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lesson15

lesson15 - Lesson 15 Dependent Sources#3(Section 4-2(CLO...

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10 V 100 k V OUT 150 k 50V X + _ 1 k 2.2 k + _ V X + _ R IN I IN V IN R F A Lesson 15 – Dependent Sources #3 (Section 4-2) (CLO 4-1) This lesson looks at input and output resistance of a dependent source circuit. A very important concept involves the effect of feedback on R IN and R OUT . If there is no feedback resistor, the input resistance is simply = = IN IN IN R I V / 250 k . However, if we add R F to the circuit, R IN changes. k V I 100 10 X IN - = But last lesson we found that F X 3060 1 6 R k V + = So that F F N IN IN 3060 1 6 10 1000 100 3060 1 6 10 10 R k k k R k I V R I + - = + - = = Again, we can build a table that relates R IN to R F . The input resistance changes by 2.5 times depending on R F . There are two points to be made: First, the input resistance varies with feedback and second, the designer has control of the input resistance to some extent. The last concept involves finding a Thévenin Equivalent circuit as seen by the 2.2 k load. Without elaboration we would get F X T OC 3060 1 300 50 R k V V V + - = - = =

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