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参数资料
| 型号： | AD8341 |
| 厂商： | Analog Devices, Inc. |
| 元件分类： | 调制器/解调器 |
| 英文描述： | 1.5 GHz to 2.4 GHz RF Vector Modulator |
| 中文描述： | 1.5 GHz至2.4 GHz射频矢量调制器 |
| 文件页数： | 17/20页 |
| 文件大小： | 556K |
| 代理商： | AD8341 |
AD8341
EVALUATION BOARD
The evaluation board circuit schematic for the AD8341 is
shown in Figure 41.
Rev. 0 | Page 17 of 20
The evaluation board is configured to be driven from a
single-ended 50 source. Although the input of the AD8341 is
differential, it may be driven single-ended, with no loss of per-
formance.
The low-pass corner frequency of the baseband I and Q chan-
nels can be reduced by installing capacitors in the C11 and C12
positions. The low-pass corner frequency for either channel is
approximated by
pF
0.5
nF
10
kHz
45
C
f
3dB
+
×
≈
FLT
On this evaluation board, the I and Q baseband circuits are
identical to each other, so the following description applies
equally to each. The connections and circuit configuration for
the Q baseband inputs are described in Table 4.
The baseband input of the AD8341 requires a differential volt-
age drive. The evaluation board is set up to allow such a drive by
connecting the differential voltage source to QBBP and QBBM.
The common-mode voltage should be maintained at approxi-
mately 0.5 V. For this configuration, Jumpers W1 through W4
should be removed.
The baseband input of the evaluation board may also be driven
with a single-ended voltage. In this case, a bias level is provided
to the unused input from Potentiometer R10 by installing either
W1 or W2.
Setting SW1 in Position B disables the AD8341 output amplifier.
With SW1 set to Position A, the output amplifier is enabled.
With SW1 set to Position A, an external voltage signal, such as a
pulse, can be applied to the DSOP SMA connector to exercise
the output amplifier enable/disable function.
Table 4. Evaluation Board Configuration Options
Components
Function
R7, R9, R11,
R14, R15, R19,
R20, R21, C15,
C19, W3, W4
For single-ended baseband drive, the Potentiometer R11 can be used to provide a bias level
to the unused input (install either W3 or W4).
Default Conditions
R7, R9 = Not Installed
R11 = Potentiometer, 2 k,
10 Turn (Bourns)
R14 = 4 k (Size 0603)
R15 = 44 k (Size 0603)
R19, R20, R21 = 0
(Size 0603)
C15, C19 = 0.1 μF
(Size 0603)
W3 = Jumper (Installed)
W4 = Jumper (Open)
R1, R3 = Not Installed
R10 = Potentiometer, 2 k,
10 Turn (Bourns)
R12 = 4 k (Size 0603)
R13 = 44 k (Size 0603)
R16, R17, R18 = 0
(Size 0603)
C16, C20 = 0.1 μF
(Size 0603)
W1 = Jumper (Installed)
W2 = Jumper (Open)
C11, C12 = Not Installed
I Channel Baseband Interface
. Resistors R7 and R9 may be installed to accommodate a
baseband source that requires a specific terminating impedance. Capacitors C15 and C19
are bypass capacitors.
R1, R3, R10,
R12, R13, R16,
R17, R18, C16,
C20, W1, W2
Q Channel Baseband Interface
. See the I Channel Baseband Interface section.
C11, C12
Baseband Low-Pass Filtering
. By adding Capacitor C11 between QFLP and QFLM, and C12
between IFLP and IFLM, the 3 dB low-pass corner frequency of the baseband interface can
be reduced from 230 MHz (nominal). See equation in text.
Output Interface
. The 1:1 balun transformer, T1, converts the 50 differential output to 50
single-ended. C17 and C18 are dc blocks. L1 and L2 provide dc bias for the output.
T1, C17, C18,
L1, L2
C17, C18 = 100 pF
(Size 0603)
T1 = ETC1-1-13 (M/A-COM)
L1, L2 = 120 nH
(Size 0603)
L3, L4 = 1.2 nH (Size 0402)
C5, C6 = 100 pF (Size 0603)
L3, L4, C5, C6
Input Interface
. The input impedance of the AD8341 requires 1.2 nH inductors in series
with RFIP and RFIM for optimum return loss when driven by a single-ended 50 line. C5
and C6 are dc blocks.
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