cv111-3 ETC-unknow, cv111-3 Datasheet - Page 2

• Manufacturer Part Number: cv111-3
• Description: Umts-band High Linearity Downconverter
• Manufacturer: ETC-unknow

RF OUT
MIXRF
CV111-3: 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 (C12) for optimal gain and input return loss
performance.
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.
component values for other IF center frequencies can be provided by
emailing to [e-mail].
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
WJ Communications, Inc x Phone 1-800-WJ1-4401 x FAX: [phone] x e-mail: [e-mail] x Web site: www.wj.com
GND
GND
GND
RF Bandpass Filter /
N/C
N/C
Attenuator Pad
1
2
3
4
5
6
7
RF
RF Amp
28
8
(used for cellular versions only)
RF Amp Bias
27
9
CV111-3
UMTS-band High Linearity Downconverter
RF / IF Diplexer
26
10
The IF amplifier requires matching elements to
25
11
LO
IF
24
12
LO Driver Amp
Device Architecture / Application Circuit Information
(not used in this product)
23
13
IF Amp
RF Amp Matching
LO Lowpass Filter
22
14
Bandpass filtering is recommended to
21
20
19
18
17
16
15
IF OUT
GND
N/C
GND
BIAS
GND
LO IN
The RF amplifier requires a
LO Amp / MMIC Mixer
IF Amp Matching
RF Amplifier
IF Amplifier
CV111-1
RF Filter
Stage
LO Amp Bias
IF Amp Bias
LO Amp Bias
Proper
Typical Downconverter Performance Chain Analysis
Gain
(dB)
13
19
-2
-9
Cumulative Performance
Lowpass Filter
Optional IF
Output
(dBm)
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.
CV111-3; therefore the components shown in the diplexer section
should be loaded as follows: C2 = C14 = 0 :.
IF and LO Lowpass Filtering (optional):
RF and LO signals are typically performed in the IF chain. This
filtering function may be realized using lumped elements;
placeholders (L9, C21, C22) are provided in the application circuit
to allow for lumped-element filtering to be implemented if desired.
The LO lowpass filter is used only in the cellular-band CV products;
it should not be used for this product. L1 should be loaded with a 0
: jumper.
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.
P1dB
21
---
23
9
Output
(dBm)
IP3
23
41
---
41
The mixer performs the diplexing internally for the
DC bias must be provided for the RF, LO and IF
The Communications Edge
(dB)
NF
3.2
9.8
2.1
Specifications and information are subject to change without notice
2.0
Printed Circuit Board Material:
.014” FR-4, 4 layers, .062” total thickness
This is only used with the cellular-band CV
Current
(mA)
140
100
140
380
---
Gain
(dB)
13
11
21
21
2
Product Information
Cumulative Performance
Output
(dBm)
P1dB
21.0
19.0
21.0
21.0
6.5
Filtering of unwanted
Page 2 of 4 April 2005
Output
(dBm)
22.2
38.1
41.0
39.0
38.1
IP3
TM
(dB)
NF
3.2
3.3
4.5
5.3
5.3