Agilent 423B, 8470B, 8472B, 8473B/C Low Barrier Schottky Diode Detectors Data Sheet * Excellent broadband flatness * Low broadband SWR * High burnout protection * Environmentally rugged * Field replaceable diode elements Agilent 423B Agilent 8470B Agilent 8472B Agilent 8473B Agilent 8473C Figure 1. Diode V/I characteristics. 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. Field-replaceable detector elements 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. Agilent model 2 Agilent replacement part number 423B 00423-60003 8470B 08470-60012 8472B 08470-60012 Figure 2. Detector frequency response specifications. 8473B 8473B Opt 001 8473B Opt 003 8473C 8473C Opt 001 8473C Opt 003 08473-80001 08473-80002 08473-80003 08473-80004 08473-80005 08473-80006 Figure 3. Detector SWR specifications. Figure 5. Drawing dimensions given in specification table. Figure 4. Measurement uncertainty due to detector source mismatch. Figure 6. Typical detector square-law response. Specifications Specifications1 Agilent 423B Agilent 8473B Agilent 8473C Agilent 8470B Agilent 8472B Frequency range2 0.01 to 12.4 GHz 0.01 to 18 GHz 0.01 to 26.5 GHz 0.01 to 18 GHz 0.00 to 18 GHz 0.2 dB 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 12.4 GHz: 0.3 dB 0.01 to 18 GHZ: 0.6 dB 0.01 to 20 GHz: 6 dB 20 to 26.5 GHz: 1.5 dB 0.01 to 18 GHz: 0.6 dB from a 3.3 dB linear slope 0.01 to 12.4 GHz: 0.3 dB 0.01 to 12.4 GHz: 0.3 dB 0.01 to 15 GHz: 0.5 dB 0.01 to 15 GHz: 0.5 dB 0.01 to 18 GHz: 0.6 dB SWR3, maximum (50 0.01 to 4 GHz: 1.15 characteristic impedance) 4 to 12.4 G Hz: 1.30 0.01 to 4 GHz: 1.2 4 to 18 GHz: 1.5 18 to 26.5 GHz: 2.2 0.01 to 4 GHz: 1.2 4 to 18 GHz: 1.5 15 to 18 GHz: 1.4 0.01 to 4 GHz: 1.15 4 to 15 GHz: 1.30 7 to 12.4 GHz: 1.50 12.4 to 18 GHz: 1.70 0.01 to 4.5 GHz: 1.20 4.5 to 7 GHz: 1.35 Maximum operating input (Peak or average) 200 mW 200 mW 200 mW 200 mW 200 mW Short- term maximum Input (less than 1 min.) 1 watt (typical) 1 watt (typical) 1 watt (typical) 1 watt (typical) 1 watt (typical) Sensitivity4 >0.5 mV/W >0.5 mV/W 0.01 to 18 GHz: >0.5 mV/W >0.5 mVW 18 to 26.5 GHz: >0.1 8 mV/W >0.5 mV/W <50 V <50 V <50 V <50 V 20 C to +85 C 20 G's, 80 - 2000 Hz 100 G's, 11 ms 20 C to +85 C 20 G's, 80 - 2000 Hz 100 G's, 11 ms 20 C to +85 C 20 G's, 80 - 2000 Hz 100 G's, 11 ms 20 C to +85 C 20 G's, 80 - 2000 Hz 100 G's, 11 ms Frequency response Octave band flatness (over any octave 0 01 to 8 GHz) Broadband flatness Noise (V peak-to-peak <50 V with CW power applied to produce 100 mV output) Environmental qualifications Operating temperature 0 to 55 C Vibration 20 G's, 80 - 2000 Hz Shock 100 G's, 11 ms Output polarity Negative Negative Negative Negative Negative Input connector Type N Male (SMA Compatible) 3.5 mm Male (SMA Compatible) 3.5 mm Male Type N Male/Option 012 APC-7 SMA Male Output connector BNC Female BNC Female BNC Female BNC Female BNC Female Video impedance 1 k to 2 k 1.3 k (typical) 1 k to 2 k 1.3 k (typical) 1 k to 2 k 1.3 k (typical) 1 k to 2 k 1.3 k (typical) 1 k to 2 k 1.3 k (typical) RF bypass capacitor 20 pF to 60 pF 30pF (typical) 20 pF to 60 pF 30 pF (typical) 20 pF to 60 pF 30 pF (typical) 20 pF to 60 pF 30 pF (typical) 20 pF to 60 pF 30 pF (typical) Dimensions in mm (inches) Length Diameter 63 (2.47) 20 (038) 48 (1.89) 10 (0.39) 43 (1.89) 10 (0.39) 64 (2.50) 19 (0.75) 64 (2.50) 14 (0.56) Weight in grams (oz) Net Shipping 114 (4) 454 (16) 14 (0.5) 454 (16) 14 (0.5) 454 (16) 114 (4) 454 (16) 57 (2) 454 (16) Tracking: 0.01 to 12.4 GHz: 0.2 dB Tracking: Tracking: 0.01 to 12.4 GHz: 0.2 dB 0.01 to 12.4 GHz: 0.2 dB 12.4 to 18 GHz: 0.3 dB 12.4 to 18 GHz: 0.3 dB 18 to 26.5 GHz: 0.5 dB Tracking: Tracking: 0.01 to 12.4 GHz: 0.2 dB 0.01 to 12.4 GHz: 0.2 dB 12.4to 18 GHz: 0.3 dB 12.4to 18 GHz: 0.3 dB Optimum square -Law load -- -- Optimum square -Law load Optimum square -Law load Positive polarity Output Positive polarity Output Positive polarity Output Positive polarity Output Positive polarity Output Option 001 Matched response Must order quantity two (2) standard units with quantity two (2) Opt 001's for a pair of detectors with matched frequency response Option 002 Optimum square-law load Option 003 Positive polarity out 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 001 provides a matched pair of detectors that track each other within a few tenths of a dB, and Option 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. 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 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. Agilent Technologies' Test and Measurement Support, Services, and Assistance Agilent Technologies aims to maximize the value you receive, while minimizing your risk and problems. We strive to ensure that you get the test and measurement capabilities you paid for and obtain the support you need. 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(c) Agilent Technologies, Inc. 1990, 2001 Printed in USA, August 7, 2001 5952-8299