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A/D Converter Calculations for RF Applications

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 equation   A/D input full-scale power

Power of one "q" level equation  Power of one "q" level

Dynamic range equation  Dynamic range

A/D input full-scale rms voltage equation  A/D input full-scale rms voltage

One “q” level at peak voltage equation  One “q” level at peak voltage

One “q” level at peak voltage in rms equation  Same as above, in rms

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

Voltage level at “n” quantization (“q”) levels in rms equation  Same as above, in rms

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

Input dynamic range for “N” bits equation  Input dynamic range for “N” bits

Jitter power equation  Jitter power

Signal-to-noise ratio equation  Signal-to-noise ratio


Variable Definition
VFS Full-scale peak input voltage
Jitter Aperture jitter time
"q" Levels Number of "q" levels
FAnalog Sampled analog input signal frequency
PFS Full-scale input power
P1q Power of one "q" level
DR Dynamic range
VFS Full scale input voltage
V1q Input voltage at one "q" levels
Vnq Input voltage at "n" quantization ("q") levels
# of bits Total number of bits
PJitter 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

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