[AK1222]

MS1314-E-02

2014/10

- 26 -



 



pF

6

.

9

50

*

3

^

10

*

2

.

2

*

6

^

10

*

50

*

π

2

1

12

11





 C

C









nH

1056

6

^

10

*

50

*

π

2

50

*

3

^

10

*

2

.

2

12

11





 L

L

L13 and C13 should be large enough not to affect the impedance at IF output frequency. In some cases the

impedance matching can be optimized by L13 and C13.

For example, in the case of IF Output = 50MHz, Output Load Resistor (Rload) = 2.2k

 in 50 interface, it is

recommended to choose 2200nH and 1000pF as L13 and C13. If any correction is needed, it can be adjusted

by reducing the value of L13 and C13.

These calculated values are approximation. In some cases, some correction is needed due to the effect of

parasitic capacitance of external parts or/and PCBs. The impedance matching network components should be

decided through enough evaluation on AK1222.

Typical Performance using impedance matching network with LC is below. RF Input = 600MHz, IF Output =

50MHz, LO Input = 550MHz, Output Load Resistor (Rload) = 2.2k

, Vdd = 5V, Ta = 25C, LO Input Level =

0dBm.

Ref.

Value

Size

Part Number

RL1, RL2

1.1k



1005

KOA RK73K1ETP112

L11, L12

1000nH

2012

Murata LQW21HN1R0J00

C11, C12

10pF

1005

Murata GRM1552C1H100JA01

L13

2200nH

2012

Murata LQW21HN2R2J00

C13

150pF

1005

Murata GRM1552C1H151JA01