ECE/ENGRD 2100
Introduction to Circuits for ECE
Lecture 33
Additional Dynamic Op-Amp Circuits
ECE/ENGRD 2100 2
Announcements
• Recommended Reading:– Textbook Chapter 7.7 and Chapter 8.5
• Upcoming due dates:– Lab report 5 due by 11:59 pm on Friday April 19, 2019– Homework 5 due by 11:59 pm on Friday April 26, 2019– Prelab 6 due by 11:59 pm on Friday April 26, 2019
ECE/ENGRD 2100 3
Differentiation – First Attempt
𝑣"# 𝑡 𝑣%&' 𝑡𝑑𝑑𝑡
ECE/ENGRD 2100 4
Differentiation – Second Attempt
𝑣"# 𝑡 𝑣%&' 𝑡𝑑𝑑𝑡
ECE/ENGRD 2100 5
Current-to-Voltage Conversion using Op-Amp
+
−
𝑖"#−
+𝑣%&'
R
ECE/ENGRD 2100 6
Better Differentiation
𝑣"# 𝑡 𝑣%&' 𝑡𝑑𝑑𝑡
+
−
𝑣"#−
+𝑣%&'
ECE/ENGRD 2100 7
Integration – First Attempt
𝑣"# 𝑡 𝑣%&' 𝑡- 𝑑𝑡.
/0
ECE/ENGRD 2100 8
Integration – Second Attempt
𝑣"# 𝑡 𝑣%&' 𝑡- 𝑑𝑡.
/0
ECE/ENGRD 2100 9
Voltage-to-Current Conversion using Op-Amp
+
−
𝑣"#−
+𝑣%&'
R
ECE/ENGRD 2100 10
Better Integration
𝑣"# 𝑡 𝑣%&' 𝑡- 𝑑𝑡.
/0
+
−
𝑣"#−
+𝑣%&'
ECE/ENGRD 2100 11
Negative Impedance Converter (NIC)
+
−V2"#−
+V2%&'
R3
R4Z
ECE/ENGRD 2100 12
Ideal Oscillator using NIC
+
−
R4
R4R
ECE/ENGRD 2100 13
Gyrator using NIC
+
−R4
R4R+
−
R4
R4R
Z
R
ECE/ENGRD 2100 14
Gyrator using NIC (Cont.)
+
−R4
R4R+
−
R4
R4R
Z
R
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