CV221-2A_07 WJCI [WJ Communication. Inc.], CV221-2A_07 Datasheet - Page 2

• Manufacturer Part Number: CV221-2A_07
• Description: 1.9 - 2.7 GHz Dual-Branch Downconverter
• Manufacturer: WJCI [WJ Communication. Inc.]

INPUT
INPUT
GND
BIAS
GND
GND
RF 1
RF 2
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:
products.
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:
elements to optimize the performance of the amplifier to the desired
IF center frequency. Since IF bandwidths are typically on the order
WJ Communications, Inc • Phone 1-800-WJ1-4401 • FAX: [phone] • e-mail: [e-mail] • Web site: www.wj.com
N/C
1
2
3
4
5
6
7
RF
RF
28
8
27
9
IF
IF
The mixer performs the diplexing internally for the
CV221-2A
1.9 – 2.7 GHz Dual-Branch Downconverter
26
10
25
11
IF Amp 1
IF Amp 2
LO Driver Amp
24
12
This is only used with the cellular-band CV
Device Architecture / Application Circuit Information
23
13
22
14
The IF amplifier requires matching
21
20
19
18
17
16
15
BIAS
GND
N/C
GND
LO
GND
N/C
LO Amp / MMIC Mixer
* The 2
IF Amplifier
of the MCM to be 315 mA.
CV221-2A
Stage
Typical 2.1 GHz Downconverter Performance Chain Analysis (Each Branch)
nd
branch includes another mixer and IF amplifier, which increases the total current consumption
Gain
(dB)
17.6
-8.4
Cumulative Performance
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.
component values for other IF center frequencies can be provided by
emailing to [e-mail].
DC Biasing:
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:
operation in the 2.5 to 2.7 GHz band.
(dBm)
Input
P1dB
20
1
Printed Circuit Board Material:
.014” FR-4, 4 layers, .062” total thickness
(dBm)
Input
IP3
33
21
DC bias must be provided for the LO and IF amplifiers
(dB)
Specifications and information are subject to change without notice
NF
2.2
9
There is no change to the application circuit for
Current
(mA)
315*
115
100
Gain
(dB)
-8.4
9.2
9.2
Cumulative Performance
(dBm)
Input
P1dB
20
9
9
Page 2 of 5 June 2007
(dBm)
Input
27.8
27.8
IP3
33
Proper
(dB)
NF
11
11
9