BME Systems & Instrumentation Exam I

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Buffer

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Inverting

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Summing

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Non-inverting

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Differential

Buffer voltages

Vo = Vi

Buffer Gain

1 (Vo = Vi)

Inverting gain

-Rf / Ri

Summing gain, from voltage

vo / (v1 + v2)

Summing gain, from resistor

-Rf / Ri

Shift

Vmax - Vmin / 2

Non inverting gain, from resistor

1 + (Rf / Ri)

Differential gain, full equation

Vo / (v2 - v1) = Rf / Ri

Common Mode Rejection Ratio

Diff gain / Common gain

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Instrumentation

Instrumentation gain, full equation

Vo / V2 - V1 = Rf/Ri * (1 + 2 R2 / R1)