CN-0205

Circuit Note

Rev. 0 | Page 4 of 9

–6.0

–5.0

–4.0

–3.0

–2.0

–1.0

0

1.0

1M

10M

100M

1G

BB FREQUENCY (Hz)

Figure 6. Baseband (BB) Frequency Response of ADL5375-05

RBIP

50Ω

RBIN

50Ω

67

66

C1I

3.6pF

C2PI

22pF

C4PI

3pF

C2NI

22pF

C4NI

3pF

L1PI

33nH

L2PI

33nH

IBBN

IBBP

AD9122

ADL5375-05

RBQN

50Ω

RBQP

50Ω

59

58

RSLI

100Ω

RSLQ

100Ω

IOUT1N

IOUT1P

IOUT2P

IOUT2N

QBBP

QBBN

L1NI

33nH

L2NI

33nH

C3I

6pF

C1Q

3.6pF

C2NQ

22pF

C4NQ

3pF

C2PQ

22pF

C4PQ

3pF

L1NQ

33nH

L2NQ

33nH

L1PQ

33nH

L2PQ

33nH

C3Q

6pF

21

22

9

10

Figure 7. Recommended DAC Modulator Interface topology with Fc =300

MHz Fifth-Order, Butterworth Filter

0

–5

–10

–15

–20

–25

1

10

100

500

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0

FREQUENCY (MHz)

MAGNITUDE

GROUP DELAY

Figure 8 . Frequency Response for DAC Modulator Interface with 300 MHz

Fifth-Order Butterworth Filter (Simulated)

–40

–30

–20

–10

0

0

100

200

300

400

500

FREQUENCY (MHz)

Figure 9. Measured Frequency Response for DAC Modulator Interface with

300 MHz Fifth-Order Butterworth Filter

–120

–110

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

0

300

400

500

600

700

800

900

1000

COMMON MODE FREQUENCY (MHz)

NO FILTER

WITH FILTER

Figure10. Measured Common-Mode Rejection Performance at ADL5375-05

RF output with Filter and without Filter