Lecture 7: Linear Dependent Sources Today we will look at special voltage and current sources called dependent sources. A dependent source has a voltage.

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Presentation transcript:

Lecture 7: Linear Dependent Sources Today we will look at special voltage and current sources called dependent sources. A dependent source has a voltage or current that depends on a different voltage or current somewhere in the circuit (or even in a different, detached circuit).

Four Types of Linear Dependent Sources G m V c Voltage-controlled current source … I = G m V c A i I c Current-controlled current source … I = A i I c Current-controlled voltage source … V = R m I c Voltage-controlled voltage source … V = A v V c Parameter being sensed (controlling voltage/current) Constant of proportionality Output A v V c +_+_ R m I c +_+_

Analyzing Circuits with Linear Dependent Sources Circuits with linear dependent sources can be analyzed using the tools we have learned so far. A dependent voltage source acts like an independent ideal voltage source: it tells us what its voltage is, but the current is unknown. Similarly, a dependent current source tells us what its current is, but the voltage is unknown. We just need to write an extra equation that specifies what the controlling voltage or current is.

Example By Ohm’s law, V R = (R 3 )(G V X ) Extra equation specifying V X : Find V R.

Nodal Analysis with Dependent Sources R 4 I 2 R 2 I S R 3 R 1 V b + _ R m V a I 2

Floating Dependent Voltage Sources +  VaVa VbVb I2I2 | +

Linearity of I-V Relationship Whenever a circuit is composed only of the elements we have studied so far,  Ideal Independent Voltage and Current Sources  Linear Dependent Voltage and Current Sources  Resistors the I-V relationship is always a line. Simple examples: i v i v i v +_+_

Equivalent Circuits Consider the simple circuit composed of a voltage source and resistor. This circuit has a linear I-V relationship: I = (V – V S ) / RI = (1/R) V – V S / R With proper choice of V S and R, this circuit can mimic any other circuit we have studied so far. I v VSVS V S /R