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| Agilent 423B, 8470B, 8472B, 8473B/C Low Barrier Schottky Diode Detectors Data Sheet * * * * * Agilent 423B Excellent broadband flatness Low broadband SWR High burnout protection Environmentally rugged Field replaceable diode elements I 50 A/div Typical LBSD Typical Schottky Diode V 50 mV/div Agilent 8470B Figure 1. Diode V/I characteristics Agilent 8472B Agilent offers a complete family of high performance Low Barrier Schottky Diode Detectors which cover the 10 MHz to 26.5 GHz frequency range. These general purpose components are widely used for CW and pulsed power detection, leveling of sweepers, and frequencyresponse testing of other microwave components. These detectors do not require a dc bias and can be used with common oscilloscopes, thus their simplicity of operation and excellent broadband performance make them useful measurement accessories. These detectors use a Low-Barrier Schottky Diode (LBSD), specially fabricated with low origin resistance and low junction capacitance. This results in improved broadband flatness and SWR over point-contact diode detectors, thus yielding more accurate measurements. These detectors also offer very good ruggedness and burnout protection. As with all Agilent detectors, these models integrate the diode with the other circuit elements thus minimizing stray reactances and optimizing broadband performance. For economical field repair, replaceable detector modules are available. Agilent 8473B Agilent 8473C Field-replaceable detector elements +1.00 +0.75 Frequency response (dB) +0.50 +0.25 0 -0.25 -0.50 -0.75 -1.00 0.01 Typical LBSD detector LBSD specifications In the event of diode burnout, field-replaceable detector elements are available for economical customer repair. The critical components are supplied (and tested) as an integrated unit, with the mount playing only a minor role in determining frequency response and SWR. The following table lists field-replaceable detector modules that have been tested to their respective specifications. Table 1. Agilent Model 423B 8470B 2 4 6 8 10 12 14 16 18 Agilent replacement part number 00423-60003 08470-60012 08470-60012 08473-80001 08473-80002 08473-80003 08473-80004 08473-80005 08473-80006 8472B 8473B Option 8473B-001 Option 8473B-003 8473C Option 8473C-001 Option 8473C-003 Frequency (GHz) Figure 2. Detector frequency response specifications 1.8 1.7 Frequency response (dB) 1.6 1.5 1.4 1.3 1.2 1.1 1.0 0.01 Typical LBSD detector 423B L LBSD specifications 8470B L RF connector 2 4 6 8 10 12 14 16 18 Frequency (GHz) D D 8472B 8473B/C L D Figure 3. Detector SWR specifications Figure 5. Drawing dimensions given in specification table 1.0 500.0 0.8 Maximum mismatch error (dB) Output voltage (mV) Typical SWR for LBSD detector models 2.0 Source SWR 1.5 Source SWR 50.0 LBSD 5.0 LBSD 0.6 0.4 0.5 Without load Square law loaded 0.2 0.05 0 1.0 1.2 1.4 Detector SWR 1.6 1.8 2.0 0.005 -50 -40 -30 -20 -10 0 Input power (dBm) Figure 4. Measurement uncertainty due to detector source mismatch 2 Figure 6. Typical detector square-law response Specifications Specifications1 Frequency range 2 Agilent 423B 0.01 to 12.4 GHz Agilent 8473B 0.01 to 18 GHz Agilent 8473C Agilent 8470B 0.01 to 18 GHz Agilent 8472B 0.00 to 18 GHz 0.01 to 26.5 GHz 0.2 dB 0.01 to 12.4 GHz: 0.3 dB 0.01 to 20 GHz: 6 dB 20 to 26.5 GHz: 1.5 dB from a 3.3 dB linear slope 0.01 to 4 GHz: 1.2 4 to 18 GHz: 1.5 18 to 26.5 GHz: 2.2 200 mW 1 watt (typical) 0.01 to 18 GHz: > 0.5 mV/W 18 to 26.5 GHz: > 0.1 8 mV/W < 50 V Frequency response Octave band flatness (over any octave 0 01 to 8 GHz) Broadband flatness 0.2 dB 0.2 dB 0.2 dB 0.2 dB 0.01 dB to 12.4 GHz: 0.3 dB 0.01 to 12.4 GHz: 0.3 dB 0.01 to 18 GHZ: 0.6 dB 0.01 to 12.4 GHz: 0.3 dB 0.01 to 15 GHz: 0.5 dB 0.01 to 18 GHz: 0.6 dB 0.01 to 4 GHz: 1.15 4 to 15 GHz: 1.30 15 to 18 GHz: 1.70 200 mW 1 watt (typical) > 0.5 mV/W 0.01 to 12.4 GHz: 0.3 dB 0.01 to 15 GHz: 0.5 dB SWR3, maximum (50 characteristic impedance) Maximum operating input (Peak or average) Short- term maximum Input (less than 1 min.) Sensitivity4 Noise (V peak-to-peak with CW power applied to produce 100 mV output) Environmental qualifications Operating temperature Vibration Shock Output polarity Input connector Output connector Video impedance RF bypass capacitor Dimensions in mm (inches) Length Diameter Weight in grams (oz) Net Shipping Options xxxx-001 Matched response Provides a pair of detectors with matched frequency response xxxx-002 Optimum square-law load xxxx-003 Positive polarity out 0.01 to 4 GHz: 1.15 4 to 12.4 G Hz: 1.30 200 mW 1 watt (typical) > 0.5 mV/W 0.01 to 4 GHz: 1.2 4 to 18 GHz: 1.5 200 mW 1 watt (typical) > 0.5 mV/W 0.01 to 4.5 GHz: 1.20 4.5 to 7 GHz: 1.35 200 mW 1 watt (typical) > 0.5 mV/W < 50 V < 50 V < 50 V < 50 V 0 to 55 C 20 G's, 80 - 2000 Hz 100 G's, 11 ms Negative Type N Male BNC Female 1 k to 2 k 1.3 k (typical) 20 pF to 60 pF 30 pF (typical) 63 (2.47) 20 (038) 114 (4) 454 (16) -20 C to +85 C 20 G's, 80 - 2000 Hz 100 G's, 11 ms Negative 3.5 mm Male (SMA Compatible) BNC Female 1 k to 2 k 1.3 k (typical) 20 pF to 60 pF 30 pF (typical) 48 (1.89) 10 (0.39) 14 (0.5) 454 (16) -20 C to +85 C 20 G's, 80 - 2000 Hz 100 G's, 11 ms Negative 3.5 mm Male (SMA Compatible) BNC Female 1 k to 2 k 1.3 k (typical) 20 pF to 60 pF 30 pF (typical) 43 (1.89) 10 (0.39) 14 (0.5) 454 (16) -20 C to +85 C 20 G's, 80 - 2000 Hz 100 G's, 11 ms Negative APC-7 BNC Female 1 k to 2 k 1.3 k (typical) 20 pF to 60 pF 30 pF (typical) 64 (2.50) 19 (0.75) 114 (4) 454 (16) -20 C to +85 C 20 G's, 80 - 2000 Hz 100 G's, 11 ms Negative SMA Male BNC Female 1 k to 2 k 1.3 k (typical) 20 pF to 60 pF 30 pF (typical) 64 (2.50) 14 (0.56) 57 (2) 454 (16) Tracking: 0.01 to 12.4 GHz: 0.2 dB Tracking: 0.01 to 12.4 GHz: 0.2 dB 12.4 to 18 GHz: 0.3 dB Optimum square -law load Positive polarity Output Tracking: 0.01 to 12.4 GHz: 0.2 dB 12.4 to 18 GHz: 0.3 dB 18 to 26.5 GHz: 0.5 dB Optimum square -law load Positive polarity Output Tracking: 0.01 to 12.4 GHz: 0.2 dB 12.4to 18 GHz: 0.3 dB Optimum square -law load Positive polarity Output Tracking: 0.01 to 12.4 GHz: 0.2 dB 12.4to 18 GHz: 0.3 dB Optimum square -law load Positive polarity Output Optimum square -law load Positive polarity Output 1. Specifications given for +25 C unless otherwise noted. Specifications describe the instrument's warranted performance. Supplemental characteristics (in italics) are intended to provide information useful in applying the instrument by giving typical, but not warranted, performance parameters. 2. RF may leak through video connector especially below 1 GHz; if objectionable, this may be eliminated with low-pass filter. 3. SWR measured at 2 dBm. 4. Sensitivity decreases with increasing temperature typically 0.5 dB from 20 C to +25 C, 0.5 dB from +25 C to +40v C. 1 dB from +40 C to +55 C, 1.25 dB from +55 C to +75 C, 1 dB from +75 C to +85 C. 3 Applications These detectors can be used in a wide variety of applications ranging from lab and production measurements to systems components. Because of their flatness and match, these detectors can be used for accurately measuring transmission and reflection characteristics in CW or swept-frequency measurements. For these applications in which both flat-frequency response and square-law characteristics are important, Option 423B, 847xB/C-001 provides a matched pair of detectors that track each other within a few tenths of a dB, and Option 423B, 847xB/C-002 (external square-law load) extends the square-law region up to at least 0.1 mW (10 dBm). Other common applications include use with a coupler or power splitter to externally level a source, and to display pulsed-RF and AM-modulated signals. For OEM and systems applications, the broadband flatness and ruggedness of these detectors make them particularly well suited for use in closed-loop leveling circuits in microwave instrumentation. www.agilent.com For more information on Agilent Technologies' products, applications or services, please contact your local Agilent office. The complete list is available at: www.agilent.com/find/contactus Americas Canada Latin America United States Asia Pacific Australia China Hong Kong India Japan Korea Malaysia Singapore Taiwan Thailand (877) 894-4414 305 269 7500 (800) 829-4444 1 800 629 485 800 810 0189 800 938 693 1 800 112 929 0120 (421) 345 080 769 0800 1 800 888 848 1 800 375 8100 0800 047 866 1 800 226 008 Square-law response For many reflection and transmission measurements it is desirable to use the detector in its square-law region where its output voltage is proportional to the input RF power. As shown in figure 5, the LBSD typically operate within 0.5 dB of square-law from the tangential signal sensitivity (TSS) level up to 18 dBm. By specifying Option 423B, 847xB/C-002, a specially selected loading resistor is provided which extends this square-law region to approximately 8 dBm with an associated decrease in sensitivity as shown in figure 5. Pulse response The LBSD detectors have extremely good pulse detection characteristics when working into low-capacitance, low-resistance loads. When loaded externally with 50 the LBSD detector can typically display 8 to 12 ns rise times. Figure 6 illustrates the equivalent circuit for the detector, as well as typical values for the diode impedance and the RF bypass capacitor. Europe & Middle East Austria 01 36027 71571 Belgium 32 (0) 2 404 93 40 Denmark 45 70 13 15 15 Finland 358 (0) 10 855 2100 France 0825 010 700* *0.125 /minute Diode impedance RF in 50 V RF bypass capacitor Video out Germany 07031 464 6333 Ireland 1890 924 204 Israel 972-3-9288-504/544 Italy 39 02 92 60 8484 Netherlands 31 (0) 20 547 2111 Spain 34 (91) 631 3300 Sweden 0200-88 22 55 Switzerland 0800 80 53 53 United Kingdom 44 (0) 118 9276201 Other European Countries: www.agilent.com/find/contactus Revised: October 6, 2008 Figure 7. Detector equivalent circuit Ordering Information To add options to a product, use the following ordering scheme: Model: 847xB/C (x= 0, 2 or 3) Example options: 8472B-001, 8473C-001 423B-001 847xB/C-001 423B-002 847xB/C-002 Matched pair of detectors External square-law load www.agilent.com/find/emailupdates Get the latest information on the products and applications you select. Product specifications and descriptions in this document subject to change without notice. (c) Agilent Technologies, Inc. 2009 Printed in USA, May 25, 2009 5952-8299 |
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