Bernhard Jakoby,
"Achieving signal power amplification using energetically passive devices"
, in E und I - Elektrotechnik und Informationstechnik, 2022, ISSN: 0932-383X
Original Titel:
Achieving signal power amplification using energetically passive devices
Sprache des Titels:
Deutsch
Original Kurzfassung:
This article discusses some fundamental
properties of electronic amplifiers and the associated
implications. When defining the passivity of a multiport
circuit in the sense of net power consumption
(rather than the ability to amplify signals), devices
such as transistors, which are commonly described as
?active?, have to be considered passive, which is referred
to as ?energetically passive? to avoid confusion
with other definitions. It is shown that, when using
such energetically passive devices to achieve signal
power amplification, the amplifier circuit necessarily
has to feature a non-linear transfer function. The
article discusses how two common concepts (class A
and B amplifiers) to achieve signal power amplification
with such devices can be fundamentally related
to Poynting?s theorem and that both of these concepts
allow the realization of at least piecewise linear transfer
functions in spite of the necessary non-linearity.