Sample problems Topic: Operational Amplifiers Statement of problem The circuit inside the shaded area is a constant current source for a limited range of values ofLR. -+LRLigiLiLR9V−9V47kΩ1.5kΩ3VFind the value of Lifor2.5LRk=Ω. Solution Due to the virtual open property at the negative port, the circuit looks like -+LiLR9V−9V47kΩ1.5kΩ3Vv−v−From the left hand side circuit, the voltage at the negative port is 3vV−=Therefore at the positive port
This is the end of the preview.
access the rest of the document.