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Introduction to Microwave Measurements, I
Introduction to Microwave Measurements, I

... based on transmission lines. Topics to be examined include detection of microwave power and the measurement of impedance, reflection coefficient, and voltage standing wave ratio (VSWR). The propagation velocity, loss, and characteristic impedance of various transmission lines will also be measured. ...
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File

...  Limited to materials where the resistance remains constant.  Ohmic  materials to which Ohm’s law applies. Ex: wires or lightbulb filaments.  Nonohmic  Ohm’s law does not apply. Ex: the internal workings of batteries and capacitors. Resistors  circuit elements designed to create resistance to ...
Fulltext: english,
Fulltext: english,

English Translation
English Translation

... 70 micron gold-plated circuits look after a channel each including the mounting for the tubes. An undervalued gem from German production, the EF 184 is used for the input and voltage amplifier. This is known as a very steep wide band pentode (a large amplifying tube). The signal is then passed direc ...
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SGA3463Z 数据资料DataSheet下载
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Biologically Inspired Sensor: Expansion of the Automatic Gain

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Regenerative circuit



The regenerative circuit (or regen) allows an electronic signal to be amplified many times by the same active device. It consists of an amplifying vacuum tube or transistor with its output connected to its input through a feedback loop, providing positive feedback. This circuit was widely used in radio receivers, called regenerative receivers, between 1915 and World War II. The regenerative receiver was invented in 1912 and patented in 1914 by American electrical engineer Edwin Armstrong when he was an undergraduate at Columbia University. Due partly to its tendency to radiate interference, by the 1930s the regenerative receiver was superseded by other receiver designs, the TRF and superheterodyne receivers and became obsolete, but regeneration (now called positive feedback) is widely used in other areas of electronics, such as in oscillators and active filters. A receiver circuit that used regeneration in a more complicated way to achieve even higher amplification, the superregenerative receiver, was invented by Armstrong in 1922. It was never widely used in general receivers, but due to its small parts count is used in a few specialized low data rate applications, such as garage door openers, wireless networking devices, walkie-talkies and toys.
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