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參數資料
| 型號： | AD8370-EVAL |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 運動控制電子 |
| 英文描述： | LF to 750 MHz Digitally Controlled VGA |
| 中文描述： | LF到750兆赫數字控制VGA |
| 文件頁數： | 24/28頁 |
| 文件大小： | 1043K |
| 代理商： | AD8370-EVAL |
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AD8370
APPENDIX
CHARACTERIZATION EQUIPMENT
An Agilent N4441A Balanced Measurement System was used to
obtain the gain, phase, group delay, reverse isolation, CMRR,
and s-parameter information contained in this data sheet. With
the exception for the s-parameter information, T-attenuator
pads were used to match the 50 impedance of this instrument’s
ports to the AD8370. An Agilent 4795A Spectrum Analyzer was
used to obtain nonlinear measurements IMD, IP3, and P1dB
through matching baluns and/or attenuator networks. Various
other measurements were taken with setups shown in this
section.
Rev. 0 | Page 24 of 28
COMPOSITE WAVEFORM ASSUMPTION
The nonlinear two-tone measurements made for this data sheet,
i.e., IMD and IP3, are based on the assumption of a fixed value
composite waveform at the output, generally 1 V p-p. The fre-
quencies of interest dictate the use of RF test equipment, and
because this equipment is generally not designed to work in
units of volts, but rather watts and dBm, an assumption was
made to facilitate equipment setup and operation. Two sinusoidal
tones can be represented as
V
1
= V sin
(2
∏
f
1
t
)
V
2
= V sin
(2
∏
f
2
t
)
The RMS average voltage of one tone is
2
1
)
(
1
T
2
0
=
∫
dt
V
T
1
where
T
is the period of the waveform. The RMS average
voltage of the two-tone composite signal is
1
)
(
1
T
2
0
=
+
∫
dt
V
V
2
T
1
It can be shown that the average power of this composite
waveform is twice (3 dB) that of the single tone. This also means
that the composite peak-to-peak voltage is twice (6 dB) that of a
single tone. This principle can be used to set correct input
amplitudes from generators scaled in dBm and is correct if the
two tones are of equal amplitude and are reasonably close in
frequency.
DEFINITIONS OF SELECTED PARAMETERS
Common-mode rejection ratio (Figure 26) has been defined for
this characterization effort as
Gain
Mode
Common
Gain
Mode
al
Differenti
where the numerator is the gain into a differential load at the
output due to a differential source at the input, and the
denominator is the gain into a differential-mode load at the
output due to a common-mode source at the input. In terms of
mixed-mode s-parameters, this equates to
SDC21
SDD21
More information on mixed-mode s-parameters can be
obtained in a reference by Bockelman, D.E. and Eisenstadt,
W.R.,
Combined Differential and Common-Mode Scattering
Parameters: Theory and Simulation
. IEEE Transactions on
Microwave Theory and Techniques, v 43, n 7, 1530 (July 1995).
Reverse isolation (Figure 24) is defined as SDD12.
Power supply rejection ratio (PSRR) has been defined as
s
dm
A
A
where
A
dm
is the differential mode forward gain (SDD21), and
A
s
is the gain from the power supply pins (VCCI and VCCO,
taken together) to the output (OPLO and OPHI, taken differen-
tially), corrected for impedance mismatch. The following
reference provides more information: Gray, P.R., Hurst, P.J.,
Lewis, S.H. and Meyer, R.G.,
Analysis and Design of Analog
Integrated Circuits
,
4
th
Edition
, John Wiley & Sons, Inc., page 422.
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