HP 5952-0496 free download

File name 5952-0496.pdf

Errata Document Title: Impedance Matching Techniques for Mixers and Detectors (AN 963) Part Number: 5952-0496 Revision Date: August 1980 HP References in this Application Note This application note may contain references to HP or Hewlett-Packard. Please note that Hewlett-Packard's former test and measurement, semiconductor products and chemical analysis businesses are now part of Agilent Technologies. We have made no changes to this application note copy. The HP XXXX referred to in this document is now the Agilent XXXX. For example, model number HP8648A is now model number Agilent 8648A. About this Application Note We've added this application note to the Agilent website in an effort to help you support your product. This manual provides the best information we could find. It may be incomplete or contain dated information, and the scan quality may not be ideal. If we find a better copy in the future, we will add it to the Agilent website. Support for Your Product Agilent no longer sells or supports this product. You will find any other available product information on the Agilent website: www.agilent.com Search for the model number of this product, and the resulting product page will guide you to any available information. Our service centers may be able to perform calibration if no repair parts are needed, but no other support from Agilent is available. Impedance Matching Techniques for Mixers and Detectors Application Note 963 Introduction The use of tables for designing impedance matching filters for real loads is well known [1]. Simple complex loads can often be matched by this technique by incorporating the imaginary portion of the load into the first filter element [2]. This technique is rarely useful for matching diodes because the equivalent circuit for the diode must include several real and imaginary elements. A methodical technique for matching such complex loads to a transmission line will be described. Previous references[3] to similar procedures were empirical in nature. No tables are used, but it is necessary to know the admittance of the diode in the frequency band of interest. Mixer Diode Admittance As an example, the Hewlett-Packard 5082-2709 mixer diode will be matched from 8 GHz to 12 GHz. A common local oscillator power level is one milliwatt, but it is not useful to measure the diode admittance at this level. The admittance is a function of power absorbed, so the diode admittance would change when the matching circuit is added. A GHz matching circuit designed for the diode admittance measured with one 12 milliwatt incident would be incorrect for a diode absorbing one 8 milliwatt. The correct measurement of diode admittance must use 4