scholarly journals A 2.4 GHz-Band 250 W, 60% Feedback-Type GaN-HFET Oscillator Using Imbalanced Coupling Resonator for Use in the Microwave Oven

2019 ◽  
Vol 9 (14) ◽  
pp. 2887 ◽  
Author(s):  
Hikaru Ikeda ◽  
Yasushi Itoh
Keyword(s):  
Circuit Design ◽  
High Efficiency ◽  
Coupling Factor ◽  
Microwave Oven ◽  
Feedback Type ◽  
Phase Adjustment ◽  
Effect Transistor ◽  
Gan Hfet ◽  
Transistor Oscillator ◽  
Design Techniques

Circuit design techniques for enhancing an efficiency of the high power feedback-type GaN-HFET (Gallium Nitride Heterojunction Field Effect Transistor) oscillator for use in the microwave oven are shown in this paper, focusing primarily on the harmonic terminations for high efficiency of power amplifiers, the coupling factor to feedback circuits and the insertion phase adjustment of feedback loops. With the use of these circuit design techniques, an output power of 263 W and an efficiency of 61.3% have been successfully achieved at 2.44 GHz.

A high accuracy linear rate meter

1975 ◽  
Vol 39 (2) ◽  
pp. 327-330
Author(s):  
C. R. Wyss
Keyword(s):  
Circuit Design ◽  
Digital Circuits ◽  
Analog Computer ◽  
High Accuracy ◽  
Digital Display ◽  
Instantaneous Rate ◽  
Linear Rate ◽  
Very High ◽  
Design Techniques

By implementing analog computer techniques using digital circuits, an instantaneous rate meter was built with approximately 100 times the accuracy of commercially available rate meters. The circuit is accurate to within +/- 0.2 events/min over a range of rates of 0.2–900 epm. Modifications can be made to provide a digital display of rate. The circuit design techniques used in developing the rate meter may be used to generate a wide variety of functions of time with very high accuracy.

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