homework help
02-Feb-2005, 04:44 PM
#1
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homework help
got a question here
see if you can figure it out
A TTL waveform exists between 0 and 5 V. The frequency is 31.5 Khz. The duty cycle is 86 %. The waveform is fed into an integrator with an RC = 50Ýsec. At t = 0, the TTL signal is high. Calculate the following:
a. The time period for the TTL waveform.
=31.7us
b. The time period for the high of the TTL waveform.
=27.26us
c. The time period for the low of the TTL waveform.
4.438us
d. The voltage across the capacitor at the end of the first high.
=2.101v
e. The voltage across the capacitor at the end of the first low.
=1.92v
f. The voltage across the capacitor at the end of the second high.
???? for the life of me i can't figure out F.) the answer in the book says 3.22v but i have no idea how to get it
see if you can figure it out
A TTL waveform exists between 0 and 5 V. The frequency is 31.5 Khz. The duty cycle is 86 %. The waveform is fed into an integrator with an RC = 50Ýsec. At t = 0, the TTL signal is high. Calculate the following:
a. The time period for the TTL waveform.
=31.7us
b. The time period for the high of the TTL waveform.
=27.26us
c. The time period for the low of the TTL waveform.
4.438us
d. The voltage across the capacitor at the end of the first high.
=2.101v
e. The voltage across the capacitor at the end of the first low.
=1.92v
f. The voltage across the capacitor at the end of the second high.
???? for the life of me i can't figure out F.) the answer in the book says 3.22v but i have no idea how to get it
02-Feb-2005, 05:11 PM
#2
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Join Date: Mar 2004
Posts: 1,730
after the first cycle, you have residual voltage left. use superposition. figure our how much voltage you will have after he second cycle IF you started with zero, and since it is a linear system, add it to the residual voltage, and the sum of the two is your answer.
02-Feb-2005, 06:10 PM
#4
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ERTW has it right somewhat...
you know the amount of charge left at the end of the first high (d) now calculate how much would be left after 31.7 us (assuming there is no more TL pulses) that value added to amount left after 1 high will give you the amount left after the second high. super position therom is fun. RC circuits suck ***.
Geez talk about the hard math questions.
you know the amount of charge left at the end of the first high (d) now calculate how much would be left after 31.7 us (assuming there is no more TL pulses) that value added to amount left after 1 high will give you the amount left after the second high. super position therom is fun. RC circuits suck ***.
Geez talk about the hard math questions.
03-Feb-2005, 12:44 AM
#10
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Posts: 17,846
ok so for F
use equation from question E with t = 31.7 us
then add to that the answer from D
now since I can't find one of my rcc calculators with e on it and I can't remember what it approximately equals I can't do the actual math for you but this should give you the answer thats int he book
use equation from question E with t = 31.7 us
then add to that the answer from D
now since I can't find one of my rcc calculators with e on it and I can't remember what it approximately equals I can't do the actual math for you but this should give you the answer thats int he book
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