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800MHz to 1000MHz Variable-Gain
Amplifier with Analog Gain Control
V CC
RF INPUT*
C3
C4
36
35
34
33
32
31
30
29
28
C5
GND
1
27
GND
OUT_A
2
EP
26
AMP_IN
V CC
V CC
C2
GND
GND
V CC
GND
3
4
5
6
MAX2056
ATTENUATION
25
24
23
22
V CC
GND
GND
GND
C6
C13
C1
GND
IN_A
7
8
CONTROL
CIRCUITRY
21
20
GND
OUT
C7
RF
OUTPUT
GND
9
19
GND
10
11
12
13
14
15
16
17
18
R1
V GC
+
-
C10
C15
V CC
C9
C8
V CC
C14
R2
* 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.
Figure 1. Typical Application Circuit
Detailed Description
The MAX2056 general-purpose, high-performance VGA
with analog gain control is designed to interface with
50 ? 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.
10
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