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absolute pull range (APR)

Voltage-controlled oscillators such as Voltage Controlled Crystal Oscillators (VCXO) are typically coupled via a phase-locked loop (PLL) and must be able to be varied slightly in their frequency range

. These slight frequency variations are required when an output frequency changes due to temperature influences

. Thecontrol loop is then used to adjust the voltage-controlled oscillator. The

Absolute Pull Range (APR) is defined as the controllable frequency range of a VCXO with all tolerances taken into account.

The Absolute Pull Range is derived from the control characteristic, the frequency stability of the VCXO, and its aging characteristics. The APR values are in the ppm range and indicate by how many parts per million the oscillator frequency can be "pulled".

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Englisch: absolute pull range - APR
Updated at: 19.10.2013
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