CV110-1A 데이터 시트보기 (PDF) - WJ Communications => Triquint
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CV110-1A Datasheet PDF : 4 Pages
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CV110-1A
Cellular-band High Linearity Downconverter
Device Architecture / Application Circuit Information
RF OUT 1
28 27 26 25 24 23 22
21 IF OUT
GND 2 RF Amp
IF Amp 20 GND
N/C 3
GND 4
IF THRU 5
IF Feedthru
Path
19 N/C
18 GND
LO Driver Amp
17 BIAS
GND 6
16 GND
RF/IF
RF/IF 7
15 LO IN
LO
8 9 10 11 12 13 14
Stage
RF Amplifier
RF Filter
MMIC Mixer
IF Amplifier
CV110-1A
Typical Downconverter Performance Chain Analysis
Gain
(dB)
Output
P1dB
(dBm)
Output
IP3
(dBm)
NF
(dB)
Current
(mA)
Cumulative Performance
Gain
(dB)
Output
P1dB
(dBm)
Output
IP3
(dBm)
NF
(dB)
13.5 21
40.0 3.5
150 13.5 21.0
40.0 3.5
-1.5
---
---
1.5
---
12.0 19.5
38.5 3.5
-9.0
8
23.0 9.8
60
3.0
6.1
22.1 4.5
19.0 22
39.1 2.5
150 22.0 20.3
37.0 5.0
Cumulative Performance
360 22.0 20.3
37.0 5.0
RF Amp Matching IF Amp Matching IF Amp Bias
RF Amp Bias
RF Bandpass Filter /
Attenuator Pad
Printed Circuit Board Material:
.014” FR-4, 4 layers, .062” total thickness
LO Amp Bias
RF / IF Diplexer
(used for cellular versions only)
LO Amp Bias
CV110-1A: The application circuit can be broken up into four main
functions as denoted in the colored dotted areas above: RF/IF diplexing
(purple), amplifier matching (green), filtering (red), and dc biasing
(blue). There are various placeholders for chip components in the circuit
schematic so that a common PCB can be used for all WJ single-branch
converters. Additional placeholders for other optional functions such as
filtering are also included.
RF / IF Amplifier Matching: The RF amplifier requires a shunt
matching element for optimal gain and input return loss performance.
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.
RF Bandpass Filtering: Bandpass filtering is recommended to reject
the image frequencies and achieve the best noise figure performance
with the downconverter. The bandpass filter, implemented with a SAW
filter on the application circuit, allows for the suppression of noise from
the image frequency. It is permissible to not use a filter and use a 2 dB
pad with R6, R7, and R16 instead with slightly degraded noise figure
performance. Standard WJ evaluation boards will have the 2 dB pad in
place.
External Diplexer: In a downconversion application, the incoming RF
signal impinges on the switching elements of the mixer; the interaction
with these switches produces a signal at the IF frequency. The two
signals (RF and IF) are directed to the appropriate ports by the external
diplexer. A four-element diplexer is used in the circuit implementation
(L8 and C2 are not used). Pin 5 contains the IF signal and allows the
signal to be transferred to pin 25 for the convenience of PCB layouts.
DC biasing: DC bias must be provided for the RF, 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.
IF Amplifier Matching
Frequency (MHz) 40 50 75 100 125 130
L7 (nH)
470 430 150 150 120 120
C17 (pF)
24 15 22 10 8.2 6.8
R8 (ohms)
4.7 4.7 3.3 2.2 2.2 2.2
L4 (nH)
470 240 330 330 330 330
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 4 April 2007
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