ECE 231 -2

ECE 231 -2 - ECE-231 Circuits and Systems I Spring 2011...

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Unformatted text preview: ECE-231 Circuits and Systems I Spring 2011 Session 2 Professor Stewart Personick Office: ECEC Room 321 [email protected] Controlled Sources 10000 Ω i2 node e 0.1 volt (voltage source) i3 node b- + 2500 Ω 7500 Ω node a i4 10000 Ω node c Controlled current source: i = β x i2 example: β = 100 Controlled Sources: Current controlled Current Source 10000 Ω i2 node e 0.1 volt (voltage source) i3 node b- + 2500 Ω 7500 Ω node a i4 10000 Ω node c Controlled current source: i = β x i2 example: β = 100 Controlled Sources: Current controlled Current Source i2 = 0.1 Volts /(7500 Ω + 2500 Ω ) = 0.00001 Amperes = 10 microAmperes i2 node e 0.1 volt (voltage source) node b- + 2500 Ω 7500 Ω node a I5=i3+i4 5000 Ω node c Controlled current source: i = β x i2 example: β = 100 10000 Ω in parallel with 10000 Ω = 5000 Ω Controlled Sources: Current controlled Current Source i2 = 0.1 Volts /(7500 Ω + 2500 Ω ) = 0.00001 Amperes = 10 microAmperes Controlled Sources: Current controlled Current Source i2 node e 0.1 volt (voltage source) node b- + 2500 Ω 7500 Ω node a i5=i3+i4 5000 Ω node c Controlled current source: i = β x i2 example: β = 100 i2 = 0.1 Volts /(7500 Ω + 2500 Ω ) = 0.00001 Amperes = 10 microAmperes vce = i5 x 5000 Ω = -i x 5000 Ω = - 100 x 10 microAmperes x 5000 Ω = -5 Volts Controlled Sources: Current controlled Current Source i2 node e 0.1 volt (voltage source) node b- + 2500 Ω 7500 Ω node a I5=i3+i4 5000 Ω node c Controlled current source: i = β x i2 example: β = 100 i2 = 0.1 Volts /(7500 Ω + 2500 Ω ) = 0.00001 Amperes = 10 microAmperes vce = -100 x 10 microAmperes x 5000 Ω = -5 Volts The application of a 0.1 Volt “input voltage” (between node a and node e) results in a -5 Volt “output voltage” (between node c and node e). The circuit produces a “voltage amplification ratio” of: -50, between it’s input and its output . Transistor circuit (grounded emitter) b c e- + 10000 Ω ( power supply feeder resistance) 7500 Ω 10000 Ω (input resistance of the next amplifier stage) To voltage source (power supply) i2-i3-i4 The collector current (-i3 - i4) = β x the base current (i2 + i1). A typical value of β = 100 To base “bias” current source i1 vs Input signal Output signal node e 0.1 volt (voltage source) node b- + 5000 Ω node a 5000 Ω node c Controlled voltage source: v = 100 vae +- i1 Controlled Sources: Voltage controlled Voltage Source node e 0.1 volt (voltage source) node b- + 5000 Ω node a 5000 Ω node c Controlled voltage source: v = 100 vae +- i1 i1 = -99 x 0.1 Volts / 10000 Ohms = -0.00099 Amperes KVL: 5000 Ω x i1 + 5000 Ω x i1 + 100vae - vae = 0 vae = 0.1 Volt Two (2) equations and two (2) unknowns Controlled Sources: Voltage controlled Voltage Source The controlled voltage source, E1, has a value which is: 100 x the voltage from + to - on its control voltage terminals....
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This note was uploaded on 03/26/2012 for the course ECE 231 taught by Professor Pietrucha during the Spring '08 term at NJIT.

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ECE 231 -2 - ECE-231 Circuits and Systems I Spring 2011...

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