# Trancient Analysis

Hi, I just start my 1st year college. In mechatonics major. Still newbie....
I want to ask for help...
I am going to learn about Trancient Analysis tommorow. I tried to read the book. But I confuse, how can I start to learn. When I read the Chapter, I don't understand. I already know about OP Amp, DC Circuit, also Alternating Current....But, what is the relationship between DC Circuit, AC Analysis and OP Amp with Trancient Analysis.

Thanks...Thank you so much....

Very Good Explanation can be found http://www.aplac.hut.fi/aplac/cookbook/basics/analysis.html".

Full analysis of an active circuit (transistor, opamp.. whatever) consists of three different steps:

1. DC: Basically you're computing an operating point of your circuit or a Q-point. DC values of the network that surrounds the active component determines how the active device will operate & gain etc.
2. AC: When you're done computing DC, you're now able to compute how circuit will operate over a range of frequencies, a frequency response if you will.
3. Transient: While AC analysis evaluates gain vs. frequency, the transient response evaluates voltage/current/power vs. time, in other words it is a time domain analysis (how the circuit will perform over large values of t (time)).

So without DC analysis you cannot perform a transient analysis, unless you assume something first. For instance, you can perform transient analysis / AC on a bjt/opamp circuit without dc analysis first, but you'll be forced to assume the device under investigation is operating in some mode. But if you're wrong about your assumption all other things you've performed will also be wrong.

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