(This isn't actually homework, but it seemed like the right forum.
Taking a perfectly ordinary inverting opamp circuit, using equal value resistors, I know the gain will be very close to unity. But why?
The universal feedback equation says:
Closed loop gain = A / (1 + AB)
Where A is the open loop gain and B is the feedback fraction.
But in the circuit above it seems to me that the two resistors form a divider with a B of 0.5, so half of the output is fed back and the gain should be roughly 2, no unity! What am I missing?
Taking a perfectly ordinary inverting opamp circuit, using equal value resistors, I know the gain will be very close to unity. But why?
The universal feedback equation says:
Closed loop gain = A / (1 + AB)
Where A is the open loop gain and B is the feedback fraction.
But in the circuit above it seems to me that the two resistors form a divider with a B of 0.5, so half of the output is fed back and the gain should be roughly 2, no unity! What am I missing?