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參數資料
| 型號： | AD8302ARU |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號調理 |
| 英文描述： | LF.2.7 GHz RF/IF Gain and Phase Detector |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO14 |
| 封裝： | TSSOP-14 |
| 文件頁數： | 22/24頁 |
| 文件大?。?/td> | 533K |
| 代理商： | AD8302ARU |
REV. 0
AD8302
–22–
CHARACTERIZATION SETUPS AND METHODS
The general hardware configuration used for most of the AD8302
characterization is shown in Figure 16. The characterization board
is similar to the Customer Evaluation Board. Two reference-locked
R & S SMT03 signal generators are used as the inputs to INPA
and INPB, while the Gain and Phase outputs are monitored using
both a TDS 744A oscilloscope with 10
×
high impedances probes and
Agilent 34401A multimeters.
Gain
The basic technique used to evaluate the static gain (VMAG)
performance was to set one source to a fixed level and sweep the
amplitude of the other source, while measuring the VMAG output
with the DMM. In practice the two sources were run at 100 kHz
frequency offset and average output measured with the DMM to
alleviate errors that might be induced by gain/phase modulation
due to phase jitter between the two sources.
The errors stated are the difference between a best fit line calcu-
lated by a linear regression and the actual measured data divided
by the slope of the line to give an error in V/dB. The “referred to
25
°
C error” uses this same method, while always using the slope
and intercept calculated for that device at 25
°
C.
Response measurement made of the VMAG output used the
configuration shown in Figure 17. The variable attenuator,
Alpha AD260, is driven with a HP8112A pulse generator pro-
ducing a change in RF level within 10 ns.
Noise spectral density measurements were made using a
HP3589A with the inputs delivered through a Narda 4032C
90
°
phase splitter.
To measure the modulation of VMAG due to phase variation
again the sources were run at a frequency offset, f
OS
, effectively
creating a continuous linear change in phase going through 360
°
once every 1/f
OS
seconds. The VMAG output is then measured
with a DSO. When perceivable, only at high frequencies and
large input magnitude differences, the linearly ramping phase
creates a near sinusoid output riding on the expected VMAG
DC output level. The curves in TPC 24 show the peak-to-peak
output level measured with averaging.
Phase
The majority of the VPHS output data was collected by generat-
ing phase change, again by operating the two input sources with
a small frequency offset (normally 100 kHz) using the same
configuration shown in Figure 16. Although this method gives
excellent linear phase change, good for measurement of slope
and linearity, it lacks an absolute phase reference point. In the
curves showing swept phase the phase at which the VPHS is the
same as VPHS with no input signal is taken to be –90
°
and all
other angles are references to there. Typical Performance Curves
show two figures of merit; instantaneous slope and error. Instan-
taneous slope, as shown in TPCs 43, 44, and 45 was calculated
simply by taking the delta in V
PHS
over angular change for adjacent
measurement points.
TEKTRONIX
TDS 744A
OSCILLOSCOPE
MULTIMETER/
OSCILLOSCOPE
INPA
INPB
V
MAG
V
REF
V
PHS
EVB
3dB
R & S
SIGNAL GENERATOR
SMTO3
TEKTRONIX
VX1410A
3dB
R & S
SIGNAL GENERATOR
SMTO3
HP 34401A
MULTIMETER
SAME SETUP AS
V
MAG
Figure 16. Primary Characterization Setup
INPA
INPB
V
MAG
V
REF
V
PHS
EVB
3dB
R & S
SIGNAL
GENERATOR
SMTO3
SPLITTER
VARIABLE
ATTEN
FIXED
ATTEN
TEKTRONIX
VX1410A
3dB
P
TEKTRONIX
TDS 744A
OSCILLOSCOPE
PULSE
GENERATOR
Figure 17. VMAG Dynamic Performance Measurement Setup
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