Title :
Optimized Transistor Output Power—Extending Cripps´ Loadline Method to Cascode Stages
Author :
Hauptmann, Stefan ; Ellinger, Frank
Author_Institution :
Dept. of Circuit Design & Network Theor., Dresden Univ. of Technol., Dresden, Germany
Abstract :
A method for analytical optimization of maximum distortionless output power in a class-A amplifier stage is presented. This method is based on Brown´s ideas to optimize the load resistance of triode vacuum tubes and Cripps´ loadline method. As a result, the maximum distortionless output power of a cascode stage can be directly calculated as a function of load impedance. The theoretical approach is demonstrated with the design of a 61.5-GHz low-noise amplifier involving a cascode stage as output stage.
Keywords :
low noise amplifiers; millimetre wave amplifiers; triodes; Cripps´ loadline method; analytical optimization; cascode stages; class-A amplifier stage; frequency 61.5 GHz; load impedance; load resistance; low-noise amplifier; maximum distortionless output power; transistor output power; triode vacuum tubes; Impedance; Impedance matching; Integrated circuit modeling; Load modeling; Power generation; Transistors; Transmission line measurements; Cascode stage; class-A amplifiers; loadline method; power amplifiers;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2011.2153871
