LNA 2.4GHz using passive components
currently i`m doing my final year degree project which is LNA 2.4GHz but the requirement is i need the circuit that only using passive components.can anyone help me how can i achieved my target towards this project.thanks...
Hiu,
How is it to undertsand pls, an 2.4GHz amplifer with passive componenets?
K.
You could look at using "parametric amplifiers" that use varactor diodes. Varactor diodes are usually thought of as being passive components. If you pump the diode at one frequency, the diode can form a negative resistance at 2.4 GHz, which you can they use for a reflection amplifier.
Another thing you could do is have a big array of antennas, and power combine each antenna coherently to get apparent "gain". That is passive too. Variations would be some array of reflector plates driving a passive collector antenna.
Added after 2 minutes:
There are also ferromagnetic amplifiers that are "passive", but not sure if you could get the effect to work as high as 2.4 GHz.
I also suppose you could take sunlight, pass it thru a magnifying lens to concentrate it, electro optically modulate the sunlight's amplitude with the 2.4 GHz microwave signal, and then use an efficient photodetctor diode (or array of diodes) to convert back to microwaves. All parts are passive, and if you did the link budget carefully, you might eek out 10 dB of gain or so.
OK Brian,
I know parametric Amps(over 40 years), but a dioe, or all semiconductors are , for me, active devices...
Maybe the lexicon has it others-I dont know.
Ferromagnetic effect is new for me_I belive it, but thes subject with sun light & so on...
Good, can be a possibility_ dont forget erbium effects?
K.
I thought of an erbium doped fiber amp, but it is hard to think of that as a passive component. I guess it depends on your point of view.
ahhhh but the trick and definition of passive is that there is NO external power
supply source :)
so, as in biff44's parametric amp, my varactor (diode) tripler from 432 to 1296
MHz is a passive multiplier, there is no external DC source feeding the circuit
cheers
Dave
VK2TDN
the requirement for this project is all the components for this LNA are passive components.this application will be use for WI-FI purpose.can i know the bandwidth for WI-FI?
What exactly do you mean by "passive". Do any of the the examples given qualify?
A "passive" amplifier will not have gain.
Maybe this is a misunderstand and the task is to do a "small signal" design, based on the linear (small signal) data of the transistor?
If the circuit will be passive, how it will be "low noise" ?
Total attenuation will be equivalent to NF.
I believe the original poster wants to design an LNA using discrete components (L's and C's), instead of using microstrip stubs and transmission lines.
I believe this is a passive lna:
I guess you are kidding biff44,