AD8364ACPZ-R2 Analog Devices, AD8364ACPZ-R2 Datasheet - Page 38

• Manufacturer Part Number: AD8364ACPZ-R2
• Description: LF to 2.7GHz, Dual 60dB TruPwr Detector
• Manufacturer: Analog Devices

AD8364
DESCRIPTION OF CHARACTERIZATION
The general hardware configuration used for most of the
AD8362 characterization is shown in Figure 81. The signal
sources used in this example are the Rohde & Schwarz SMIQ03B
and Agilent E4438C. Input-matching baluns are used to transform
the single-ended RF signal to its differential form. Due to the
differential inputs’ sensitivity to amplitude and phase mismatch,
specific baluns were used for each characterization frequency to
achieve the best performance.
Other selected configurations are shown in Figure 82 and
Figure 83 as well.
AGILENT 8648
RF SOURCE
SOURCE
SIGNAL
SOURCE
Figure 82. Configuration for Amplitude and Phase Mismatch
SIGNAL
Figure 81. General Characterization Configuration
50Ω
–6dB SPLITTER
–3dB
–3dB
–9dB
INA
INB
CHARACTERIZATION
Characterization
–8dB
AD8364
CONTROLLER
BOARD
COMPUTER
AD8341 VECTOR
MODULATOR
AD8340 OR
OUTB
OUTP
OUTN
TEMP
OUTA
VREF
–8dB
–8dB
MINI-CIRCUITS
ZHL–42W
–6dB
–6dB
SWITCHING
AGILENT
METER/
34970A
INHA/B
INLA/B
Rev. 0 | Page 38 of 48
BASIS FOR ERROR CALCULATIONS
The slope and intercept are derived using the coefficients of a
linear regression performed on data collected in its central
operating range. Error is stated in two forms: (1) error from
linear response to CW waveform and (2) output delta from
25°C performance.
The error from linear response to CW waveform is the decibel
difference in output from the ideal output defined by the
conversions gain and output reference. This is a measure of the
linearity of the device response to both CW and modulated
waveforms. The error in dB is calculated by
where P
analogous to the input amplitude that would produce an output
of 0 V, if such an output was possible.
Error from the linear response to the CW waveform is not a
measure of absolute accuracy, since it is calculated using the
slope and intercept of each device. However, it verifies the
linearity and the effect of modulation on the device’s response.
Similarly, error from 25°C performance uses the 25°C
performance of a given device and waveform type as the
reference from which all other performance parameters shown
alongside it are compared. It is predominantly (and most often)
used as a measurement of output variation with temperature.
Error (dB) =
Z
is the x-axis intercept expressed in dBm. This is
V
OUT
−
Slope
Slope
×
(
P
IN
−
P
Z
)