Diode Detector Circuit Using the 1SS351 Application Note Overview This application note explains about ON Semiconductor’s 1SS351 which is used as a diode detector circuit. www.onsemi.com A Schottky diode is a diode using the schottky barrier generating due to the junction of the metal and the semiconductor. Because of its low forward voltage and fast switching operation, it is suitable for high-frequency use. In wireless applications like radio, in order to adjust the received power level and to transmit the target power to the amplifier, it is necessary to detect the received power and to feed back the detection voltage through an AGC circuit. A Schottky diode is used in detection circuit in this case. The principle of diode detection is rectifying the signal (AC component) through a diode and generating voltage as DC component. The detection makes use of the non-linear characteristic of the Schottky diode, so a bias circuit is not necessary. © Semiconductor Components Industries, LLC, 2014 November 2014- Rev. 0 1 Publication Order Number: AND1SS351_1/D Diode Detector Circuit Using the 1SS351 ■Circuit Design INPUT OUTPUT C1 D1 R1 R2 ■Evaluation Board www.onsemi.com 2 C2 Diode Detector Circuit Using the 1SS351 ■Bill of Materials Item Symbol Value Manufacture Size SBD D1 1SS351 ON Semiconductor SC-59 C1 1000 pF Various 1005 C2 1000 pF Various 1608 R1 100 Ω Various 1608 R2 470k Ω Various 1608 Capacitor Resistor Material FR-4 www.onsemi.com 3 25 x 10 mm Diode Detector Circuit Using the 1SS351 ■Spice Model Model : Diode Parameter Value Unit Parameter Value Unit IS 500n A TT 5n S N 1 XTI 2.0 BV 5.0 V EG 0.69 eV IBV 200u A Cp1 90f F RS 1.7 Ω Cp2 90f F FC 0.5 Ll1 0.8n H CJO 700f F Ll2 0.8n H VJ 240m V Ll3 0.5n H M 157m Lw1 0.8n H Lw2 0.8n H ■Equivalent Circuit Model Cp2 Cp1 Ll1 Lw1 Lw2 1 Ll2 2 3 Ll3 3 1 2 www.onsemi.com 4 Diode Detector Circuit Using the 1SS351 ■Measurement Results 10 Output Voltage ‐ V 1 0.1 0.01 0.001 0.0001 ‐40 ‐30 ‐20 ‐10 0 Input Power ‐ dBm 10 20 Figure 1 Output Voltage vs. Input Power www.onsemi.com 5 Diode Detector Circuit Using the 1SS351 ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC) or its subsidiaries in the United States and/or other countries. SCILLC owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of SCILLC’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf . SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. www.onsemi.com 6