# COMMON-MODE SIGNAL

A signal applied equally to both ungrounded inputs of a balanced amplifier stage or other differential device. Also known as in-phase signal.

## Related Terms

### OFFSET VOLTAGE

The differential input voltage that must be applied to an operational amplifier to return the zero-frequency output voltage to zero volts, due to device mismatching at the input stage.

### NONINTEGRABLE SYSTEM

A dynamical system whose motion is governed by an equation that is not an integrable differential equation.

### NAVIER'S EQUATION

A vector partial differential equation for the displacement vector of an elastic solid in equilibrium and subjected to a body force.

### MINIMAL REALIZATION

In linear system theory, a set of differential equations, of the smallest possible dimension, which have an input/output transfer function matrix equal to a given matrix function G(s).

### MEMBRANE ANALOGY

A formal identity between the differential equation and boundary conditions for a stress function for torsion of an elastic prismatic bar, and those for the deflection of a uniformly stretched membrane with the same boundary as the cross section of the bar, subjected to a uniform pressure.

### LINEAR REGULATOR PROBLEM

A type of optimal control problem in which the system to be controlled is described by linear differential equations and the performance index to be minimized is the integral of a quadratic function of the system state and control functions. Also known as optimal regulator problem; regulator problem.

### INTEGRABLE SYSTEM

A dynamical system whose motion is governed by an integrable differential equation.

### BUBBLE POINT

The differential gas pressure at which the first steady stream of gas bubbles is emitted from a wetted filter element under specified test conditions.

### BURST PRESSURE RATING

The maximum specified inside-out differential pressure that can be applied to a filter element without outward structural or filter-medium failure.

### BYPASS VALVE

A valve mechanism that assures system fluid flow when a preselected differential pressure across is exceeded; the valve allows all or part of the flow to bypass the filter element.

### Related questions

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