Table of Contents
- 1 Are the fall time and rise time always equal?
- 2 Will these two circuits rise and fall times always be equal to each other why or why not?
- 3 How can rise and fall time be reduced?
- 4 What is rise time and fall time?
- 5 Which quantity is slower rise time or fall time?
- 6 How would you define rise time?
- 7 What is the rise time of an amplifier related to?
- 8 How do you calculate the rise time of a signal?
Are the fall time and rise time always equal?
No, time is not constant everywhere,it is relative. According to the special theory of relativity the passage of time dilates as a function of relative speed.
Are the rise and fall times equal for a logic gate?
Because the rise time and the fall time for a TTL logic circuit are equal, we will focus on just the rise time in our pursuit to choose the parameter k. Figure: Rise time and associated quantities for a TTL circuit.
Will these two circuits rise and fall times always be equal to each other why or why not?
Even if we assume, all inputs arrive at the same time, however, the two circuits rise and fall times will not be equal to each other.
Why is rise time greater than fall time?
Finally, the delay is proportional to the βn of the driving transistor so increasing the width of a transistor decreases the delay. Thus the fall time is faster than the rise time primarily due to different carrier mobilites associated with the p and n devices thus if we want tf=tr we need to make βn/βp =1.
How can rise and fall time be reduced?
From any electronic design publications, one common way to reduce rise time or one common design problem that limits the rise time is shunt capacitance and series resistance. The larger the shunt capacitance and series resistance, the longer the rise time because we know time constant = RC.
What do you understand by rise and fall times of a signal?
The frequency of a waveform is the number of times it repeats (cycles) in one second. repeats itself (goes through its cycle) 100 times each second. The rise time (or alternatively the fall time) of a signal is defined as the time it takes the waveform to transition from one peak level to the other.
What is rise time and fall time?
Rise time is typically measured from 10\% to 90\% of the value. Conversely, fall time is the measurement of the time it takes for the pulse to move from the highest value to the lowest value.
How can the rise and fall times in an inverter be equated?
Rise time is defined as the time for the circuit’s output to go from 10 percent to 90 percent of its full value, and fall time as 90 percent to 10 percent of its full value.
Which quantity is slower rise time or fall time?
8. Which quantity is slower? Explanation: Rise time is slower by a factor of 2.5 than fall time.
What affects rise time?
Factors affecting rise time For example, rise time values in a resistive circuit are primarily due to stray capacitance and inductance. Since every circuit has not only resistance, but also capacitance and inductance, a delay in voltage and/or current at the load is apparent until the steady state is reached.
How would you define rise time?
Definition of risetime : the time required for a pulse or signal (as on an oscilloscope) to increase from one specified value (as 10 percent) of its amplitude to another (as 90 percent)
What is the rise time of the circuit?
Rise time is the time separating two points on the rising edge of the signal output in response to an input step function. The 3 dB bandwidth is found by referencing the system’s frequency response.
The rise time of an amplifier is related to its bandwidth. If we know the bandwidth of the signal under test, we can choose an oscilloscope with an equal or greater system bandwidth and be confident that the oscilloscope will display the signal accurately.
Do clock buffers have the same rise and fall time?
yes the clock buffers have equal rise and fall time.Think about buffers in a clock tree. If the rise time and fall time are different, after 7 or 8 levels of tree buffers, the duty cycle at the tree leaf will be very bad.
How do you calculate the rise time of a signal?
There is an approximation that relates the rise time of a signal to its bandwidth as: BW = 0.35 T r B W = 0.35 T r In this equation, T r T r is the 10-90\% rise time of the signal. The 10-90\% rise time is the time interval it takes the signal to go from 10\% of its final value to 90\% of its final value.
Is it important that the rise and fall time be matched?
It is important that timing analysis consider all the possible combinations of rising and falling edges, but it’s not important that the rise and fall time be matched for any of those categories.