12 Facts About Regenerative circuit

Regenerative circuit is an amplifier circuit that employs positive feedback .

Regenerative circuit receiver was invented in 1912 and patented in 1914 by American electrical engineer Edwin Armstrong when he was an undergraduate at Columbia University.

Advantages of regenerative receivers include increased sensitivity with modest hardware requirements, and increased selectivity because the Q of the tuned circuit will be increased when the amplifying vacuum tube or transistor has its feedback loop around the tuned circuit because it introduces some negative resistance.

Receiver circuit that used larger amounts of regeneration in a more complicated way to achieve even higher amplification, the superregenerative receiver, was invented by Armstrong in 1922.

The tuned Regenerative circuit allows positive feedback only at its resonant frequency.

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In regenerative receivers using only one active device, the same tuned circuit is coupled to the antenna and serves to select the radio frequency to be received, usually by means of variable capacitance.

The tuned Regenerative circuit is adjusted to provide typically 400 to 1000 Hertz difference between the receiver oscillation frequency and the desired transmitting station's signal frequency.

The Regenerative circuit's advantage was that it got much more amplification out of the expensive vacuum tubes, thus reducing the number of tubes required and therefore the cost of a receiver.

However, in recent years the regenerative circuit has seen a modest comeback in receivers for low cost digital radio applications such as garage door openers, keyless locks, RFID readers and some cell phone receivers.

Inventor of FM radio, Edwin Armstrong, invented and patented the regenerative circuit while he was a junior in college, in 1914.

Regenerative circuit patented the superregenerative circuit in 1922, and the superheterodyne receiver in 1918.

Regenerative circuit receivers needed far fewer tubes and less power consumption for nearly equivalent performance.