Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

How does this circuit work?

Status
Not open for further replies.

huji

Member level 4
Joined
Jul 15, 2004
Messages
76
Helped
1
Reputation
2
Reaction score
0
Trophy points
1,286
Activity points
699
how does a circuit work

Hi,
How does this circuit work? Thanks in advance.
 

pixel

Advanced Member level 2
Joined
Sep 16, 2004
Messages
511
Helped
69
Reputation
138
Reaction score
16
Trophy points
1,298
Activity points
3,993
how does an amplifier work in a circuit

Selective amplifier. From all input frequency components it will amplify only those in the range around resonant frequency wres of LC circuit.
In small analysis LC circuit is like short circuit (zero impedance) for frequencies far from resonant frequency, and like resistance R for frequency wres.
 

vicky

Full Member level 4
Joined
Aug 11, 2004
Messages
237
Helped
22
Reputation
44
Reaction score
4
Trophy points
1,298
Activity points
2,404
how does a lc circuit work

hi!

transistor is working as a common emitter amplifier.
c1 and r1 are base capacitor and resistor.
c2 and l1 working as a resonanat amplifer .
c3 working as a out put load capacitor.
this circuit tuned as regarding to the resonanat frequency of c2 l1.
 

Davood Amerion

Advanced Member level 2
Joined
Mar 1, 2005
Messages
584
Helped
116
Reputation
232
Reaction score
24
Trophy points
1,298
Location
Persia
Activity points
6,351
how does an lc circuit work

One of the imprtant things about this amplifier is that transistor Q1 work as switch.
and turn-on for less than 20%-30% of one period.
output voltage is sine wave. because of resonance cicuit L1 C2.
and another is frequency of resonance circuit must be (odd or even) multiple of input frequency.

Regards
Davood
 

ziyas

Member level 1
Joined
Dec 16, 2005
Messages
39
Helped
3
Reputation
6
Reaction score
0
Trophy points
1,286
Activity points
1,696
how does lc circuit work

huji said:
Hi,
How does this circuit work? Thanks in advance.
hi! my engineer friends explained your question very clear. I can also prefer you draw this circuit to the pspice, worbench and as this simulation programs and so you can see the responses and wave shape...
 

electronics_kumar

Advanced Member level 2
Joined
Nov 29, 2004
Messages
659
Helped
34
Reputation
68
Reaction score
9
Trophy points
1,298
Location
Tamilnadu
Activity points
5,552
having a tuned circuit is an excellant idea to avoid distortion .....and to produce excellant sinewave in the output....moreover since collector is not having a resisatnce as a load..it will decrease power dissipation ....increase in effieciency....i think it is having all charateristics of a FREQUENCY MULTIPLIER(Nothing but power amplifier Class C with tuned circuit in its load)
Next point here in class c Transistor will be biased into deeper cutoff..so that its conduction angle is less than 180angle..
 

ramy gad

Member level 4
Joined
Nov 6, 2005
Messages
74
Helped
5
Reputation
10
Reaction score
1
Trophy points
1,288
Activity points
1,916
it is simply a class C power amp
also it can be used as a freq multiplier
there is a negative bias so that only the peaks can open the transistor
take care to not exceed the max base emitter voltage:D
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top