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Step 9 7.022E Refer to the Example in the textbook for data Base current is reduced to half of the value of base current of the amplifier in Example 8. Hence, collector current is halved for new amplifier circuit since common emitter current gain is constant. Collector current of the amplifier circuit in example 7.8 is 1 mA Hence, the collector current of new designed amplifier circuit is 0.5 mA Step of 9 Determine transconductance The transconductance is, Substitute 0.5 mA for Ic 25 mV for in equation. 0.5 mA 25 mV 20 mA/V Thus, transconductance 8m is 20 mA/V Step of Determine The resistance is, 8m Substitute 100 for for in equation. 100 20 mA/V Determine input resistance Substitute 5 kΩ for in equation Therefore, the input resistance is Step of Collector resistance is doubled. New collector resistance is 10 Determine the voltage gain The voltage gain is, Substitute 20 mA/V for 8. and 10 for in equation. =-200 V/V Therefore, the voltage gain is -200 V/V Step 9 Determine the output resistance Output resistance R. is equal to collector resistance Substitute for in equation. Therefore, the output resistance R. is Step 9 Determine the voltage gain Voltage gain is given by, Substitute 20 mA/V for for Rc 5 for in equation. =-66.7 V/V Therefore, the voltage gain is -66.7 V/V Step of Determine the overall voltage gain G, G. [4,] Substitute 5 kΩ for 5 kΩ for -66.7 V/V for A, in equation. -33.3 V/V Therefore, the overall voltage gain is -33.3 V/V -33.3 V/V Step of 9 Determine signal voltage Substitute 5 mV for 5 for for in equation. = mV Therefore, the signal voltage is 10 mV Step of Determine the output Substitute 33.3 V/V for G, and 10 mV for in equation. Therefore, the output voltage IS 0.33 V

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