Diffrentiate Between ACTIVE DEVICE and PASSIVE DEVICE...

[webscatter]

Sa pagkakaalam ko...

Active device is when there's a transfer of resistance between input and output from LOW to HIGH or vice versa...

Passive Device is when it does not possess a property of transresistance...



how do u diffrentiate these devices.....share your kaalaman po.....

[ivANALOG]

para sa akin, an active device has the capability to alter or manipulate electrical parameters (voltage, current), one example is amplification (dko po alam yung iba :p that's why meron din ako nababasa na "device which can amplify current/voltage). where as a passive device can't.

ang diode ba active or passive? meron kasi ako nababasa na active, meron din nagsasabi na passive.

[eveready battery]

para sa akin, an active device has the capability to alter or manipulate electrical parameters (voltage, current), one example is amplification (dko po alam yung iba :p that's why meron din ako nababasa na "device which can amplify current/voltage). where as a passive device can't.

ang diode ba active or passive? meron kasi ako nababasa na active, meron din nagsasabi na passive.

active device ang diode,basta nangangailangan ng bias para magoperate,active devices yan(property nya rectify,di pwedeng maging passive dahil semicon device),tatlo lang ang passive devices,Resistor,Inductor,Capacitor(RLC) pero may exception like piezoelectric phenomenon like crystals ang ceramic resonators kasi passive ito,correct me if i'm wrong 

properties ng active devices like amplify,rectify,conduct(switching) and negative resistance as oscillators.

http://en.wikipedia.org/wiki/Electronic_component

[rdpzycho]

A passive component, depending on field, may be either a component that consumes (but does not produce) energy, or a component that is incapable of power gain.

kaya ang diode can be considered passive. ang general guide, kapag gagamit ka ng other supply to add energy, active na siya like transistors.

active device ang diode,basta nangangailangan ng bias para magoperate,active devices yan(property nya rectify,di pwedeng maging passive dahil semicon device),tatlo lang ang passive devices,Resistor,Inductor,Capacitor(RLC) pero may exception like piezoelectric phenomenon like crystals ang ceramic resonators kasi passive ito,correct me if i'm wrong 

from Wikipedia about Passivity.

In circuit design, informally, passive components refer to ones that are not capable of power gain. Under this definition, passive components include capacitors, inductors, resistors, diodes, and transformers.

passive din 'yung mga crystals, and other resonators like SAW, FBAR, etc.

[eveready battery]

A passive component, depending on field, may be either a component that consumes (but does not produce) energy, or a component that is incapable of power gain.

kaya ang diode can be considered passive. ang general guide, kapag gagamit ka ng other supply to add energy, active na siya like transistors.

from Wikipedia about Passivity.

In circuit design, informally, passive components refer to ones that are not capable of power gain. Under this definition, passive components include capacitors, inductors, resistors, diodes, and transformers.

passive din 'yung mga crystals, and other resonators like SAW, FBAR, etc.

thanks for correcting sir rd,
iba naiisip ko nung nabasa ko ito:
Active components are those that have gain or directionality, in contrast to passive components, which have neither. They include semiconductor devices and vacuum tubes (valves).

nakita ko na sir yung conclusion ng active between passive,basta walang gain passive,ikinonsider nyang passive ang diode dahil wala itong gain. 

[rdpzycho]

kaya medyo magulo. sa ibang text kasi passive ang diode, sa iba naman active. kaya minsan nakakalito lang ipa-isip sa estudyante. hehehe.

'yung ibang filters na resonator type isa lang ang direction or hindi parehas ang response kapag binaligtad.

[eveready battery]

kaya medyo magulo. sa ibang text kasi passive ang diode, sa iba naman active. kaya minsan nakakalito lang ipa-isip sa estudyante. hehehe.

'yung ibang filters na resonator type isa lang ang direction or hindi parehas ang response kapag binaligtad.

iba kasi naiisip ko pag active,pag active nag ooperate sa active region(nasa bias point,which is may nangyaring di linear response,like diode di na linear current nya pag may bias na),pero sa definition ng passivity,wala syang gain,para kasi ang diode ang purpose nya is to change direction kapag may signal kang nag-ooperate,hehehe ang gulo talaga 

[webscatter]

One of the components n naging debate is Semicon Diode....either active ba or passive....?

Like for example kasi...

LOGIC:
Diode logic (RDL)

kung pag-aaralan mo ng maigi ang response ng diode....it would be active kasi....


RECTIFICATION:

d2 naman...kung di dhil sa diode di magkaroon ng alteration ng signal....AC turn into DC

kaya may relationship n ang Vdc=2Vm/pi  (esp...kung may filter capacitor na ito...)

at meron pang Rd=26mV/Id

kung pag-aralan mo rin ...nagiging active ang diode....


as u see ....lahat ng associated components nya ay passive....kung meron man

kaya there are variations of diode because of this active nature...

line PIN, AVALANCE, LED, PHOTOSENSITIVE, VARACTOR, etc...

what is your opinion?

[rdpzycho]

I still think that diodes can be considered passive. 'di niya kailangan ng extra energy dahil 'di niya rin kayang magdagdag ng energy sa input sa kanya. ilalagay mo lang 'yung diode sa dapat niyang kalagyan, then may result na, whereas, the common active devices, kailangang ayusin ang bias, lagyan ng supply, etc.

BTW, gumagamit din ako ng diode as RF mixers. mas magmumukha siyang active dahil nagkakaroon ng multiplication sa frequency domain (sa non-linear region ginagamit), but just as above, ilalagay lang 'yung diode sa path ng dalawang imi-mix, then ok na.

http://en.wikipedia.org/wiki/Passivity_(engineering)

[tony]

passive devices allow symetrical current flow in both directions.....in active devices dc current flow is unilateral...diodes are active devices...

[rdpzycho]

^ actually sir wala sa definition ng passive device ang symmetrical flow. kung sakali kasi ang electrolytic capacitor magiging active dahil hindi similar ang current flow sa tamang polarity at reverse polarity.

from allaboutcircuits.com:

Components incapable of controlling current by means of another electrical signal are called passive devices.

from Wikipedia:

In circuit design, informally, passive components refer to ones that are not capable of power gain. Under this definition, passive components include capacitors, inductors, resistors, diodes, and transformers

from sound.westhost.com:

Passive:   Capable of operating without an external power source. Typical passive components are resistors, capacitors, inductors and diodes (although the latter are a special case).

[webscatter]

I dont think n diode is passive....

transistor itself consist of 2 diodes na ginawang back to back....

IV characteristics ng diode makikita mo n active cya....

[rdpzycho]

mukha lang siyang back to back diode but in practice, kapag na back to back ang diode 'di siya magiging transistor. explained here in detail:

http://www.allaboutcircuits.com/vol_3/chpt_4/3.html

'yung IV characteristic niya is non-linear but it doesn't mean na active na kaagad siya.

even in microwave, mixers are considered passive kahit na puro diode siya.

from Microwaves101:

What is the exception to the "passive rule" about not adding energy? Mixers! Here the local oscillator adds energy, but because of the way that a mixer works, no signal gain is possible.

doon sa Wikipedia link meron ding formal definition ng passivity with given equation.

http://en.wikipedia.org/wiki/Passivity_(engineering)#Thermodynamic_passivity

For memoryless two-terminal elements, this means that the current–voltage characteristics lie in the first and third quadrant (i.e., voltage and current have the same sign).

from the above statement, sa diode voltage and current will still stay in the same quadrant, just exhibiting non-linear properties.

[rdpzycho]

BTW, nakita ko sa list ng application notes ko:

Understadning Basic Analog - Passive Devices from TI

http://focus.ti.com/lit/an/sloa027/sloa027.pdf

[eveready battery]

passive devices allow symetrical current flow in both directions.....in active devices dc current flow is unilateral...diodes are active devices...

Iyan din naiisip ko pero baka dual characteristics ang diode kagaya ng light in nature,wave at  particles characteristics ang nakikita nila.

[labgruppen]

kung gain or amplification ang isang criteria ng pagiging active, well some diodes are active.. ex. tunnel diode, gunn diode <-these diodes can provide provide amplification and is usually used as gain devices in microwave oscillators, and microwave rf amps, though more advanced semicon devices are now used for rf amps instead.

[tony]

Iyan din naiisip ko pero baka dual characteristics ang diode kagaya ng light in nature,wave at  particles characteristics ang nakikita nila.

what i mean is between the 2 terminals of a passive device current flow is bi-lateral, meaning can flow in either direction......even with the electrolytic caps current can flow in either direction, nga lang kung mali ang polarity meron bang factor...

[rdpzycho]

kung gain or amplification ang isang criteria ng pagiging active, well some diodes are active.. ex. tunnel diode, gunn diode <-these diodes can provide provide amplification and is usually used as gain devices in microwave oscillators, and microwave rf amps, though more advanced semicon devices are now used for rf amps instead.

the actual criteria sir is total power in is not equal to total power out + losses. kaya ang Thyristors (SCR, Triacs), considered na active dahil kailangan ng additional energy sa gate control pin kahit maliit lang.

then as listed sa application note ng TI, rectifier diode, not all diodes. 'yung tunnel diode at gunn diode kasi merong negative resistance region, IIRC, kaya 'di siya pasok doon sa criteria na: For memoryless two-terminal elements, this means that the current–voltage characteristics lie in the first and third quadrant (i.e., voltage and current have the same sign).

what i mean is between the 2 terminals of a passive device current flow is bi-lateral, meaning can flow in either direction......even with the electrolytic caps current can flow in either direction, nga lang kung mali ang polarity meron bang factor...

vague 'yung explanation sir dahil at DC, no current will flow sa capacitor. sa transient lang which is made up of frequency rich signal, not just DC. then at reverse polarity ng electrolytic capacitor DC will flow dahil malapit na siya sa short. then if we'll include zeners, they can conduct DC in both directions.

then at AC, even diodes can conduct bidirectional current in the non-linear region kung saan LC ang equivalent circuit niya, mostly used as simple mixers. some RF amplifiers can also conduct bidirectional current hence merong directivity sa S Parameters, which is S21 + S12 in dB.

memristors are also considered passive devices kahit na non-linear sila and now mostly made as a solid-state device.

[tony]

resistors, capacitors, inductors and variants thereof are passives....all else are actives...

[rdpzycho]

^ pero by definition sir, the simple diode is included as a passive device. even literatures, and almost all electronics sites, include them as passives. as well as filters and resonators such as Crystals, SAW, FBAR, Ceramic, etc.

sa Wikipedia, RLC are informally the only passives, if based on simplicity.

to be honest, I also considered diodes as an active element (by the nature they're used as mixers) up until late last month where I encountered a blog entry which diode rectifiers are passives. after some reasearch, I now consider diodes as passives.

quoting Donald G. Fink from Electronic Engineers' Handbook (sec. 3-3):
Any element which receives energy from some source other than a signal generator is an active element.
 - thus a rectifier diode will be passive since only the signal in concern is applied to it.

quoting Paul Horowitz from Art of Electronics (Diodes, p. 44):
The diode is a very important and useful two-terminal passive non-linear device.
 - on p. 53, Paul Horowitz also included electromechanical devices, and LED's and Lamps as passive devices.