For a common emitter transistor amplifier the audio signals...

For a common emitter transistor amplifier , the audio signals voltage across the collector resistance of 2kohm is 2V. Suppose the current amplification factor of the transistor is 100. Find the input signal voltage and base current, if the base resistance is 1Kohm.

Transcript

00:01 Hello in the question it is given for a common emitter transistor amplifier.

00:05 The audio signal voltage across the collector resistance is 2 kilo -oom.

00:12 That is resistance across the collector.

00:22 So let us consider this as resistance suffix c.

00:26 That is equal to 2 kilo -oom and the voltage is 2 -volt for this.

00:34 This one that is a voltage across rc so we can two voltage the voltage across rc that is resistance of the collector suppose the current amplification factor of the transistor is the hundred so current amplification factor is denoted by beta so that is equal to hundred and we need to find the input signal voltage and base current so base current is ib so that value as well as input signal voltage that is vn value if the base resistance is 1 kilo -oom so base resistance is given that is rb value base resistance r suffix b is equal to 1 kilo -oom that is nothing but 1 ,000 ome so using these values we need to find out base current as well as input signal voltage.

01:40 So first we will calculate base current that is ib is equal to we have the equation collector current divided by beta where beta is the amplification factor of the transistor and ic is a collector current but we don't have the value of collector correct so first we need to calculate that value using voltage across rc divided by rc that is 2 volt divided by 2 kilowolm so collector current is equal to 1 millie ampere so now we can substitute here in this equation that is 1 millie ampere divided by 100 that is here 1 into 10 to power minus 3 divided by 100 can be written as 10 to the power 2 so 10 to the 4 minus 3 into 10 to 4 minus 2, that is nothing but 10 to the power minus 5 and the unit is ampere...

Question

For a common emitter transistor amplifier , the audio signals voltage across the collector resistance of 2kohm is 2V. Suppose the current amplification factor of the transistor is 100. Find the input signal voltage and base current, if the base resistance is 1Kohm.

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