15 - 13-Jun-11-7:02 PM Op Amp Examples EEL 3111 Circuits 1...

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13-Jun-11---7:02 PM Op Amp Examples 1 University of Florida, EEL 3111 – File # 15 © Dr. Eric M. Schwartz EEL 3111: Circuits 1 Op Amp Examples Today’s Menu > Cascaded Op Amp examples > Feedback modifications Today’s Class . .. University of Florida, EEL 3111 –File # 15 © Dr. Eric M. Schwartz 1 See examples on web-site: OMalley33-36, OMalley38, CascadeOpAmps2-4, ModFBOpAmp EEL 3111: Circuits 1 Op Amp Example 1 Find V O OMalley33.sch I a KCL @ node a: V O = -4(2-5) = 12V 4 2 10 6 12 0 O V University of Florida, EEL 3111 –File # 15 © Dr. Eric M. Schwartz 2 If we remove the 5k load resistor: • No change in V O ( V O is not a function of R L ) •By KCL a t V O : KCL @ node V O : Find I mA 4 . 5 5 12 4 12 0 I I mA 3 4 12 4 O V I
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13-Jun-11---7:02 PM Op Amp Examples 2 University of Florida, EEL 3111 – File # 15 © Dr. Eric M. Schwartz EEL 3111: Circuits 1 Op Amp Example 2 Find I I 1) 6V at the negative input 2) 6V at the positive input 3) 6V/3k = 2 mA 4) 0mA into positive input 5) KCL: 2mA through 4k resistor 6 2mA (4k )= 8V across 6V 14V 4mA -4mA University of Florida, EEL 3111 –File # 15 © Dr. Eric M. Schwartz 3 6) (2mA)(4k ) = 8V across 4k 7) KVL: V O = 6V+8V = 14V 8) Ohm’s: (14-6)/2k = 4mA 9) 0mA into negative input 10) I = -4mA -8V+ 2mA 2mA OMalley34.sch EEL 3111: Circuits 1 Op Amp Example 3 OMalley35.sch 1) Non-inverting Op Amp formula: a Find v L V 12 4 4 1 i F o v R v
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15 - 13-Jun-11-7:02 PM Op Amp Examples EEL 3111 Circuits 1...

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