Detailed Description

The MAX2056 general-purpose, high-performance VGA

with analog gain control is designed to interface with

50

Ω systems operating in the 800MHz to 1000MHz fre-

quency range.

The MAX2056 integrates two attenuators to provide

22dB or 44dB of precision analog gain control, as well

as a two-stage amplifier that has been optimized to

provide high gain, high IP3, low noise figure, and low-

power consumption. The bias current of each amplifier

stage can be adjusted by individual external resistors

to further reduce power consumption for applications

that do not require high linearity.

800MHz to 1000MHz Variable-Gain

Amplifier with Analog Gain Control

10

______________________________________________________________________________________

MAX2056

27

EP

26

25

24

23

32

31

30

29

28

GND

GND

GND

GND

OUT

GND

GND

GND

GND

GND

GND

GND

OUT_A

GND

IN_A

C4

C7

C6

C10

C13

C5

RF

OUTPUT

R1

R2

C2

C1

C15

C9

C3

C14

C8

RF INPUT*

*NOTE: CONNECT THE INPUT ACCORDING TO THE SOLID BOLD LINE IF ONE ATTENUATOR

IS USED. CONNECT THE INPUT ACCORDING TO THE BROKEN LINE IF TWO ATTENUATORS ARE USED.

AMP_IN

36

35

34

33

14

15

16

17

18

10

11

12

13

22

20

21

19

5

4

3

2

9

8

7

6

1

+

-

ATTENUATION

CONTROL

CIRCUITRY

Figure 1. Typical Application Circuit