ULTRA-BROADBAND ISOLATION BALUN
(300 kHz to 50 GHz)
BAL-0050
Features
 300 kHz to 50 GHz Balun (Balanced to Unbalanced Transformer)
 1:2 Transformer (50 Ω unbalanced, 100 Ω differential/50 Ω balanced port)
 Applications: Analog to Digital Converters, Balanced Receivers,
Baseband Digital Modulation, Signal Integrity
 Termination insensitive: Particularly suited to testing poorly matched or
non 50 Ω devices or for extending 2 port VNAs for differential testing
 BAL-0050.s3p
Electrical Specifications - Specifications guaranteed from -55 to +100°C, measured in a 50Ω system.
Parameter
Frequency Range
Insertion Loss (dB)
Typ
Max
300 kHz to 35 GHz
6
9
35 to 50 GHz
10
1 to 50 GHz
25
Isolation (dB)
Min
Nominal Phase Shift (Degrees)
180
Amplitude Balance (dB)
±0.7
±1.4
±4
±10
Phase Balance (Degrees)
Common Mode Rejection (dB)
20
28
VSWR (Common)
1.5
300 kHz to 50 GHz
VSWR (Output)
1.6
Group Delay (ps)
520
RMS Group Delay Ripple (ps)
Risetime /Falltime (ps)
8
1
5
Total Input Power (W)
1
Weight (g)
125
Specified as 80%/20%. Calculated from balun2 = (out2 – in2)
1
Model Number
Description
BAL-0050
300 kHz to 50 GHz Balun with 2.40 mm connectors1
1
Default is 2.40 mm female connectors. Consult factory for other connector options.
.700
3.600
PROJECTION
[91.44]
XXX=±.005
XX=±.02
INCH
[MM]
.500
1.000
1.400
[12.7]
[25.4]
[35.56]
.075
[17.78]
.350
[1.91]
[8.89]
.275
.625
.625
DATA (180°)
[15.88]
INPUT
1.100
BAL0050
Ultra-Broadband Balun
(300 kHz to 50 GHz)
[6.98]
[15.88]
[27.94]
.700
1.250
[17.78]
[31.75]
DATA (0°)
D/C
.43
Ø.100 Thru, 5 PL
[10.92]
2.4 mm Connectors, 3 PL
215 Vineyard Court, Morgan Hill, CA 95037 | Ph: 408.778.4200 | Fax 408.778.4300 | info@markimicrowave.com
09/13/16
ULTRA-BROADBAND ISOLATION BALUN
(300 kHz to 50 GHz)
BAL-0050
Page 2
Block Diagram
180°
180°
0°
0°
Single ended to differential
Differential to single ended
Typical Performance
0
0
Common
-9
-12
-15
-18
Output 2
-10
-15
-20
Output 1
-21
Output 2
-25
-24
0
5
10
15
20
25
30
35
40
45
50
0
55
5
10
15
20
25
30
35
40
45
50
55
Frequency (GHz)
Frequency (GHz)
Fig. 2. Return loss for common port and output ports.
Fig. 1. Common to output port insertion loss.
5
200
4
195
3
Phase Balance (degree)
Amplitude Balance (dB)
Output 1
-5
-6
Return Loss (dB)
Insertion Loss (dB)
-3
2
1
0
-1
-2
-3
190
185
180
175
170
165
-4
160
-5
0
5
10
15
20
25
30
35
40
45
50
55
Frequency (GHz)
Fig. 3. Amplitude balance between output ports.
0
5
10
15
20
25
30
35
40
45
50
55
Frequency (GHz)
Fig. 4. Phase balance between output ports.
215 Vineyard Court, Morgan Hill, CA 95037 | Ph: 408.778.4200 | Fax 408.778.4300 | info@markimicrowave.com
09/13/16
ULTRA-BROADBAND ISOLATION BALUN
(300 kHz to 50 GHz)
BAL-0050
0
0
-5
-5
-10
-10
-15
Isolation (dB)
Common Mode Rejection (dB)
Page 3
-20
-25
-30
-15
-20
-25
-35
-30
-40
-35
-45
-40
0
5
10
15
20
25
30
35
40
45
50
55
0
5
10
15
Frequency (GHz)
25
30
35
40
45
50
55
50
55
Frequency (GHz)
Fig. 5. Common mode rejection.
Fig. 6. Output to output port isolation.
660
120
620
90
Differential Group Delay (ps)
Group Delay (ps)
20
580
540
500
460
420
380
60
30
0
-30
-60
-90
-120
0
5
10
15
20
25
30
35
40
45
50
55
0
Frequency (GHz)
10
15
20
25
30
35
40
45
Frequency (GHz)
Fig. 7. Group delay.
INPUT EYE
5
Fig. 8. Differential group delay.
DATA
INVERTED DATA
50 Gb/s
Fig. 9. Oscilloscope measurements of the BAL-0050 with a 50 Gb/s PRBS pattern in single ended-todifferential mode. Eye diagrams are taken with a 231-1 PRBS input demonstrating minimal eye distortion/closure
afforded by the extremely low frequency operation of the balun (<300 kHz).
215 Vineyard Court, Morgan Hill, CA 95037 | Ph: 408.778.4200 | Fax 408.778.4300 | info@markimicrowave.com
09/13/16
ULTRA-BROADBAND ISOLATION BALUN
(300 kHz to 50 GHz)
BAL-0050
Page 4
OUTPUT SINGLE ENDED
NEGATIVE INPUT
POSITIVE INPUT
40 Gb/s
POSITIVE OUTPUT
INPUT SINGLE ENDED
NEGATIVE OUTPUT
Fig. 10. Oscilloscope measurements of the BAL-0050 with a 40 Gb/s PRBS pattern. Bit pattern is measured
with a 27-1 PRBS input demonstrating extremely good pulse fidelity for both differential-to-single ended and
single ended to differential mode conversions.
DC Interface
Port
Description
Common
(Unbalanced
Port)
The common port is DC connected to the 0o port through a
resistor and to ground through a resistor.
0o Port
(Balanced)
The 0o port is DC connected to the common port through a
resistor and to ground through a resistor.
180o Port
(Balanced)
The 180o port is DC shorted to ground.
DC Interface Schematic
Marki Microwave reserves the right to make changes to the product(s) or information contained herein without notice. Marki Microwave makes no
warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Marki Microwave assume any liability
whatsoever arising out of the use of or application of any product.
215 Vineyard Court, Morgan Hill, CA 95037 | Ph: 408.778.4200 | Fax 408.778.4300 | info@markimicrowave.com
09/13/16