CV221-2A_07 Datasheet, PDF (2/5 Pages) WJ Communication. Inc. – 1.9 - 2.7 GHz Dual-Branch Downconverter

CV221-2A
1.9 – 2.7 GHz Dual-Branch Downconverter
Device Architecture / Application Circuit Information
28 27 26 25 24 23 22
RF 1
INPUT
1
RF
IF
21 BIAS
GND 2
IF Amp 1
20 GND
BIAS 3
19 N/C
GND 4
18 GND
N/C 5
LO Driver Amp 17 ^LO
GND 6
RF 2 ₇
INPUT RF
8
IF Amp 2
16 GND
IF
15 N/C
9 10 11 12 13 14
Typical 2.1 GHz Downconverter Performance Chain Analysis (Each Branch)
Stage
Gain
(dB)
Input
P1dB
(dBm)
Input
IP3
(dBm)
Cumulative Performance
NF
(dB)
Current
(mA)
Gain
(dB)
Input
P1dB
(dBm)
Input
IP3
(dBm)
NF
(dB)
LO Amp / MMIC Mixer -8.4
20
33
9
115
-8.4
20
33
9
IF Amplifier
17.6
1
21
2.2
100
9.2
9
27.8 11
CV221-2A
Cumulative Performance
315* 9.2
9
27.8 11
* The 2^nd branch includes another mixer and IF amplifier, which increases the total current consumption
of the MCM to be 315 mA.
Printed Circuit Board Material:
.014” FR-4, 4 layers, .062” total thickness
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.
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 [e-mail].
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
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.
Specifications and information are subject to change without notice
WJ Communications, Inc • Phone 1-800-WJ1-4401 • FAX: [phone] • e-mail: [e-mail] • Web site: www.wj.com
Page 2 of 5 June 2007