These
equations predict the RF electrical performance of AnalogtoDigital 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 fullscale power
Power of one "q" level
Dynamic range
A/D input fullscale 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
Signaltonoise ratio
Variable 
Definition 
V_{FS} 
Fullscale peak input voltage 
Jitter 
Aperture jitter time 
"q" Levels 
Number of "q" levels 
F_{Analog} 
Sampled analog input signal frequency 
P_{FS} 
Fullscale 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 
Signaltonoise ratio 
