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| 型號(hào)： | AD8332-EVALZ |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 19/56頁(yè) |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD8332 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | X-AMP® |
| 每 IC 通道數(shù)： | 1 - 單 |
| 放大器類型： | 可變?cè)鲆?br> |
| 輸出類型： | 差分 |
| 轉(zhuǎn)換速率： | 1100 V/µs |
| -3db帶寬： | 100MHz |
| 電流 - 輸出 / 通道： | 45mA |
| 工作溫度： | -40°C ~ 85°C |
| 電流供應(yīng)（主 IC）： | 27.5mA |
| 電壓 - 電源，單路/雙路(±)： | 4.5 V ~ 5.5 V |
| 板類型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | AD8332 |
| 產(chǎn)品目錄頁(yè)面： | 775 (CN2011-ZH PDF) |
| 相關(guān)產(chǎn)品： | AD8332ACPZ-R2-ND - IC AMP VGA PREAMP PROGR 32-LFCSP AD8332ACPZ-R7DKR-ND - IC AMP VAR GAIN 2CHAN 32-LFCSP AD8332ACPZ-R7CT-ND - IC AMP VAR GAIN 2CHAN 32-LFCSP AD8332ARUZ-R7-ND - IC AMP VAR GAIN 2CHAN 28TSSOP AD8332ACPZ-R7TR-ND - IC AMP VAR GAIN 2CHAN 32LFCSP AD8332ARUZ-RL-ND - IC AMP VAR GAIN 2CHAN 28TSSOP AD8332ACPZ-RL-ND - IC AMP VAR GAIN 2CHAN 32LFCSP AD8332ARUZ-ND - IC VGA DUAL W/PREAMP LN 28-TSSOP AD8332ACP-R2DKR-ND - IC VGA DUAL W/PREAMP LN 32-LFCSP AD8332ACP-R2CT-ND - IC VGA DUAL W/PREAMP LN 32-LFCSP 更多... |
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AD8331/AD8332/AD8334
Rev. G | Page 26 of 56
Active Impedance Matching
The LNA supports active impedance matching through an external
shunt feedback resistor from Pin LON to Pin INH. The input
resistance, RIN, is given in Equation 5, where A is the single-
ended gain of 4.5, and 6 kΩ is the unterminated input impedance.
IZ
IN
R
A
R
+
×
=
+
=
kΩ
33
kΩ
6
kΩ
6
1
(5)
CIZ is needed in series with RIZ because the dc levels at Pin LON
and Pin INH are unequal. Expressions for choosing RIZ in terms
at higher frequencies, where the loop gain is diminished, and
prevent peaking. Frequency response plots of the LNA are shown
130 MHz for matched input impedances of 50 Ω to 200 Ω and
declines at higher source impedances. The unterminated
bandwidth (when RIZ = ∞) is approximately 80 MHz.
Each output can drive external loads as low as 100 Ω in addition
to the 100 Ω input impedance of the VGA (200 Ω differential).
Capacitive loading up to 10 pF is permissible. All loads should
be ac-coupled. Typically, Pin LOP output is used as a single-ended
driver for auxiliary circuits, such as those used for Doppler
ultrasound imaging. Pin LON drives RIZ. Alternatively, a
differential external circuit can be driven from the two outputs
in addition to the active feedback termination. In both cases,
important stability considerations discussed in the Applications
Information section should be carefully observed.
The impedance at each LNA output is 5 Ω. A 0.4 dB reduction
in open circuit gain results when driving the VGA, and a 0.8 dB
reduction results with an additional 100 Ω load at the output.
The differential gain of the LNA is 6 dB higher. If the load is less
than 200 Ω on either side, a compensating load is recommended
on the opposite output.
LNA Noise
The input-referred voltage noise sets an important limit on
system performance. The short-circuit input voltage noise of
the LNA is 0.74 nV/√Hz or 0.82 nV/√Hz (at maximum gain),
including the VGA noise. The open circuit, current noise is
2.5 pA/√Hz. These measurements, taken without a feedback
resistor, provide the basis for calculating the input noise and
noise figure performance of the configurations in Figure 75.
results and the 4.1 dB noise figure (NF) measurement with the
input actively matched to a 50 Ω source. Unterminated (RIZ = ∞)
operation exhibits the lowest equivalent input noise and noise
figure. Figure 76 shows the noise figure vs. source resistance,
rising at low RS, where the LNA voltage noise is large compared
to the source noise, and again at high RS due to current noise.
The VGA input-referred voltage noise of 2.7 nV/√Hz is
included in all of the curves.
VOUT
UNTERMINATED
+
–
VIN
RIN
RS
VOUT
RESISTIVE TERMINATION
+
–
VIN
RIN
RS
VOUT
ACTIVE IMPEDANCE MATCH - RS = RIN
+
–
VIN
RIN
RIZ
1 + 4.5
RS
RIN =
03
19
9-
0
75
Figure 75. Input Configurations
7
6
5
4
3
2
1
0
50
100
1k
NO
IS
E
F
IG
UR
E
(
d
B)
RS ()
03
19
9-
0
76
INCLUDES NOISE OF VGA
RESISTIVE TERMINATION
(RS = RIN)
ACTIVE IMPEDANCE MATCH
UNTERMINATED
SIMULATION
Figure 76. Noise Figure vs. RS for Resistive,
Active Match, and Unterminated Inputs
7
6
5
4
3
2
1
0
50
100
1k
NO
IS
E
F
IG
UR
E
(
d
B)
RS ()
03
19
9-
0
77
INCLUDES NOISE OF VGA
RIN = 50
RIN = 75
RIN = 100
RIN = 200
RIZ = ∞
(SIMULATED RESULTS)
Figure 77. Noise Figure vs. RS for Various Fixed Values of RIN, Actively Matched
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