9

Preliminary Information

SL1925

Figure 13 Baseband output impedance, Iout and Qout (typical)

Marker

Freq (MHz)

Zreal

1

1

11.4

3.4

2

10

9.6

0.2

3

30

7.3

4.7

Figure 14 Example baseband interstage filter for 30MS/s application

0.5

1

0

+j0.2

+j0.5

+j1

+j2

+j5

2

5

–j5

–j2

–j1

–j0.5

–j0.2

STOP 50MHz

START 10kHz

X

X

X

X

1

2

3

Normalised to 50

Ω

OPFI / OPFQ

100nF

1k

Ω

1k

Ω

IPFI / IPFQ

3.9pF