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How to design a solid state power amplifier in a few (dozen) easy steps
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<blockquote data-quote="ingenieus" data-source="post: 359630" data-attributes="member: 13716"><p>That was a quick reply. So here goes.</p><p></p><p>A brief introduction of the circuit first. Q1 and Q2 form a long tail pair (LTP) or a differential pair as the text books call it. It is also called a transconductance amplifier, because it converts voltage to current. What this all means is that the difference in the voltages on the bases of Q1 and Q2 becomes the base current for Q3.</p><p></p><p>CM is called Miller capacitor. It controls the high frequency response of the amplifier.</p><p></p><p>Q3 is a common emitter stage, which means that it can amplify voltage and it is indeed the main voltage gain element in this circuit. The output stage Q4+Q6 and Q5+Q7 are Darlington pair emitter followers. They amplify current. </p><p></p><p>The diodes D1, D2 and D3 provide the bias for the output stage, i.e. they set up the base-emitter voltages so that the transistors in the output stage are turned on. The resistor Rbias provide a way of fine tuning this.</p></blockquote><p></p>
[QUOTE="ingenieus, post: 359630, member: 13716"] That was a quick reply. So here goes. A brief introduction of the circuit first. Q1 and Q2 form a long tail pair (LTP) or a differential pair as the text books call it. It is also called a transconductance amplifier, because it converts voltage to current. What this all means is that the difference in the voltages on the bases of Q1 and Q2 becomes the base current for Q3. CM is called Miller capacitor. It controls the high frequency response of the amplifier. Q3 is a common emitter stage, which means that it can amplify voltage and it is indeed the main voltage gain element in this circuit. The output stage Q4+Q6 and Q5+Q7 are Darlington pair emitter followers. They amplify current. The diodes D1, D2 and D3 provide the bias for the output stage, i.e. they set up the base-emitter voltages so that the transistors in the output stage are turned on. The resistor Rbias provide a way of fine tuning this. [/QUOTE]
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DIY & Tutorials
DIY, Audio & Video Tutorials
How to design a solid state power amplifier in a few (dozen) easy steps
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