Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Non-inverting input (V)

Required number input.

Inverting input (V)

Required number input.

Compute the common mode input voltage as the average of V+ and V-. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Common mode voltage (V)

The resulting common mode voltage returned as a number.

• EMI attenuation and protection calculations depend on source and load impedance, parasitics, layout, enclosure seams, cable coupling, frequency, pulse shape, and test standard. Component impedance curves alone do not demonstrate emissions, immunity, or ESD compliance.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• Instrumentation Amplifier Cmrr Calc

  Common-mode rejection ratio in decibels from measured differential and common-mode voltage gain magnitudes.

• ADC LSB Voltage

  Calculate one ideal ADC code width as full-scale input span divided by 2^N. Full-scale span is the high-to-low range, not necessarily the reference voltage for every ADC topology.

• Voltage Attenuator Ratio

  Compute the linear voltage attenuation ratio from output over input voltage.