Prévia do material em texto
Step of 8 8.024E Refer to Figure 6. 19 in the text Find the trans-conductance, 8m2 of the npn transistor. 0.2x10⁻³ 8 mA/V Find the value 100 = Step of 8 Find the value 5 = Find the value 5 = Step of 8 The output resistance for npn transistor is, Substitute 25 25 8 mA/V for and 12.5 312.5x10 = (200) Therefore, the output resistance for npn transistor is Step 8 Find the of the pnp transistor. 8m3 0.2x10⁻³ 8 mA/V Find the value 8m3 50 = =6.25kQ Step Find the value 4 = Find the value 4 = Step of 8 The output resistance for pnp transistor is, Substitute 20 8 mA/V for 8m2 and 20 0.762 Therefore, the output resistance of the pnp transistor is 762 Step of 8 Write the expression for the voltage gain, 2.432 Hence, the voltage gain of the BJT cascode amplifier is -4186 V/V -4186 Step of 8 Write the expression for the maximum available gain Substitute = = = and = Therefore, the value of the maximum achievable gain is -5714.28 V/V