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These equations predict the RF electrical performance of Analog-to-Digital Converters. Since A/D converters are often the last stage in a receiver chain, it is extremely useful to be able to predict the contribution for noise figure, jitter, dynamic range, etc., since those values are needed for a complete cascade analysis. Be sure to note units both for the input parameters and for the equations, or you will end up with really bad results.

An A/D Converter Calculator is included in RF Cafe Calculator Workbook for FREE.

A/D input full-scale power

Power of one "q" level

Dynamic range

A/D input full-scale rms voltage

One “q” level at peak voltage

Same as above, in rms

Voltage level at “n” quantization (“q”) levels

Same as above, in rms

Power of “n” quantization (“q”) levels

Input dynamic range for “N” bits

Jitter power

Signal-to-noise ratio

Variable |
Definition |

V_{FS} |
Full-scale peak input voltage |

Jitter | Aperture jitter time |

"q" Levels | Number of "q" levels |

F_{Analog} |
Sampled analog input signal frequency |

P_{FS} |
Full-scale input power |

P_{1q} |
Power of one "q" level |

DR | Dynamic range |

V_{FS} |
Full scale input voltage |

V_{1q} |
Input voltage at one "q" levels |

V_{nq} |
Input voltage at "n" quantization ("q") levels |

# of bits | Total number of bits |

P_{Jitter} |
Power in aperture jitter |

SNR | Signal-to-noise ratio |

Related Pages on RF Cafe- A/D Converter Calculations
for RF Applications - A/D & D/A Converter Vendors |