قارن الطرق

	السحب والترك	مخطط سميث
المجال	الهندسة الكهربائية	الهندسة الكهربائية
العائلة	Process / pipeline	Process / pipeline
سنة النشأة	1990	1939
صاحب الطريقة	Andrew Davidson	Phillip H. Smith
النوع	Experimental characterization of power amplifier performance under varying load/source conditions	Graphical tool for transmission line and impedance analysis
المصدر التأسيسي	Cripps, S. C. (1999). RF Power Amplifiers for Wireless Communications. Artech House.	Smith, P. H. (1939). Transmission line calculator. Electronics, 12(1), 29-31.
الأسماء البديلة	Load-pull measurement, Source-pull optimization	Impedance chart, Reflection coefficient chart
ذات صلة	3	3
الملخص	Load-Pull is an experimental technique for characterizing and optimizing RF power amplifier performance under varying load and source impedance conditions. Introduced by Davidson et al. in 1990, load-pull measurements vary the load impedance seen by the amplifier while recording output power, efficiency, and linearity. Load-pull reveals contours of constant gain, efficiency, and stability, enabling optimal impedance matching for maximum performance. Essential for power amplifier design and characterization.	The Smith Chart is a graphical tool for visualizing and manipulating complex impedances and reflection coefficients on transmission lines. Introduced by Phillip Smith in 1939, the chart maps the complex reflection coefficient plane to a circular chart, enabling intuitive graphical analysis of transmission line problems, impedance matching, and resonance conditions. Despite the advent of computers, the Smith Chart remains invaluable for understanding transmission line physics and designing RF circuits.