Contents
Why is rise time important in high speed electronics?
Rise time is an analog parameter of fundamental importance in high speed electronics, since it is a measure of the ability of a circuit to respond to fast input signals. There have been many efforts to reduce the rise times of circuits, generators, and data measuring and transmission equipment.
What causes the rise time of a load switch?
Rise Time is affected by many operating conditions and external components around a load switch. The main factors are: Slew Rate , Load Resistance , Input Voltage and Bias Voltage .
What is rise time in a digital signal?
Rise time is the time taken for a signal to cross a specified lower voltage threshold followed by a specified upper voltage threshold. This is an important parameter in both digital and analog systems.
How to calculate BJT rise time for switching applications?
Assuming Rb = 1k, from datasheet I found Vbe (on) = 1.4V, Raspberry GPIO pin output is Vpin = 3.3V, then: Ib = (Vpin – Vbe (on))/ Rb = 1.9 mA (which is well below the maximum output current of GPIO pins, so I’m good). The ratio Ic/Ib = 210; from datasheet h F E, m i n = 30000.
Why does rise time occur in a resistive circuit?
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 to calculate the rise time of a system?
To determine the 10% to 90% rise time of the system it is necessary to solve for time the two following equations: By using known properties of the error function, the value t = – t1 = t2 is found: since tr = t2 – t1 = 2t ,
What’s the rise time for an overdamped system?
For overdamped second order systems, the 0% to 100% rise time is normally used, and for underdamped systems (…) the 10% to 90% rise time is commonly used”.