ECE201_28_Thevenin_Op-Amps

ECE201_28_Thevenin_O - ECE 201 Lecture 28 Thevenin/Norton Equivalents for Circuits with Op-Amps Announcements • Last Lecture#27 – Examples

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Unformatted text preview: ECE 201 Lecture 28 Thevenin/Norton Equivalents for Circuits with Op-Amps Announcements • Last Lecture #27: – Examples: Summing circuit Difference circuit Preamplifier – Saturation – A/D and D/A converters • This Lecture #28: – Thevenin’s and Norton’s Theorems for operational amplifiers Saturation: Piecewise linear approximation Typical open-loop gain (A) range: 10 4 to 10 7 Example for saturation • Guess and Check Calculate Check if + + V in R 1 =10 k Ω R f =50 k Ω V dc-V dc 15 dc sat dc V V V V = = A = ∞ sat out sat V V V- ≤ ≤ Find V out and V d =V +-V- for the following cases: V in = 0.5 V, 4 V, and -4 V 1 f out in R V V R = - Guess and Check 0.5 in V V = 15 out V V = - 0.83 0 ! d V V V = - ≠ 4 in V V = 2.5 out V V = - 4 in V V = - 15 out V V = 0.83 0 ! d V V V = ≠ d V V = Plot of the output response Digital-to-Analog Converters (D/A) 2.5 3.5 x ≤ < 1 1 1 1 [ 2 2 2 ] n out n v b b b E-- = + + + L 2.5 3.5 x ≤ < x y y= 011 Some info is lost Quantization: An example of D/A converter A digital switch 16 2 E I R = • A D/A converter based on resistive ladder network....
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This note was uploaded on 01/12/2012 for the course ECE 201 taught by Professor All during the Fall '08 term at Purdue University-West Lafayette.

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ECE201_28_Thevenin_O - ECE 201 Lecture 28 Thevenin/Norton Equivalents for Circuits with Op-Amps Announcements • Last Lecture#27 – Examples

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