ECET 2310Mid-Term Exam Spring 2018 Each problem is worth 10 points. You are allo

Question

ECET 2310Mid-Term Exam Spring 2018 Each problem is worth 10 points. You are allowed 75 minutes to take this test. Show all work. You are allowed the formula sheets distributed with this exam. Turn in formula sheets with completed exam Problem #1) A BIT amplifier has low-frequency cutoffs at 2 Hz, 400 Hz, and 800 Hz a. How many dB/decade are lost between 2 Hz and 400 Hz? b. What frequency is two decades below 800 Hz? c. What frequency is three octaves above 2 Hz? d. If the mid-band gain of the amplifier is 1, what is the gain in dB at 20 Hz? e. If the mid-band gain of the amplifier is 1, what is the gain in dB at 2 Hz? Page 1 of 6

Explanation / Answer

a) db/decade means 10 times increase in freq so

2*10 = 20

20*10=200

200*10=2000 (crossed the range)

So two times.

b) 800/10=80

80/10=8

8Hz

c) Octave means 2 times increase in freq so

2*2 = 4

4*2 = 8 Hz

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