![]() For voltage controlled sources these act like an open-circuit voltage measurement in parallel with the controlling voltage. Just as there are two kinds of independent sources (voltage and current), there are four basic types of dependent sources: their output can be either voltage or current, AND their input can be either voltage or current.Įach dependent source has two output terminals, just like an independent source would.Įach dependent source also has two input terminals, thought these are not always explicitly shown. ![]() Voltage and current are the two primary state variables in an electronic system. Many transistor situations can be modeled as though a small controlling current or voltage signal at one terminal can control a much larger current or voltage at another terminal. These dependent sources are important to understand because they’re how we model and analyze more complicated components, like transistors. In particular, we’ll consider linear dependent sources, which have a value proportional to their controlling value, related only by some scaling constant. ![]() In this section, we’ll now consider dependent sources, which have a voltage or current value that is controlled by some voltage or current value elsewhere in the circuit. Our previous discussion of ideal voltage and current sources exclusively considered independent sources, which had a fixed specified voltage or current regardless of whatever else was going on in a circuit. Sources that are proportional to other currents or voltages in the circuit. ![]()
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