The incremental output frequency change produced by an incremental change in supply voltage ( MHz/ V). If supply voltage ripple, frequency range and amplitude are not specified, measurements will be conducted at a DC rate.

Every oscillator needs a power supply.

Oscillator output power must come from somewhere—typically, this somewhere is a D.C. voltage source.

Unfortunately, the operating frequency ω₀ of an oscillator is sensitive to this supply voltage. In other words, as the D.C. supply voltage changes, the output frequency can also change.

This phenomenon is called frequency pushing.

Frequency pushing is expressed in terms of Hz/V or Hz/mV, and can be either a positive or negative value.