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The Measurement of Noise Figure
NOISE OF SPECTRAL DISCONTINUITY
Tube and Transistor Noise
6 other sections not shown
a2Rs achieved amplifier under test antenna noise temperature approximately audio calculate capacitance capacitor carrier coil common base common cathode common emitter common grid curves db bandwidth decrease desired signal diode distortion double-tuned effect Electronic emitter current equivalent noise resistance feedback frequency range front end function high frequencies i-f frequency inductance input circuit input impedance input noise input resistance intermodulation loss low-noise lowest noise figure matched conditions measured method mixer neutralization noise bandwidth noise circuit noise contribution noise factor Noise figure versus noise modulation noise power noise sources noise voltage nonlinear obtained operating oscillator over-all overload plotted possible post amplifier power gain practical circuits produce pulse r-f stage receiver resistor selectivity shot noise shown in Fig signal level signal-to-noise ratio source resistance spurious responses Telefunken thermal noise transconductance tuned circuit typical vacuum tubes wideband amplifier