Conversion loss limitations on Schottkybarrier mixers
Abstract
A set of criteria involving diode area, material parameters, and temperature is introduced for the Schottkybarrier mixer diode. The effect that a reduction in diode area can have on the intrinsic conversion loss of the diode resulting from its nonlinear resistance is analyzed, focusing on the competing requirements of impedancematching the diode to its imbedding circuit and the finite dynamic range of the nonlinear resistance. As a result, intrinsic conversion loss can increase rapidly as the area is reduced. Results are expressed in terms of dimensionless parameters, and some representative examples are investigated in detail. The following conclusions are drawn: a large Richardson constant extends the usefulness of the diode to smaller diameters, and hence, shorter wavelengths; cooling a thermionic emitting diode can have a very detrimental effect on intrinsic conversion loss; impedance mismatching is found, in general, to be a necessity for minimum conversion loss; and large barrier heights are desirable for efficient tunnel emitter converters.
 Publication:

IEEE Transactions on Microwave Theory Techniques
 Pub Date:
 January 1977
 DOI:
 10.1109/TMTT.1977.1129031
 Bibcode:
 1977ITMTT..25...54M
 Keywords:

 Energy Dissipation;
 Microwave Circuits;
 Mixing Circuits;
 Schottky Diodes;
 Signal Mixing;
 Temperature Effects;
 Electrical Resistance;
 Energy Conversion Efficiency;
 Impedance Matching;
 Mixers;
 Nonlinearity;
 Performance Prediction;
 Thermionic Emission;
 VoltAmpere Characteristics;
 Electronics and Electrical Engineering