But oscillators are also constructed without using negative resistance devices.Then how do they work .I mean how the energy then is not dissipated when the circuit is having positive dynamic resistance.
And also if oscillators could be constructed using positive dynamic resistance devices why use negative resistance devices?
But in oscillator we do not give any input energy then what is the origin of the output energy of that oscillator?
Obviously not sir.
But that is what we do in an oscillator.
The output is obtained by connecting the feedback from output to input that's what the most books say although I am not clear that how is this possible.
Please clarify this concept.
Stimulated process in the Laser is the best way to develop the concept.
Nice question Avinash... and right answers Haris... But this concrete question deserves a more concrete answer... and I will try to do it here...
The problem is one - to compensate the internal losses in a passive oscillating circuit by connecting active elements and power supply (i.e., an amplifier)... but the implementations (configurations) are two depending on the nature of these elements. First, we can do it by applying a positive feedback using 3-terminal active elements (connected in a 2-port non-inverting amplifier). Second, we can do it by adding the same (as the "positive" losses) but negative resistance using 2-terminal active elements with differential negative resistance (an odd 1-port amplifier). The result will be the same - the losses will "disappear" and the passive circuit will oscillate eternally:)
So, you are not necessarily obliged to use elements with negative resistance to realize a oscillator... but it seems that in most cases this is a more convenient way to compensate losses. See more about the topic in the questions below:
https://www.researchgate.net/post/What_is_negative_differential_resistance_How_is_it_implemented_How_does_it_operate_What_is_its_relationship_with_the_true_negative_resistance
https://www.researchgate.net/post/What_is_negative_impedance_Does_it_exist_If_so_how_can_elements_with_negative_impedance_be_implemented_Are_they_passive_or_active
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