Available on Tape
and Reel for Pick and
Place Manufacturing.
USA/Canada:
Toll Free:
Europe:
(315) 432-8909
(800) 411-6596
+44 2392-232392
Model X3DC21P1S
Rev D
PRELIMINARY
b
Electrical Specifications **
Features:
2100 - 2200 MHz
Low Amp Imbalance
Low Loss
Production Friendly
Tape and Reel
Lead Free
Frequency
Return
Loss [1]
Insertion
Loss [1]
Amplitude
Imbalance [1]
Phase
Imbalance
[1]
Operating
Temp.
MHz
dB Min
dB Max
dB Max
Degrees
ºC
2100 - 2200
22
0.20
±0.20
90± 3.0
-55 to +95
Return
Loss [2]
Insertion
Loss [2]
Port
Extension[3]
Power[4]
JC
dB Min
dB Max
Degrees
PA Max.
Watts
ºC/Watt
20
0.3
7
2 x 70
10.2
**Specification based on performance of unit properly installed on Anaren 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 7° at 2150MHz. Details in page 2.
[4] 70W output from each PA for short duration @ max power condition. Details in page 5.
Mechanical Outline
.250±.010
[6.35±0.25]
PIN 1 PIN 2
PIN 4 PIN 3
ORIENTATION
MARK DENOTES
PIN 1
DENOTES ARRAY
ROW (RR) AND COLUMN (CC)
.046±.005
[1.17±0.12]PIN 1
PIN 2
PIN 4
PIN 3
.020±.004
[0.51±0.10]
.020±.004
[0.51±0.10]
4X .034±.004 SQ
[0.86±0.10]
.170±.004
[4.32±0.10]
.120±.004
[3.05±0.10]
GND
Dimensions are in Inches [Millimeters]
X3DC21P1S Mechanical Outline
Tolerances are Non-cumulative
.200±.010
[5.08±0.25]
GND
USA/Canada:
Toll Free:
Europe:
(315) 432-8909
(800) 411-6596
+44 2392-232392
Available on Tape and
Reel for Pick and Place
Manufacturing.
Model X3DC21P1S
Rev D
Doherty Amplifier Configuration
Doherty Combiner Pin Configuration
The X3DC21P1S 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
Pin 2
Pin 3
Pin 4
Combining Port
Not Used
Peak Amp Port
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.
90°
°
Pin 2
Pin 4
50Ω
Pin 1
Pin 3
50Ω
35Ω
50Ω
90°
90°
Main Amp
Peak Amp
50Ω
35Ω
90°
RF input
NC
RF output
0°
90°
Offset line
Port Extension
Anaren Doherty
Combiner
50Ω
Available on Tape
and Reel for Pick and
Place Manufacturing.
USA/Canada:
Toll Free:
Europe:
(315) 432-8909
(800) 411-6596
+44 2392-232392
Model X3DC21P1S
Rev D
PRELIMINARY
Typical Performance (25°C): 2100-2200 MHz
2100 2110 2120 2130 2140 2150 2160 2170 2180 2190 2200
-50
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
Frequency (Mhz)
Return Loss(Max) (dB)
Return Loss for X3DC21P1S (Maximum Power Condition)
25ºC
2100 2110 2120 2130 2140 2150 2160 2170 2180 2190 2200
-50
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
Frequency (Mhz)
Return Loss(Low) (dB)
Return Loss for X3DC21P1S (Low Power Condition)
25ºC
2100 2110 2120 2130 2140 2150 2160 2170 2180 2190 2200
-0.2
-0.18
-0.16
-0.14
-0.12
-0.1
-0.08
-0.06
-0.04
-0.02
0
Frequency (Mhz)
Insertion Loss(Max) (dB)
Insertion Loss for X3DC21P1S (Maximum Power Condition)
25ºC
2100 2110 2120 2130 2140 2150 2160 2170 2180 2190 2200
-0.25
-0.2
-0.15
-0.1
-0.05
0
Frequency (Mhz)
Insertion Loss(Low) (dB)
Insertion Loss for X3DC21P1S (Low Power Condition)
25ºC
2100 2110 2120 2130 2140 2150 2160 2170 2180 2190 2200
-95
-94
-93
-92
-91
-90
-89
-88
-87
-86
-85
Frequency (Mhz)
Phase Balance (dB)
Phase Balance for X3DC21P1S (Maximum Power Condition)
25ºC
2100 2110 2120 2130 2140 2150 2160 2170 2180 2190 2200
-0.2
-0.15
-0.1
-0.05
0
0.05
0.1
0.15
0.2
Frequency (Mhz)
Amplitude Balance (dB)
Amplitude Balance for X3DC21P1S (Maximum Power Condition)
25ºC
USA/Canada:
Toll Free:
Europe:
(315) 432-8909
(800) 411-6596
+44 2392-232392
Available on Tape and
Reel for Pick and Place
Manufacturing.
Model X3DC21P1S
Rev D
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
Mathematical Representation
Return Loss
The impedance match at
the combining port to a
50 system.
20log
11
S
Insertion Loss
The combined power
divided by the sum of
input power under the
perfect combining
condition.
10log
2
14
2
13 SS
Phase Imbalance
The phase difference
between Peak-Combined
path and Main-Combined
path at
c
= 2150MHz
Phase
)(
14 c
S
– Phase
)(
13 c
S
Amplitude Imbalance
The magnitude difference
between Peak-Combined
path and Main-Combined
path.
2
S20logS20log 1314
Low power condition
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
Definition
Mathematical Representation
Return Loss
The impedance match of the 50 to100 Ω
transformer.
20log
44
S
Insertion Loss
The output power divided by input power.
20log
14
S
Available on Tape
and Reel for Pick and
Place Manufacturing.
USA/Canada:
Toll Free:
Europe:
(315) 432-8909
(800) 411-6596
+44 2392-232392
Model X3DC21P1S
Rev D
PRELIMINARY
Mounting Footprint
Doherty Power handling
Doherty power amplifiers are capable of amplifying the
signals of high Peak to Average Ratio (PAR) with high
efficiency. A 1:1 symmetrical Doherty architecture is
typically used for signals of 6-10dB PAR.
To evaluate power handling capability, the doherty
combiner is analyzed in different conditions of varying
PAR that the component would see in its lifetime.
Condition 1: In symmetrical Doherty application, at
average power condition, the Doherty amplifier works at
back off mode and turns on only main amplifier with half
of its full power capacity. The thermal condition of Anaren
Doherty combiner is evaluated as an impedance
transformer.
X3DC21P1S can handle reliably for life 35 watts at main
amplifier and 0 watts at peak amplifier when evaluated as
impedance transformer.
Condition 2: Doherty amplifier ramps up the main
amplifier to 65% its full power capacity and peak amplifier
to 30% of its full power capacity, outputting power
roughly 3dB above the average. The thermal condition of
Anaren Doherty combiner is analyzed as a coherent
combiner and such power level is assumed continuously
over entire life span of the component. Although
conservative and limit the components power rating, it is
done so to guarantee the life time of the components
over high PAR signals.
X3DC21P1S can handle reliably for life 46 watts at main
amplifier and 21 watts at peak amplifier when evaluated
for condition 2.
Condition 3: Signals of 3dB and above the average
power occur with low probability and short duration and
they do not present thermal risk. With high breakdown
voltage, Anaren Doherty combiners can safely withstand
at least 12dB peaks over the average rated power.
X3DC21P1S can handle reliably for life 70 watts at main
amplifier and 70 watts at peak amplifier when evaluated
for peak pulses of very short duration.
The power handlings of Anaren Doherty combiners are
conservatively rated at averaged power with high PAR
signal and Doherty operation in mind. The combiners
can be used in Doherty amplifiers of rated average output
power. No further power derating for high PAR signals is
required
To ensure proper electrical and thermal performance
there must be a ground plane with 100%
solder connection underneath the part orientated as
shown with text facing up.
Dimensions are in Inches [Millimeters]
X3DC21P1S Mounting Footprint
3X 50
Transmission
Line
.120
[3.05]
.170
[4.32]
.034
[0.86]
Multiple plated
thru holes to
ground
CC
RR
P1S
X3DC21
USA/Canada:
Toll Free:
Europe:
(315) 432-8909
(800) 411-6596
+44 2392-232392
Available on Tape and
Reel for Pick and Place
Manufacturing.
Model X3DC21P1S
Rev D
Direction Of
Part Feed
(Unloading)
.079
[2.00]
.157
[4.00]
.069
[1.75]
.217
[5.50] .472
[12.00]
.315
[8.00]
TYP Ø.059
[Ø1.50]
.264
[6.70]
.217
[5.50]
.012
[0.30]
.079
[2.00]
Dimensions are in Inches [Millimeters]
Packaging and Ordering Information
Parts are available in reel. Packaging follows EIA 481-D. Parts are oriented in tape and reel as shown below.
Minimum order quantities are 2000 per reel