physics-class-12-unit-14-chapter-07-bipolar-junction-transistor-basics-l-7-8-2kjxyevsy28

<p><Success style="float:center;text-align:center;font-size:28px;" ><B>Bipolar Junction Transistor Basics</B></Success></p>
<p><Primary style="float:center;text-align:center;font-size:24px;"><B>Biopolar Juntion Transistor(BJT)</B></Primary></p>
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<p>Transfer + Resistor $\Rightarrow$Transfer of current from a low resistance part to a high-resistance part</p>
<p>p-n junction in forward bias $\Rightarrow$ Low resistance</p>
<p>In reverse bias $\Rightarrow$ Large resistance</p>
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<span style="color:blue">Bio polar Junction Transistor(BJT)</span>$\to$ Doping$\to$Transistor$\to$Common Emitter$\to$Common Base$\to$Working of a Transistor$\to$Transistor$\to$Common Base Emitter
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<p><Success style="float:center;text-align:center;font-size:28px;" ><B>Bipolar Junction Transistor Basics</B></Success></p>
<p><Primary style="float:center;text-align:center;font-size:24px;"><B>Doping</B></Primary></p>
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<p>Emitter $\rightarrow$ High doping</p>
<p>Base $\rightarrow$ Lightly doped</p>
<p>Collector $\rightarrow$ Moderably doped</p>
<p>Base $\rightarrow$ Thin $\sim$ micrometers</p>
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<p><Success style="float:center;text-align:center;font-size:28px;" ><B>Bipolar Junction Transistor Basics</B></Success></p>
<p><Primary style="float:center;text-align:center;font-size:24px;"><B>Transistor</B></Primary></p>
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<p>p-n junction</p>
<p>Emitter, one puts an arrow</p>
<p>Arrow should go from p-side to n-side</p>
<p>Emittter base junction forward bias</p>
<p>Common Emitter modes</p>
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<p><Success style="float:center;text-align:center;font-size:28px;" ><B>Bipolar Junction Transistor Basics</B></Success></p>
<p><Primary style="float:center;text-align:center;font-size:24px;"><B>Common Emitter</B></Primary></p>
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<p>Common Emitter modes</p>
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<p><Success style="float:center;text-align:center;font-size:28px;" ><B>Bipolar Junction Transistor Basics</B></Success></p>
<p><Primary style="float:center;text-align:center;font-size:24px;"><B>Working of a Transistor</B></Primary></p>
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<p>Base in lightly doped</p>
<p>Emitter is heavily doped</p>
<p><strong>Typically</strong></p>
<p>$I_c \approx$ 0.95 to 0.98</p>
<p>$B_{dc} = \frac{I_c}{I_B}  \sim$ 20 to 50</p>
<p>$B_{ac} = \frac{\Delta I_c}{\Delta I_B}$</p>
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<p><Success style="float:center;text-align:center;font-size:28px;" ><B>Bipolar Junction Transistor Basics</B></Success></p>
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<p>$B_{dc} = \frac{I_c}{I_B}  \sim$ 20 to 50</p>
<p>$B_{ac} = \frac{\Delta I_c}{\Delta I_B}$</p>
<p>$I_c»I_b$</p>
<p>$I_c \lesssim I_E$</p>
<p>$B_{ac} \approx B{dc}$</p>
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<p><Success style="float:center;text-align:center;font-size:28px;" ><B>Bipolar Junction Transistor Basics</B></Success></p>
<p><Primary style="float:center;text-align:center;font-size:24px;"><B>Common Base Emitter</B></Primary></p>
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<p><Success style="float:center;text-align:center;font-size:28px;" ><B>Bipolar Junction Transistor Basics</B></Success></p>
<p><Primary style="float:center;text-align:center;font-size:24px;"><B>Common Base Emitter</B></Primary></p>
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<p>p-n Junction</p>
<p>I-V characterstics</p>
<p>Input characterstics: $I_B - V_{BE}$</p>
<p>Output characterstics: $I_c - V_0$</p>
<p>$V_0 - V_c$ (Transfer characterstics)</p>
<p>$V_{BE} = V_C $(Output voltage)</p>
<p>$I_B$ = (Input current)</p>
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