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chaos in negative resistance

Discussion in 'Electronics Homework Help' started by bhuvanesh, Feb 4, 2014.

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  1. bhuvanesh

    bhuvanesh

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    Aug 29, 2013
    we know voltage divider bias circuit gives the fraction of the input voltage.i seen in a book that with choosing any one of the resistance has negative ,we achieve amplification.what does that negative resistance mean.how does it affect the circuit.explain me basically
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    Negative resistance is a characteristic of a circuit whereby the current required (or demanded) goes up as the voltage goes down.

    A common example is a PC power supply. If your mains voltage dips, the current drawn from the mains increases to maintain the same power to the load. In general this is a characteristic of a switch mode power supply.

    You cannot actually buy a negative resistance resistor though :) Circuits which exhibit this behaviour are generally more complex than a simple 2 terminal device.

    Having said that, some semiconductors exhibit negative resistance characteristics over a small range of voltages and/or currents. The classical example is the tunnel diode.

    A tunnel diode is a two terminal device that can amplify.

    There's plenty of information if you Google for "negative resistance".
     
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