Linear Driver for

PIN Diode Attenuators

Rev. V2

MADR-007098

2

2

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2

Figure 1. Linear Attenuator Schematic

MADR-007098-000100 Driver with MAAV-007090-000100 VVA

-2.0

-1.5

-1.0

-0.5

0.0

0.5

1.0

1.5

2.0

0

3

6

9

12

15

18

21

24

27

30

Attenuation (dB)

Frequency: 1960 M Hz

Vcont: 0 to 4.0V

Figure 2. Typical Attenuation Error

MADR-007098

-000100

IN

REF

3

R2

680

R3

(PTCT)

330

R1

39K

Vcontrol

(0 to 4V)

5

4

VOLTAGE

VARIABLE

ATTENNUATOR

12

+Vcc

R4

360

C1

.01 µF

14

7

2

10

1,3,4

5,6,8

9,11,12

16,14,13

NOTES:

a. Transfer function is 7.5 dB/V

b. Vcontrol is 0V to 4.0V

c. +Vcc is 5.0V ± 5%

d. R3 is a positive temperature coefficient thermistor.

e. Attenuator is MAAV-007089-000100 or MAAV-007090-000100

RFin

RFoutput