Calculate Number of Pulses ?

  • Thread starter mym786
  • Start date
In summary, the conversation is about determining the number of clock pulses counted into the register for an ADC system using a 1 MHz clock and a ramp voltage that increases from 0V to 1.25V in 125ms. The solution provided by the professor gives the answer of 900 and 750 for Vi values of 0.9V and 0.75V respectively, but the questioner believes the answer should be 90000 and 75000.
  • #1
mym786
11
0

Homework Statement



The Analog-To-Digital Converter “ADC” system shown in Fig. 1 uses 1 MHZ clock generator and a ramp voltage that increases from 0V to 1.25 V in a time 125 ms.
Determine the number of clock pulses counted into the register
when Vi=0.9 V
and when it is 0.75 V


Homework Equations





The Attempt at a Solution




VR = 1.25 v TR =125 ms
Vi=0.9 V
t1= tr/Vr * Vi = 125ms *0.9 V / 1.25 V = 90 ms
T= 1/f = 1/ 1 Mz = 1μs
N = t1 / T = 90 ms / 1 μs =900
Vi=0.75 V
t1= tr/Vr * Vi = 125 ms *0.75 V / 1.25 V = 75 ms
N = t1 / T = 75 ms / 1 μs =750*




This is the solution of the problem by my prof. My question why N = 90ms/1μs = 900 and NOT 90000 ? The same goes for 750.

Thank you very much.
 

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  • #2
mym786 said:

Homework Statement



The Analog-To-Digital Converter “ADC” system shown in Fig. 1 uses 1 MHZ clock generator and a ramp voltage that increases from 0V to 1.25 V in a time 125 ms.
Determine the number of clock pulses counted into the register
when Vi=0.9 V
and when it is 0.75 V


Homework Equations





The Attempt at a Solution




VR = 1.25 v TR =125 ms
Vi=0.9 V
t1= tr/Vr * Vi = 125ms *0.9 V / 1.25 V = 90 ms
T= 1/f = 1/ 1 Mz = 1μs
N = t1 / T = 90 ms / 1 μs =900
Vi=0.75 V
t1= tr/Vr * Vi = 125 ms *0.75 V / 1.25 V = 75 ms
N = t1 / T = 75 ms / 1 μs =750*




This is the solution of the problem by my prof. My question why N = 90ms/1μs = 900 and NOT 90000 ? The same goes for 750.

Thank you very much.

I get the same answers as you. A 1MHz clock has a 1us period.
 
  • #3
berkeman said:
I get the same answers as you. A 1MHz clock has a 1us period.

The number of pulses I get is 112 bpm, but that's not important now. The division really should give 90000 as a result, not 900.
 
  • #4
Char. Limit said:
The number of pulses I get is 112 bpm, but that's not important now. The division really should give 90000 as a result, not 900.

You just finish working out? My pulse was near that at the end of a 200m IM at noon :wink:

Oops, [/hijack]
 
  • #5


The reason why N = 90 ms / 1 μs = 900 and not 90000 is because the unit "ms" stands for milliseconds, which is equal to 0.001 seconds. The unit "μs" stands for microseconds, which is equal to 0.000001 seconds. Therefore, when you divide 90 ms by 1 μs, you are essentially dividing by 0.000001, which results in the value of 900. The same logic applies for the calculation of 750. It is important to pay attention to the units when performing calculations to ensure accurate results.
 

1. How do I calculate the number of pulses?

To calculate the number of pulses, you will need to know the frequency of the pulses and the length of time they occur for. Simply multiply the frequency by the duration to get the total number of pulses.

2. What is the unit of measurement for the number of pulses?

The unit of measurement for the number of pulses is typically represented as "pulses" or "counts". However, it can also be measured in other units such as revolutions or cycles depending on the type of pulse being counted.

3. Can I use any type of pulse to calculate the number of pulses?

Yes, you can use any type of pulse to calculate the number of pulses as long as you know the frequency and duration. This includes electronic pulses, mechanical pulses, and even biological pulses like heartbeats.

4. What are some common applications for calculating the number of pulses?

Calculating the number of pulses is commonly used in fields such as engineering, physics, and biology. It is essential for measuring speed, distance, and other variables in various systems and processes.

5. What is the significance of calculating the number of pulses?

Calculating the number of pulses allows us to accurately measure and track various processes and systems. It also helps us understand the frequency and patterns of certain events, which is crucial in many scientific studies and experiments.

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