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J. Doe
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enter image description here

The question is. What value for R1 is correct if we want the totalttotal power amplification to become 30 dB

My calculations. 30dB is amplification of 1000 times. Last circuit got amp of 15/1,5=10 times. 1000/10=100

We therefor need amp of first circuit to be 100 times.

10/R1=100

R1=0.1kohm

We could tick in 100 ohm but according to solutions manual the correct answer is 3.2kohm and I do not understand why.

enter image description here

The question is. What value for R1 is correct if we want the totalt amplification to become 30 dB

My calculations. 30dB is amplification of 1000 times. Last circuit got amp of 15/1,5=10 times. 1000/10=100

We therefor need amp of first circuit to be 100 times.

10/R1=100

R1=0.1kohm

We could tick in 100 ohm but according to solutions manual the correct answer is 3.2kohm and I do not understand why.

enter image description here

The question is. What value for R1 is correct if we want the total power amplification to become 30 dB

My calculations. 30dB is amplification of 1000 times. Last circuit got amp of 15/1,5=10 times. 1000/10=100

We therefor need amp of first circuit to be 100 times.

10/R1=100

R1=0.1kohm

We could tick in 100 ohm but according to solutions manual the correct answer is 3.2kohm and I do not understand why.

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J. Doe
  • 189
  • 1
  • 10

How to solve this. Multiple op amps circuits in series

enter image description here

The question is. What value for R1 is correct if we want the totalt amplification to become 30 dB

My calculations. 30dB is amplification of 1000 times. Last circuit got amp of 15/1,5=10 times. 1000/10=100

We therefor need amp of first circuit to be 100 times.

10/R1=100

R1=0.1kohm

We could tick in 100 ohm but according to solutions manual the correct answer is 3.2kohm and I do not understand why.