 V A logarithmic (decibel) scale is often used to compare two power levels Relative power in decibels (db) = 10 log(p 2 /P 1 ) Absolute power is expressed by assigning a reference level to P 1 Power (dbm) = 10 log(p/1 mw)
9 Average Power AM Average over many modulation cycles Pulsed Average over many pulse repetitions t
10 Pulse Power Power Pulse Power = Average Power/Duty Cycle Rectangular pulse Constant duty cycle A (pulse width) Duty Cycle = A B B (pulse repetition interval) Time
11 Envelope Power and Peak Envelope Power Instantaneous Power Peak Envelope Power Peak Power Envelope Power
12 Agenda Importance of Power Measurements Average, Peak and Pulse Power Power Meter & Sensor Measurement Method Sensor Technologies Agilent Power Measurement Solutions Time-Gated Power Measurements Advanced Power Measurements Measurement Uncertainty, Standards and Traceability Agilent Power Sensor Selection Guides (Appendix)
13 Instruments That Measure RF & Microwave Power Power Meter and Sensor Network Analyzer ± 0. 0X db > 70 dbm Vector Signal Analyzer ± 0. X db or greater Frequency selective Spectrum Analyzer
14 The Power Meter and Sensor Method RF power Power Sensor Thermistor Thermocouple Diode Detector DC or low-frequency equivalent Power Meter Display (dbm or W)
15 Agenda Importance of Power Measurements Average, Peak and Pulse Power Power Meter & Sensor Measurement Method Sensor Technologies Agilent Power Measurement Solutions Time-Gated Power Measurements Advanced Power Measurements Measurement Uncertainty, Standards and Traceability Agilent Power Sensor Selection Guides (Appendix)
16 Thermistors One of the earliest types of power sensors Have been replaced in most applications by thermocouples and diode detectors Still used for power transfer standards in metrology applications
17 Thermocouples A junction of two dissimilar metals generates a voltage related to temperature Junction temperature is directly related to RF power RF Power C c Cold Junction RF Input Hot Cold Hot Junction Thin-Film Thermocouples C b To DC Voltmeter
18 Diode Detectors R s + V s R matching C b V o -
19 Power Sensor and Meter Signal Path Power Sensor Power Meter RF Diode Detector DC Chopper AC BPF Ranging Synchronous Detector LPF ADC AUTOZERO 220 Hz Squarewave Generator DAC µprocessor
20 Square-Law Region of Diode Sensors Linear Region V O (log) V 2 O = nv = S n P IN Square-Law Region Noise Floor 0.1 nw 70 dbm 50 db P IN 0.01 mw 20 dbm
21 Wide Dynamic Range CW Power Sensors 70 to + 20 dbm = 90 db Dynamic Range Calibration Data
22 Agenda Importance of Power Measurements Average, Peak and Pulse Power Power Meter & Sensor Measurement Method Sensor Technologies Agilent Power Measurement Solutions Time-Gated Power Measurements Advanced Power Measurements Measurement Uncertainty, Standards and Traceability Agilent Power Sensor Selection Guides (Appendix)
23 P-Series, EPM-P and EPM Series Power Meters P-Series Power Meters Peak, average, peak-to-average ratio; time-gated measurements; rise time, fall time and pulse width; 30 MHz video bandwidth (N1911A/12A) EPM-P Series Power Meters Peak, average, peak-to-average ratio; time-gated measurements, 5 MHz video bandwidth (E4416A/17A) EPM Series Power Meters Average power measurements (E4418B/19B)
24 8480, E-Series and P-Series Power Sensors 8480 Series (Diode and Thermocouple) Average power from 70 to +44 dbm; 100 khz to 110 GHz; unlimited video BW Typical dynamic range of 50 db E-Series (Diode) E441X: 90 db dynamic range; CW only E9300: 80 db dynamic range; average power of any signal type; no BW limitation E9320: peak and average power from 50 MHz to 18 GHz; 5 MHz video BW P-Series (Diode) N192XA: peak and average from 50 MHz to 40 GHz; 30 MHz video BW
25 E9300 Average Power Sensor Technology Low-Power Path ( 60 to 10 dbm) RF Input High-Power Path ( 10 to +20 dbm) 80 db dynamic range with any signal type Two-path design Diode stack/attenuator/diode stack topology Automatic path switching
26 E9320: Two Sensors in One Package Sensor Diode Bulkhead Average-Only Path RF IN 50 ohms 3 db Load Filter * (300 khz, 1.5 MHz, 5 MHz lowpass) Chopper Switched Gain Preamp 50-ohm load Thermistor -t Av. PATH ISOLATE Normal (Peak) Path CW Differential Amp Variable Gain Differential DC Coupled Amplifier * (300 khz, 1.5 MHz, 5 MHz) PEAK AUTO-ZERO * Bandwidth is sensor dependent Thermistor Bias I 2 C Buffer Gain / Mode Control Sensor ID E 2 PROM GAIN SELECT SERIAL BUS
27 Agenda Importance of Power Measurements Average, Peak and Pulse Power Power Meter & Sensor Measurement Method Sensor Technologies Agilent Power Measurement Solutions Time-Gated Power Measurements Advanced Power Measurements Measurement Uncertainty, Standards and Traceability Agilent Power Sensor Selection Guides (Appendix)
28 Time-Gated Power Measurements EDGE signal (GSM) Peak, average and peak-to-average ratio of a single burst
29 Sensors for Time-Gated Measurements Sensor rise/fall time requirements For characterizing overshoot: < 1/8 signal rise time For average power: same as signal rise time E9320 peak/average sensors 200 ns rise time (typical) TDMA, CDMA and W-CDMA wireless formats P-Series wideband power sensors < 13 ns rise time and fall time Radar and pulsed component test
30 Triggering and Measurement Capabilities Ext Trigger Delay Start 1 EPM-P and P-Series Power Meters Start 2 Start 3 Length 2 Start 4 Average Length 3 Length 1 Peak Length 4 Triggers Level External GPIB
31 Agenda Importance of Power Measurements Average, Peak and Pulse Power Power Meter & Sensor Measurement Method Sensor Technologies Agilent Power Measurement Solutions Time-Gated Power Measurements Advanced Power Measurements Measurement Uncertainty, Standards and Traceability Agilent Power Sensor Selection Guides (Appendix)
32 Technology Drivers Aerospace and Defence (Radar) Digital Wireless Communications GSM (0.3 GMSK) EDGE (3/8 Shifted 8PSK) cdma2000 TDMA system Time-gated average power Fast measurements High-speed data transfer 3G technology Peak-to-average ratio CCDF
33 Peak Power Measurement System RF IN Power Sensor Video BW High-speed sampling measurement path (EPM-P/E9320) Detected envelope power High-frequency modulated signal power Key system characteristics: Sufficient video (modulation) bandwidth Wide dynamic range High-speed, continuous sampling
34 Wide Bandwidth and Fast, Continuous Sampling P-Series Power Meters and Sensors 30 MHz video bandwidth up to 40 GHz Continuous sampling at 100 Msample/s 0.5 μs/div = 50 samples per division
35 P-Series Power Meters and Sensors Key Measurements Peak, average, peak-to-average ratio; rise time, fall time and pulse width; time-gated and free-run measurements
36 P-Series Measurement Display Graphical trace setup Marker measurements and analysis MKR 1 MKR 2
37 EPM-P Analyzer Software A PC-based tool for pulse and statistical analysis CDMA, TDMA and radar signals
38 Pulse Analysis Power Pulse Top, Pulse Base, Distal, Mesial, Proximal, Peak, Average, Peak/Average Ratio, Burst Average and Duty Cycle Time and Frequency Rise Time, Fall Time, Pulse Repetition Frequency (PRF), Pulse Repetition Interval (PRI), Pulse Width and Off Time * IEEE pulse definitions and standards for video parameters applied to microwave pulse envelopes ( ANSI/IEEE Std ).
39 Statistical Analysis Statistical Functions Cumulative Distribution Function (CDF) Complementary Cumulative Distribution Function (CCDF) Probability Density CCDF Complete power characterization Helps optimize system design 0.3% For 0.3% of the time, signal power is at or above 8 db peak-to-average ratio 8 db
40 Agenda Importance of Power Measurements Average, Peak and Pulse Power Power Meter & Sensor Measurement Method Sensor Technologies Agilent Power Measurement Solutions Time-Gated Power Measurements Advanced Power Measurements Measurement Uncertainty, Standards and Traceability Agilent Power Sensor Selection Guides (Appendix)
41 Sources of Power Measurement Uncertainty Sensor and Source Mismatch Errors Power Sensor Errors Power Meter Errors Sensor Mismatch Meter
42 Sensor and Source Mismatch Signal Source Impedance Z 0 Power Sensor Power Meter Ideal impedance = Z 0 VSWR
43 Calculation of Mismatch Uncertainty Signal Source (2 GHz, 0 dbm) Power Sensor E9301A Power Meter VSWR = 1.13 VSWR = 2.0 = 0.33 SOURCE = 0.06 SENSOR = VSWR 1 VSWR 1 Mismatch Uncertainty = ± 2 x x x 100% SOURCE SENSOR = ± 2 x 0.33 x x 100% = ± 3.96%
44 Power Sensor Uncertainties Various sensor losses P i P gl Element DC Power Meter P r Power Sensor P Cal Factor : K h b = e gl P i (h e = Effective Efficiency) Printed on sensor label (8480 series) Stored in EEPROM (E-series and P-series)
45 Power Meter Instrumentation Uncertainties Power Reference Uncertainty 0.6 % Instrumentation Uncertainty 0.5 %
46 What is an Acceptable Measurement Uncertainty? Which is the smaller error: 1.0 db or ± 20%? Answer: 20%! ( 1.0 db is + 26%, 21%) Sensor and meter uncertainties are specified in percentage (linear) and db (log) Marketing Manager s Law of Small Numbers: A small-numbered uncertainty specification sounds better than a large-numbered one.
47 Calculating Power Measurement Uncertainty 1. Identify significant uncertainties Mismatch uncertainty: ± 3.96% Power linearity: ± 2.0% 1 Cal factor uncertainty: ± 1.8% 1 Power reference uncertainty: ± 0.6% 1 Instrumentation uncertainty: ± 0.5% 1 Specifications apply for an E9301A sensor and Agilent power meter over a temperature range of 25 ±10 degrees C. 2. Combine uncertainties Worst-case or Root Sum of the Squares (RSS) method
48 Worst-Case Uncertainty Worst-case situation is assumed All sources of error at their extreme values Errors add constructively In our example measurement: 3.96% + 2.0% + 1.8% + 0.6% + 0.5% = ± 8.86% Or, in log terms: % = 10 log ( ) = db 8.86% = 10 log ( ) = 0.40 db Extremely conservative
49 RSS (Root Sum of the Squares) Uncertainty* Source of Uncertainty Value (± %) Probability Distribution Divisor Standard Uncertainty u i (k=1) Source/Sensor Mismatch at 2 GHz 3.96 U -shaped Calibration Factor Uncertainty at 2 GHz 2.0 Normal Linearity at 0 dbm 1.8 Normal Power Reference Uncertainty 0.6 Normal Instrumentation Uncertainty 0.5 Normal Combined Standard Uncertainty = u c = RSS of u i * In accordance to guidelines published in the ISO Guide to the Expression of Uncertainty in Measurement and ANSI/NCSL Z , US Guide to the Expression of Uncertainty in Measurement.
50 Combined Standard Uncertainty (u c ) In our example: u c = (2.8) + (1.0) + (0.9) + (0.3) + (0.25) = 3.13% Expanded uncertainty (k = 2) = k x u c = 6.26% = 10 log ( ) = db 10 log ( ) = 0.28 db Worst-case db 0.37 db Agilent AN covers uncertainty calculations
51 National Standards and Traceability Rising Costs, Better Accuracy Thermistors are used for metrology applications National Reference Standard (Microcalorimeter) Working Standards Measurement Reference Standard Transfer Standard NIST (USA), NPL (UK) NIST (USA), NPL (UK) Commercial Standards Laboratory Manufacturing Facility General Test Equipment User
52 Summary Accurate power measurements (made with a power meter/sensor combination) are crucial in RF and microwave applications. The three fundamental power measurements are average, peak and pulse. Modern wireless and radar technologies require time-gated and advanced measurements. Agilent provides solutions for basic and advanced measurements. Measurement uncertainty is often calculated using the RSS method. The accuracy of Agilent power sensors is traceable to national standards.
53 For More Information Agilent Website URL: Agilent Literature Application Note AN , 2, 3 and 4, Fundamentals of RF and Microwave Power Measurements (Parts 1, 2, 3 and 4). Product Note, Choosing the Right Power Meter and Sensor (Lit. No E). Application Note AN 64-4D, 4 steps for making better power measurements (Lit. No E)
54 Appendix: Power Sensor Selection Guides
55 8480 Series Power Sensors 0 dbm to +44 dbm 8482B 8481B -10 to +35 dbm 8482H 8481H R8486A Q8486A V8486A W8486A -30 to +20 dbm 8482A 8483A (75 Ohm) 8481A 8485A 8487A Opt 033 Q8486D -70 to -20 dbm 8481D 8485D 8487D R8486D Opt GHz 75 GHz 50 GHz 40 GHz 33 GHz 26.5 GHz 18 GHz 6 GHz 4.2 GHz 2 GHz 50 MHz 10 MHz 100 khz
56 E-Series Wide Dynamic Range Sensors -70 to +20 dbm E4413A E4412A H33 CW Only Power Sensors -30 to +44 dbm E9300B E9301B -50 to +30 dbm E9300H E9301H H25 Modulation Average Power Sensors -60 to +20 dbm E9304A E9301A E9300A H18 H GHz 75 GHz 50 GHz 40 GHz 33 GHz 26.5 GHz 18 GHz 6 GHz 4.2 GHz 2 GHz 50 MHz 10 MHz 9 khz
57 E-Series E9320 Peak and Average Sensors -65 to +20 dbm E9321A E9325A 300 khz video bandwidth -60 to +20 dbm E9322A E9326A 1.5 MHz video bandwidth -60 to +20 dbm E9323A E9327A 5 MHz video bandwidth 110 GHz 75 GHz 50 GHz 40 GHz 33 GHz 26.5 GHz 18 GHz 6 GHz 4.2 GHz 2 GHz 50 MHz 10 MHz 9 khz
58 P-Series Wideband Power Sensors 30 MHz video bandwidth -35 to +20 dbm N1921A N1922A 110 GHz 75 GHz 50 GHz 40 GHz 33 GHz 26.5 GHz 18 GHz 6 GHz 4.2 GHz 2 GHz 50 MHz 10 MHz 9 khz
59 Quiz 1- Power is defined as; a) Energy transferred per unit time b) Amperes per second c) 10 log(v/i) 2- The db (decibel) compares two power levels on what type of scale? a) Linear b) Exponential c) Logarithmic 3- The three basic types of power measurements are: a) Average, Peak-to-Average and Envelope b) Average, Peak and Pulse c) Average, Instantaneous and Pulse
60 Quiz 4- The output power level of a high-frequency system is: a) More difficult to measure than the voltage along the transmission line b) Typically the most important factor in determining its performance c) Less useful to measure than the output voltage 5- The most accurate instrument for measuring power is: a) A vector signal analyzer b) A power meter/sensor combination c) A spectrum analyzer 6- A power sensor: a) Detects the frequency of the modulating signal b) Can only measure digitally modulated signals c) Converts RF power to a DC or low-frequency signal
61 Quiz 7- The most widely used types of sensors are: a) Diode detector and thermocouple b) Thermistor and peak power c) Thermocouple and wideband 8- Thermocouple power sensors: a) Can only measure TDMA and CDMA signals b) Can measure all types of signals c) Can only measure CW signals 9- The P-series power meters: a) Are specifically designed for average power measurements b) Provide peak and average power measurements c) Use an innovative two-path design
62 Quiz 10- The typical dynamic range of 8480 series average power sensors is: a) 90 db b) 30 db c) 50 db 11- Calibration data for individual E-series power sensors is: a) Stored in EEPROM in the sensor b) Downloadable from the Agilent Website c) Printed on the sensor label 12- The 80 db dynamic range of E-series E9300 average power sensors is achieved by the use of: a) Advanced, thin-film thermocouples b) Diode stacks and a two-path design c) A 30 MHz video bandwidth
63 Quiz 13- Time-gated measurements: a) Require the power sensor to have two measurement paths b) Cannot be used to measure radar signals c) Allow peak and average measurements to be made on a single burst 14- To make time-gated peak power measurements of TDMA-type signals: a) A power meter must have a video bandwidth of at least 100 MHz b) A power sensor must have a built-in reference oscillator c) A power sensor's rise time must be fast enough to follow the rising edge of the signal burst 15- CDMA signals: a) Require statistical power distribution information for complete characterization b) Can be fully characterized by time-gated average power measurements c) Are being superseded by 2G technology
64 Quiz 16- The EPM-P power meters: a) Should only be used with P-series sensors b) Are designed to measure only TDMA-type signals c) Have high-speed, continuous sampling of the detected power envelope 17- The most significant source of power measurement uncertainty is usually: a) Power sensor inefficiency b) Sensor and source impedance mismatch c) Instrumentation uncertainty 18- The most realistic method for combining measurement uncertainties is: a) The worst-case method b) The U-shaped probability distribution c) The Root Sum of the Squares method
65 Quiz - Answers 1- a 10- c 2- c 11- a 3- b 12- b 4- b 13- c 5- b 14- c 6- c 15- a 7- a 16- c 8- b 17- b 9- b 18- c
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