ADL5561

Rev. B | Page 18 of 24

LAYOUT CONSIDERATIONS

High-Q inductive drives and loads, as well as stray transmission

line capacitance in combination with package parasitics, can

potentially form a resonant circuit at high frequencies, resulting in

excessive gain peaking or possible oscillation. If RF transmission

lines connecting the input or output are used, designed them

such that stray capacitance at the input/output pins is minimized.

In many board designs, the signal trace widths should be

minimal where the driver/receiver is more than one-eighth of

the wavelength from the amplifier. This nontransmission line

configuration requires that underlying and adjacent ground and

low impedance planes be dropped from the signal lines

0.1µF

0.1µF

0.1µF

0.1µF

ADL5561

VIP2

VIP1

VIN1

VOP

VON

VIN2

R6

R5

R4

R3

R2

R1

R8

R7

R10

R9

ETC1-1-13

ETC1-1-13

SPECTRUM

ANALYZER

Figure 41. General-Purpose Characterization Circuit

Table 10. Gain Setting and Input Termination Components for Figure 41

R1 (Ω)

R2 (Ω)

R3 (Ω)

R4 (Ω)

R5 (Ω)

R6 (Ω)

6 dB

29

29

Open

0

0

Open

12 dB

33

33

0

Open

Open

0

15.5 dB

40.2

40.2

0

0

0

0

Table 11. Output Matching Network for Figure 41

R7 (Ω)

R8 (Ω)

R9 (Ω)

R10 (Ω)

200

84.5

84.5

34.8

34.8

1 k

487

487

25

25

ADL5561

VIP2

VIP1

VIN1

VOP

VON

VIN2

R6

R5

R4

R3

R2

R1

R8

R7

R10

R9

PORT 1

PORT 3

PORT 2

PORT 4

Figure 42. Differential Characterization Circuit Using Agilent E8357A 4-Port PNA

Table 12. Gain Setting and Input Termination Components for Figure 42

R1 (Ω)

R2 (Ω)

R3 (Ω)

R4 (Ω)

R5 (Ω)

R6 (Ω)

6

67

67

Open

0

0

Open

12

100

100

0

Open

Open

0

15.5

200

200

0

0

0

0

Table 13. Output Matching Network for Figure 42

R7 (Ω)

R8 (Ω)

R9 (Ω)

R10 (Ω)

200

50

50

Open

Open

1 k

475

475

61.9

61.9