# PPM to Frequency Conversion Calculator

This tool converts from crystal oscillator stability in terms of Parts Per Million (PPM) to the equivalent Frequency variation (Hz/kHz/MHz/GHz)

Enter

• PPM value
• Center Frequency (use the dropdown menu to select units)

The tool will provide the frequency variation and min and max values of frequency

🔁 Frequency to PPM

## Formula

The frequency variation df on either side of the center frequency F is given by

df = F*ppm*10-6

The maximum and minimum frequency are given by

Fmax = F + df

Fmin = F – df

## Example Calculation

The following 10 MHz oscillator has a frequency stability of +/- 0.1 PPM

The oscillator can be used as a reference clock with a phase locked loop to generate a frequency of 1 GHz.

Enter these numbers (0.1 PPM and 1 GHz) into the calculator above to calculate a frequency variation of +/- 25 kHz. The minimum and maximum frequencies generated are 999.975 MHz and 1000.025 MHz, respectively.

## What is PPM?

PPM, or parts per million, is a unit of measure used to describe small values of dimensionless quantities, such as the relative change in frequency or the concentration of a particular substance in a solution. In the context of frequency, PPM is used to describe the deviation or stability of a frequency source relative to its nominal value.

## The Importance of PPM in Frequency Measurements

Frequency stability is essential in many applications, particularly in communications, where the accuracy of signal transmission and reception can critically impact performance. A frequency source might be specified with a stability of, for example, ±10 PPM, meaning it can vary by 10 parts per million from the nominal frequency. This variation can affect how systems synchronize or how accurately signals are modulated or demodulated.

## Applications of PPM to Frequency Conversion

Understanding and applying PPM to frequency conversion is vital in several technical fields:

1. Telecommunications: Ensures compatibility and synchronization in networks and communication systems.
2. Broadcasting: Maintains frequency standards for clear and reliable transmission.
3. Satellite Communications: Helps in precise navigation and data transmission.
4. Scientific Instruments: Ensures accuracy in measurements and operations that depend on stable frequency references.