cv111-3a WJ Communications, Inc., cv111-3a Datasheet - Page 2

• Manufacturer Part Number: cv111-3a
• Description: Umts-band High Linearity Downconverter
• Manufacturer: WJ Communications, Inc.

RF OUT
MIXRF
CV111-3A: The application circuit can be broken up into four main
functions as denoted in the colored dotted areas above: RF/IF
diplexing (purple; this is only used with the cellular-band CV
products), 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:
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
[e-mail].
WJ Communications, Inc • Phone 1-800-WJ1-4401 • FAX: [phone] • e-mail: [e-mail] • Web site: www.wj.com, www.TriQuint.com
GND
GND
GND
N/C
N/C
1
2
3
4
5
6
7
RF
RF Amp
28
8
RF Bandpass Filter /
27
9
Attenuator Pad
CV111-3A
UMTS-band High Linearity Downconverter
26
10
25
11
(used for cellular versions only)
LO
IF
24
12
LO Driver Amp
Device Architecture / Application Circuit Information
RF / IF Diplexer
RF Amp Bias
23
13
Frequency (MHz)
IF Amp
22
14
R8 (ohms)
C17 (pF)
L7 (nH)
L4 (nH)
21
20
19
18
17
16
15
The RF amplifier requires a shunt
IF OUT
GND
N/C
GND
BIAS
GND
LO IN
RF Amp Matching
LO Amp / MMIC Mixer
RF Amplifier
IF Amplifier
470
470
4.7
CV111-3A
40
24
RF Filter
Stage
IF Amp Matching
430
240
4.7
50
15
IF Amplifier Matching
LO Amp Bias
150
330
3.3
75
22
Typical Downconverter Performance Chain Analysis
IF Amp Bias
Gain
(dB)
18.5
-8.5
12
-2
LO Amp Bias
100
150
330
Cumulative Performance
2.2
10
Output
RF Bandpass Filtering:
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.
External Diplexer:
products.
CV111-3A; therefore the components shown in the diplexer section
should be loaded as follows: C2 = C14 = 0 Ω.
DC biasing:
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.
(dBm)
P1dB
21
---
23
8
125
120
330
8.2
2.2
Output
(dBm)
130
120
330
6.8
2.2
IP3
41
---
23
41
The mixer performs the diplexing internally for the
Printed Circuit Board Material:
.014” FR-4, 4 layers, .062” total thickness
DC bias must be provided for the RF, LO and IF
155
100
330
5.6
2.2
(dB)
Specifications and information are subject to change without notice
NF
3.5
2.0
9.1
2.1
This is only used with the cellular-band CV
180
330
4.7
2.2
82
Current
(mA)
140
140
360
Bandpass filtering is recommended to
80
---
210
220
3.3
2.2
82
Gain
(dB)
1.5
12
10
20
20
240
220
3.9
2.2
Cumulative Performance
56
Output
(dBm)
P1dB
21.0
19.0
20.7
20.7
6.1
Page 2 of 5 April 2007
Output
(dBm)
41.0
39.0
22.2
37.9
37.9
IP3
(dB)
NF
4.8
5.4
3.5
3.6
5.4