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Page 6 of 8

Issue A

LANSDALE Semiconductor, Inc.

ML1490

6

Figure 19. 60 MHz Power Gain Test Circuit

Figure 20. Video Amplifier

Figure 21. 30 MHz Amplifier

(Power Gain = 50 dB, BW

1.0 MHz)

Figure 22. 100 MHz Mixer

L1 = 7 turns, #20 AWG wire, 5/16" Dia.,5/8" long

L2 = 6 turns, #14 AWG wire, 9/16" Dia.,3/4" long

C1,C2,C3 = (1–30) pF

C4 = (1–10) pF

0.0001

µF

Shield

Output

(50

Ω)

+12 Vdc

0.001

µF

2

6

1

3

4

5

L2

L1

VAGC

C1

Input

(50

Ω)

C4

C3

C2

VR(AGC)

8

RAGC

ML1490

1

8

3

4

5

7

2

+12 Vdc

VR(AGC)

ei

5.6 k

10 k

RL

eo

0.001

µF

VR(AGC)

1.0

µF

0.001

µF

0.001

µF

1.0

µF

1.0

µF

ML1490

7

8

1

2

4

6

5

+12 Vdc

10

µH

5.6 k

L1

T1

C2

RL = 50 Ω

1 – 10 pF

VR(AGC)

0.002

µF

(1 – 30) pF

Input

(50

Ω)

VAGC

38 pF

L1 = 12 turns, #22 AWG wire on a Toroid core,

(T37–6 micro metal or equiv).

T1: Primary = 17 turns, #20 AWG wire on a Toroid core, (T44–6).

Secondary = 2 turns, #20 AWG wire.

0.002

µF

3

ML1490

+12 Vdc

(1 – 30) pF

(1 – 10) pF

100

L1

L2

IF Output

Signal Input

(100 MHz)

Input from

local oscillator

(70 MHz)

VAGC

6.0 V

(30 MHz)

L1 = 5 turns, #16 AWG wire, 1/4", ID Dia., 5/8" long

L2 = 16 turns, #20 AWG wire on a Toroid core, (T44–6).

0.002

µF

0.002

µF

10

µH

(1 – 30) pF

(1 – 10) pF

7

ML1490

5

6

4

3

7

8

2

1

Figure 23. Two–Stage 60 MHz IF Amplifier (Power Gain 80 dB, BW 1.5 MHz)

3

2

5

6

1

8

3

2

4

5

6

1

8

200

µH

(1–10) pF

Input

(50

Ω)

VR(AGC)

10 k

5.1 k

0.002

µF

+12 Vdc

7

(1–10) pF

1.0 k

(1–10) pF

0.002

µF

T1

39 pF

0.002

µF

ML1490

ML1490

7

Shield

Shield

(1–10) pF

0.001

µF

Output

(50

Ω)

RFC

T2

24 pF

RFC

10

µH

T1: Primary Winding = 15 turns, #22 AWG wire, 1/4" ID Air Core

Secondary Winding = 4 turns, #22 AWG wire,

Coefficient of Coupling

≈ 1.0

T2: Primary Winding = 10 turns, #22 AWG wire, 1/4" ID Air Core

Secondary Winding = 2 turns, #22 AWG wire,

Coefficient of Coupling

≈ 1.0

4

≈

Legacy Applications Information