5

T5744

4521B–RKE–01/03

Figure 5 shows a typical input matching network for f

433.92 MHz using a SAW. Figure 6 illustrates the input matching to 50

W without a

SAW. The input matching networks shown in Figure 6 are the reference networks for the

parameters given in the electrical characteristics.

Table 1. Calculation of LO and IF Frequency

Figure 5. Input Matching Network with SAW Filter

Conditions

Local Oscillator Frequency

Intermediate Frequency

f

f

f

f

f

f

300 MHz < f

365 MHz < f

f

LO

f

RF

1

1

314

---------

+

-------------------

=

f

IF

f

LO

314

---------

=

f

LO

f

RF

1

1

432.92

-----------------

+

---------------------------

=

f

IF

f

LO

432.92

-----------------

=

IN

IN_GND

OUT

OUT_GND

CASE_GND

B3555

T5744

C3

22p

L

25n

C16

100p

C17

8.2p

L3

TOKO LL2012

F27NJ

27n

C2

8.2p

L2

TOKO LL2012

F33NJ

33n

1

2

3,4 7,8

5

6

8

9

RF

IN

f

LNAGND

LNA_IN

IN

IN_GND

OUT

OUT_GND

CASE_GND

B3551

T5744

C3

47p

L

25n

C16

100p

C17

22p

L3

TOKO LL2012

F47NJ

47n

C2

10p

L2

TOKO LL2012

F82NJ

82n

1

2

3,4 7,8

5

6

8

9

f

LNAGND

LNA_IN

RF

IN