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參數(shù)資料
| 型號(hào)： | CV221-2AF |
| 英文描述： | 1.9 - 2.7 GHz Dual-Branch Downconverter |
| 中文描述： | 1月9日至2月7日GHz雙科變頻器 |
| 文件頁(yè)數(shù)： | 2/5頁(yè) |
| 文件大小： | 335K |
| 代理商： | CV221-2AF |
Specifications and information are subject to change without notice
WJ Communications, Inc
Phone 1-800-WJ1-4401
FAX: 408-577-6621
e-mail: sales@wj.com
Web site: www.wj.com
Page 2 of 5 June 2007
CV221-2A
1.9 – 2.7 GHz Dual-Branch Downconverter
Device Architecture / Application Circuit Information
Typical 2.1 GHz Downconverter Performance Chain Analysis (Each Branch)
Cumulative Performance
Input
P1dB
(dBm)
-8.4
20
9.2
9
9.2
9
Stage
Gain
(dB)
Input
P1dB
(dBm)
Input
IP3
(dBm)
NF
(dB)
Current
(mA)
Gain
(dB)
Input
IP3
(dBm)
33
27.8
27.8
NF
(dB)
LO Amp / MMIC Mixer
IF Amplifier
CV221-2A
-8.4
17.6
20
1
33
21
9
2.2
115
100
315*
9
11
11
Cumulative Performance
* The 2
nd
branch includes another mixer and IF amplifier, which increases the total current consumption
of the MCM to be 315 mA.
CV221-2A
: The application circuit can be broken up into three main
functions as denoted in the colored dotted areas above: RF/IF diplexing
(blue), IF amplifier matching (green), and dc biasing (purple). There are
various placeholders for chip components in the circuit schematic so that
a common PCB can be used for all WJ dual-branch converters.
External Diplexer:
This is only used with the cellular-band CV
products. The mixer performs the diplexing internally for the
CV221-2A; therefore the components shown in the diplexer section
should be not be loaded except for L3, L10, L7, and L11, which
should contain a 0
Ω
jumper.
IF Amplifier Matching:
The IF amplifier requires matching
elements to optimize the performance of the amplifier to the desired
IF center frequency. Since IF bandwidths are typically on the order
of 5 to 10%, a simple two element matching network, in the form of
either a high-pass or low-pass filter structure, is sufficient to match
the MMIC IF amplifier over these narrow bandwidths. Proper
component values for other IF center frequencies can be provided by
emailing to applications.engineering@wj.com.
DC Biasing:
DC bias must be provided for the LO and IF amplifiers
in the converter. R1 sets the operating current for the last stage of the
LO amplifier and is chosen to optimize the mixer LO drive level.
Proper RF chokes and bypass capacitors are chosen for proper
amplifier biasing at the intended frequency of operation. The “+5 V”
dc bias should be supplied directly from a voltage regulator.
WiMax Operation:
There is no change to the application circuit for
operation in the 2.5 to 2.7 GHz band.
Printed Circuit Board Material:
.014” FR-4, 4 layers, .062” total thickness
1
2
3
4
5
6
7
21
20
19
18
17
16
15
28
27
26
25
24
23
22
8
9
10
G
11
A
12
13
I
14
IF Amp 2
IF Amp 1
LO Driver Amp
BIAS
GND
N/C
GND
LO
GND
N/C
RF 1
INPUT
GND
BIAS
GND
N/C
GND
G
M
I
G
A
I
G
G
G
M
I
G
G
IF
I
I
O
O
IF
RF
RF
RF 2
INPUT
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