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Model B0011E75300A00

Rev B

Typical Performance with One External 82pF Capacitor

Port_1

ZO=75Ω [=Zin]

Port_2

ZO=150Ω [=Zout/2]

Port_3

ZO=150Ω [=Zout/2]

3

1

12

6

11

4

5

6

3

21

R1

R=300Ω [Zout]

4

7

9

5

10

B0011E75300Axx

C1

C=82pF

Figure 2 The Balun with an external capacitor on the

low impedance ground pin. This improves insertion loss

and return loss in the 40-200MHz range over that of the

basic configuration. The capacitor value can be changed

some to get a slightly different performance. A series

capacitor with just pin 4 does NOT produce identical

results as the one just in series with pin 7.

Frequency (MHz)

-3.6

-3.3

-3

-2.7

-2.4

-2.1

-1.8

-1.5

-1.2

-0.9

-0.6

-0.3

0

Frequency (MHz)

100

1000

82pF series capacitor on Pin 7

Insertion Loss

-1.661

-1.232

-0.497

-0.962

-1.308

Frequency (MHz)

-2

-1.6

-1.2

-0.8

-0.4

0

0.4

0.8

1.2

1.6

2

Frequency (MHz)

100

1000

82pF series capacitor on Pin 7

Amplitude Balance

0.587

0.283

-0.015

-0.283

-0.614

Frequency (MHz)

-36

-33

-30

-27

-24

-21

-18

-15

-12

-9

-6

-3

0

Frequency (MHz)

100

1000

82pF series capacitor on Pin 7

Return Loss

-10.999

-11.577

-18.631

-14.678

-12.417

Frequency (MHz)

-20

-16

-12

-8

-4

0

4

8

12

16

20

Frequency (MHz)

100

1000

82pF series capacitor on Pin 7

Phase Balance (Delta 180)

1.9962.147

2.108

3.206

6.305

Frequency (MHz)

-36

-33

-30

-27

-24

-21

-18

-15

-12

-9

-6

-3

0

Frequency (MHz)

100

1000

82pF series capacitor on Pin 7

Common Mode Rejection

-28.399

-32.098

-34.696

-29.797

-23.683