LT5503

17

Figure 7. Evaluation Circuit Schematic for 1.2GHz, 1.9GHz and 2.4GHz Applications

1

2

3

4

5

6

7

8

9

10

1

2

3

4

5

6

12

11

10

9

8

7

20

19

18

17

16

15

14

13

12

11

LO1IN

LO2IN

LT5503

5503 F07

1

2

3

4

5

*C9

MIXER

OUT

T1

GC1

MODIN

LO1

DMODE

GC2

MODOUT

LO2

MODEN

MIXEN

*C5

*C6

*C10

C20

1000pF

C18

1

µF

*L6

*L5

C41

1

µF

OPT

C42

1

µF

OPT

C39

4.7

µF

C17

1

µF

C33

4.7

µF

C27

0.01

µF

C32

4.7

µF

C22

1000pF

C1

2.2pF

*C7

C19

0.01

µF

*C23

*C2

C14

100pF

*C3

MODRFIN

MODRFOUT

*C11

C12

1000pF

C21

0.01

µF

C13

8.2pF

*C4

*L3

*L4

R2

47

Ω

*R1

*L1

*L2

21

C45

0.1

µF

C24

4.7

µF

C43

8.2pF

R4

2.7k

R8

2.7k

R7

20k

R6

20k

R5

20k

V1

E1

E4

E3

E2

V2

V4

V3

GND

J2

J7

J1

J4

J5

J6

J3

LT5503

–

+

–

+

–

+

–

+

R3

56

Ω

1%

R25

49.9

Ω

R21

10k

1%

R23

10k

1%

R13

510

Ω

1%

C34

4.7

µF

R12

56

Ω

1%

R16

510

Ω

1%

R15

510

Ω

1%

R14

510

Ω

1%

5

6

5

6

7

7

8

8

U2-1

LT1807

U2-2

LT1807

U3-1

LT1807

U3-2

LT1807

4

4

2

2

3

3

1

1

C35, 39pF

C36, 39pF

C38, 1pF

C37, 1pF

R19

510

Ω

1%

R26

49.9

Ω

R27

49.9

Ω

R17

510

Ω

1%

C40

4.7

µF

C15

1

µF

C16

1

µF R28

49.9

Ω

R18

510

Ω

1%

R20

510

Ω

1%

R22

10k

1%

C29

0.01

µF

C28

4.7

µF

R24

10k

1%

SW1

Q-IN

R29

10

Ω

I-IN

*Application Dependent Component Values

1.2GHz Matching

(Modulator Only)

1.9GHz Matching

2.4GHz Matching

L1

33nH

22nH

18nH

L2

12nH

5.6nH

2.7nH

L3

12nH

4.7nH

2.7nH

C2, C3, C7

39pF

15pF

8.2pF

C10

2.7pF

1.8pF

1.2pF

C23

n/a

1.5pF

1.5pF

R1

240

Ω

390

Ω

390

Ω

C4

n/a

15pF

8.2pF

C5, C6

n/a

1.8pF

2.2pF

C9

n/a

15pF

2.7pF

C11

n/a

2.2pF

1.2pF

L4

n/a

6.8nH

4.7nH

L5,L6

n/a

5.6nH

2.2nH

T1

n/a

LDB15C101A1900 LDB15C500A2400

APPLICATIO S I FOR ATIO