X3DC21E2S
Rev E
Doherty Combiner
Description:
The X3DC21E2S is a low profile, high performance Doherty
Combiner in a new easy to use, manufacturing friendly surface
mount package. The X3DC21E2S is designed particularly for
Doherty Amplifier applications, where tightly controlled phase and
amplitude imbalance as well as low insertion loss are required for
maximum and low power condition. It can be used in high power
applications up to 200 watts.
Parts have been subjected to rigorous qualification testing and
they are manufactured using materials with coefficients of thermal
expansion (CTE) compatible with common substrates such as
FR4, G-10, RF-35, RO4350 and polyimide. Produced with 6 of 6
RoHS compliant tin immersion finish.
Electrical Specifications **
Features:
•
•
•
•
•
•
•
2110-2170 MHz
High Power
Low Amp Imbalance
Very Low Loss
Production Friendly
Tape and Reel
Lead Free
Mechanical Outline:
Frequency
Return
Loss [1]
Insertion
Loss [1]
Amplitude
Imbalance
[1]
Phase
Imbalance
[1]
MHz
dB Min
dB Max
dB Max
Degrees
2110 – 2170
20
0.15
±0.12
90 ± 3.0
Return
Loss [2]
Insertion
Loss [2]
Port
Extension[3]
Power[4]
Operating
Temp.
dB Min
dB Max
Degrees
Avg. CW
Watts@95°C
ºC
20
0.20
8
200
-55 to +150
**Specification based on performance of unit properly installed on TTM Test Board
[1] At maximum power condition, Doherty combiner functions as an equal-split power combiner.
[2] At low power condition, Doherty combiner functions as a 100Ω to 50Ω impedance transformer.
[3] There are short 50 ohm lines associated with input ports of 8° at 2140MHz. Details in page 2.
[4] Average power handling which represents low power mode.
1
X3DC21E2S
Rev E
Doherty Amplifier Configuration
Doherty Combiner Pin Configuration
The X3DC21E2S has an orientation marker to denote Pin 1. Once port one has been identified the other
ports are known automatically. Please see the chart below for clarification:
Pin 1
Combining Port
Pin 2
Not Used
Pin 3
Peak Amp Port
Pin 4
Main Amp Port
There are inevitably short lines associating with input ports in some high frequency band parts. The length of
the short line is specified as electrical length at center frequency and noted as port extension in this
datasheet. The designer should take this length into the consideration to optimize the offset line length.
2
X3DC21E2S
Rev E
Insertion Loss and Power Derating Curves:
Insertion Loss Derating:
Power Derating:
The insertion loss, at a given frequency, of a group of
doherty combiners is measured at 25°C and then
averaged. The measurements are performed under
small signal conditions (i.e. using a Vector Network
Analyzer). The process is repeated at 95°C and 150°C.
A best-fit line for the measured data is computed and
then plotted from -55°C to 150°C.
The power handling and corresponding power derating
plots are a function of the thermal resistance, mounting
surface temperature (base plate temperature), maximum
continuous operating temperature of the Doherty
combiner, and the thermal insertion loss. The thermal
insertion loss is defined in the Power Handling section of
the data sheet.
As the mounting interface temperature approaches the
maximum continuous operating temperature, the power
handling decreases to zero.
If mounting temperature is greater than 95°C, Xinger
doherty combiner will perform reliably as long as the input
power is derated to the curve above.
3
X3DC21E2S
Rev E
Typical Performance (25°C): 2100-2180 MHz
0
Return Loss for X3DC21E2 (Maximum Power Condition)
25ºC
-10
-10
-15
-15
-20
-25
-30
-35
-25
-30
-35
-40
-45
-45
0
2110
2120
2130
2140
2150
Frequency (Mhz)
2160
2170
-50
2100
2180
Insertion Loss for X3DC21E2 (Maximum Power Condition)
2110
2120
2130
2140
2150
Frequency (Mhz)
2160
2170
2180
Insertion Loss for X3DC21E2 (Low Power Condition)
0
25ºC
25ºC
-0.02
-0.05
-0.04
-0.06
Insertion Loss(Low) (dB)
Insertion Loss(Max) (dB)
-20
-40
-50
2100
25ºC
-5
Return Loss(Low) (dB)
Return Loss(Max) (dB)
-5
Return Loss for X3DC21E2 (Low Power Condition)
0
-0.08
-0.1
-0.12
-0.14
-0.16
-0.1
-0.15
-0.2
-0.25
-0.18
-0.2
2100
-85
2110
2120
2130
2140
2150
Frequency (Mhz)
2160
2170
2100
2180
Phase Balance for X3DC21E2 (Maximum Power Condition)
0.2
2130
2140
2150
Frequency (Mhz)
2160
2170
2180
Amplitude Balance for X3DC21E2 (Maximum Power Condition)
25ºC
0.15
-87
0.1
Amplitude Balance (dB)
-88
Phase Balance (dB)
2120
25ºC
-86
-89
-90
-91
-92
0.05
0
-0.05
-0.1
-93
-0.15
-94
-95
2100
2110
2110
2120
2150
2130
2140
Frequency (Mhz)
2160
2170
2180
-0.2
2100
2110
2120
2130
2140
2150
Frequency (Mhz)
2160
2170
2180
4
X3DC21E2S
Rev E
Definition of the Specifications
To guarantee the part performance in Doherty architecture, the part is specified in Doherty operation for
maximum power condition and low power condition. The following specification definition assumes the extra
port extension is already applied to the raw S parameter and the parts is measured with Pin n connected to
Port n (where n=1, 2, 3, 4).
Maximum power condition
Under the maximum power condition, the symmetrical Doherty architecture requires main amplifier and peak
amplifier to work at full capacity with the optimum termination (50 Ω). The two amplifiers should deliver RF
power of equal magnitude and 90 degree phase difference. Doherty combiner functions as a coherent power
combiner and supplies the 90 degree phase compensation. The following specification is defined with 50 Ω
port impedance at three ports for this condition. The return loss and the insertion loss in max power mode
are not affected by the 50 ohm lossless port rotation mentioned in electrical spec table in page 1. The phase
imbalance and the amplitude imbalance are not affected either since port rotation are taken off equally from
the main and the peak amp port.
Parameter
Definition
Return Loss
The impedance match at the combining
port to a 50Ω system.
Insertion Loss
The combined power divided by the sum
of input power under the perfect
combining condition.
Phase Imbalance
Amplitude Imbalance
The phase difference between PeakCombined path and Main-Combined path
at ωc = 2140MHz.
The magnitude difference between PeakCombined path and Main-Combined path.
Low power condition
Mathematical Representation
20log| S11 |
10log(|S13 |2 + |S14 |2 )
Phase (S14 (ωc ))
− Phase (S13 (ωc ))
1
(20log| S14 | − 20log| S13 |)
2
Under low power condition, the Doherty operation turns off peak amplifier and requires main amplifier to be
terminated with double of the optimum impedance (100 Ω). In this configuration, Doherty combiner servers
as an impedance transformer transforming 50 Ω at combining port to 100 Ω at main amplifier port. The
following specification is defined under the port impedance condition of Port 1 (Combining Port) 50 Ω, Port 4
(Main Amp Port) 100 Ω and Port 3 (Peak Amp Port) open. With the peak amp left off, the extra line length in
that port (see figure in page 2) acts as an open stub which shifts the low power mode return loss null and
insertion loss. The offset line length needs to be adjusted taking the port rotation number into consideration
so that the junction of 50 Ω and 35 Ω transmission line sees high impedance instead of the part edge. The
return loss and the insertion loss defined below are after the offset line adjustments specified in the spec
table.
Parameter
Return Loss
Insertion Loss
Definition
The impedance match of the 50 to100 Ω
transformer.
Mathematical Representation
The output power divided by input power.
20log| S41 |
20log| S11 |
5
X3DC21E2S
Rev E
Packaging and Ordering Information
Parts are available in reel. Packaging follows EIA 481-2. Parts are oriented in tape and reel as shown
below. Minimum order quantities are 2000 per reel.
.079
[2.00]
Ø.059
[Ø1.50]
.157
[4.00]
.012
[0.30]
.069
[1.75]
.453
[11.50]
.591
[15.00]
Ø.059
[Ø1.50]
.228
[5.80]
.315
[8.00]
XX XX
.094
[2.40]
.945
[24.00]
Contact us:
rf&s_support@ttm.com
6
很抱歉,暂时无法提供与“X3DC21E2S”相匹配的价格&库存,您可以联系我们找货
免费人工找货