All Questions
Tagged with power-amplifier circuit-analysis
12 questions
0
votes
3
answers
154
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Elements of the amplifier - application and operation
I have a problem with a power amplifier from this application note.
I am wondering about the elements shown in the circuit in the "Application Circuit" section.
Can these elements be ...
3
votes
2
answers
238
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Is it a problem to connect a controlled current source in parallel to a voltage source?
Does a similar connection cause conflicts or damage?
An example of situation in which it's used. I've seen it's common practice in RF to put an inductor (RF Choke) between the drain of a MOSFET and ...
1
vote
2
answers
360
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How is a class-C amplifier useful?
As I understand, class-C amplifier can only generate signal of constant frequency and amplitude. So the question is, how can it be useful and what are its applications?
0
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0
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424
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3W/6W audio amplifier using TDA2003
I am trying to build an amplifier circuit using TDA2003, I found a common type of circuit for this purpose in almost all the websites. I tried building it in Multisim and after some seconds of ...
0
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0
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75
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Class AB power amp DC bias at the emitter
I tried using KVL to prove that indeed the DC bias at the emitter of both Q1 and Q2 is Vcc/2.
The following assumptions I made are:
R1=R2
D1,D2 and the Base-Emitter diodes of both Q1 and Q2 are ...
1
vote
1
answer
225
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Logarithmic Multi - Stage Amplifier
let's consider this logarithmic multi - stage amplifier:
Each stage is an amplifier with this mechanism: if the input signal is small (under a certain threshold), it is amplified with high gain A; if ...
0
votes
3
answers
214
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Power amplifier, does this circuit work?
I found that circuit for a power amplifier. Does it work? I want to build one for myself.
2
votes
2
answers
819
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What's wrong with my1943/5200 Mosfet Amplifier? Blown on first run
I have just brought an 1943/5200 mosfet based amplifier board. Shopkeeper said it's rated for 24-0-24 AC.
So I connected it with 24-0-24 transformer like this in image below.
As soon as I turned the ...
2
votes
1
answer
945
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What do the inductors L2 and L3 do in the following rf power amplifier circuit?
I found a circuit online about an rf power amplifier working in the 88 to 108MHz FM spectrum. The circuit diagram is shown below
I understand that an amplifier needs an inductor and a capacitor in a ...
1
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1
answer
527
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Two diodes in input stage of power amplifier
Some of the power amplifier schematics include diodes in input stage like below. What is the purpose of them?
1
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1
answer
1k
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How RF Choke doubles Vcc at collector in BJT Power Amplifier
I'm trying to analyze a class A RF power amplifier as represented in the picture. The main thing I'm trying to understand is how the collector voltage can go to 2x Vcc as according to this page. ...
0
votes
3
answers
583
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Differential stage Av value with current sources
Why all books told that Av differential of an differential input stage in power amp is very big? Ad = Rc/re, but if there are current sources in the emitter and collector circuit they will have too ...