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1300MHz to 2700MHz 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
V CC
C2
OUT_A
GND
GND
V CC
GND
2
3
4
5
6
MAX2057
ATTENUATION
EP
26
25
24
23
22
AMP_IN
V CC
C6
GND
GND
GND
V CC
C13
C1
GND
IN_A
GND
7
8
9
10
11
CONTROL
CIRCUITRY
12
13
14
15
16
17
18
21
20
19
GND
OUT
GND
C7
0.06in LONG FR4 50 ?
TRANSMISSION LINE
C17
RF
OUTPUT
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 MAX2057 general-purpose, high-performance VGA
with analog gain control is designed to interface with
50 ? systems operating in the 1300MHz to 2700MHz
frequency range.
The MAX2057 integrates two attenuators to provide
21dB or 42dB 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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