Non-Inverting Input Voltage Three-Row Scan - Electronic Circuits VI: Op-Amp Feedback and Exact Gain Networks Step by Step

Three input-voltage rows contrast non-inverting proportional gain with inverting gain. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.

highlighted = computed this step

One volt through gain three gives three volts

The feedback divider fixes gain 3. A 1 volt input gives 3 volts without inversion.

V_{\text{out}}=3\cdot1\ \text{V}=3\ \text{V}

Two input volts make six output volts

Only the source input changes to 2 volts. Gain 3 makes 6 volts.

V_{\text{out}}=3\cdot2\ \text{V}=6\ \text{V}

Three input volts close the proportional scan

The third source row is 3 volts, and the output is 9 volts. The sign is not flipped.

V_{\text{out}}=3\cdot3\ \text{V}=9\ \text{V}