Regenerative circuit

A regenerative circuit is an <a href="/facts/Amplifier/pnRgxncC">amplifier</a> circuit that employs <a href="/facts/Positive_feedback/eFGatCpF">positive feedback</a> (also known as regeneration or reaction). Some of the output of the amplifying device is applied back to its input to add to the input signal, increasing the amplification. One example is the <a href="/facts/Schmitt_trigger/TzjbP3dD">Schmitt trigger</a> (which is also known as a regenerative comparator), but the most common use of the term is in <a href="/facts/Radio_Frequency/aWku7h4R">RF</a> amplifiers, and especially regenerative receivers, to greatly increase the <a href="/facts/Gain_(electronics)/CWbehg27">gain</a> of a single amplifier stage.
The regenerative receiver was invented in 1912 and patented in 1914 by American electrical engineer <a href="/facts/Edwin_Armstrong/EI9gYvzm">Edwin Armstrong</a> when he was an undergraduate at <a href="/facts/Columbia_University/Hlf1gw53">Columbia University</a>. It was widely used between 1915 and <a href="/facts/World_War_II/2efV5L1U">World War II</a>. Advantages of regenerative receivers include increased sensitivity with modest hardware requirements, and increased selectivity because the <a href="/facts/Q_factor/NNjGLb5b">Q</a> of the tuned circuit will be increased when the amplifying vacuum tube or transistor has its <a href="/facts/Feedback_loop/XnuWH3zp">feedback loop</a> around the tuned circuit (via a "tickler" winding or a tapping on the coil) because it introduces some <a href="/facts/Negative_resistance/QgkR8esF">negative resistance</a>.
Due partly to its tendency to radiate interference when oscillating,: p.190  by the 1930s the regenerative receiver was largely superseded by other <a href="/facts/Tuned_radio_frequency_receiver/UTFAQHzx">TRF</a> receiver designs (for example <a href="/facts/Reflex_receiver/Yja9zKkD">"reflex" receivers</a>) and especially by another Armstrong invention - <a href="/facts/Superheterodyne_receiver/S2SA0NCV">superheterodyne receivers</a> and is largely considered obsolete.: p.190  Regeneration (now called positive feedback) is still widely used in other areas of electronics, such as in <a href="/facts/Electronic_oscillator/6NaXsSzJ">oscillators</a>, <a href="/facts/Active_filter/NsyjIJ4L">active filters</a>, and <a href="/facts/Bootstrapping_(electronics)/Hq6HaKxR">bootstrapped amplifiers</a>.
A receiver circuit that used larger amounts of regeneration in a more complicated way to achieve even higher amplification, the superregenerative receiver, was also invented by Armstrong in 1922.: p.190  It was never widely used in general commercial receivers, but due to its small parts count it was used in specialized applications. One widespread use during WWII was <a href="/facts/Identification_friend_or_foe/ANQjz9NM">IFF</a> <a href="/facts/Transceiver/S6HSzRPf">transceivers</a>, where single tuned circuit completed the entire electronics system. It is still used in a few specialized low data rate applications, such as <a href="/facts/Garage_door_opener/WAkRXX0M">garage door openers</a>, <a href="/facts/Wireless_networking/yr4SWTdl">wireless networking</a> devices, <a href="/facts/Walkie-talkie/SdnWoAad">walkie-talkies</a> and toys.

Regenerative circuit open-in-new

Regenerative circuit