− − −− − − RF Cafe in Morse Code: Hear It
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.
At the bottom of the page is an interactive calculator based on the Microsoft Office Web Components (OWC), which allows an Excel spreadsheet to be embedded on the page.
A/D input full-scale power
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
Note: Thanks to John P. for pointing out jitter power equation discrepancy that omitted the input resistance.
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
This calculator uses the above equations Office Web Components (OWC) are required for this calculator to function.
Note: Numbers shown are NOT total page views; they are unique IP addresses for each 24-hour period (i.e., unique visitors). Typical page view counts are at least twice the reported unique visitor number.
RF Cafe Erie, PA (814) 833-1967
A Disruptive Web Presence GPS Coordinates: N 42°04.577', W 080°11.757'
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
