MAX2640AUTT 查看數據表（PDF） - Maxim Integrated
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MAX2640AUTT Datasheet PDF : 9 Pages
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MAX2640/MAX2641
300MHz to 2500MHz SiGe
Ultra-Low-Noise Amplifiers
Table 3. MAX2640 Typical Noise Parameters at VCC = +3V, TA = +25°C
FREQUENCY (MHz)
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
fMIN (dB)
0.66
0.69
0.72
0.75
0.78
0.82
0.85
0.89
0.93
0.97
1.01
|Γ opt|
0.56
0.54
0.51
0.48
0.46
0.43
0.40
0.37
0.35
0.32
0.29
0.26
Γ opt ANGLE
21
25
30
35
40
45
50
56
62
68
77
84
Table 4. MAX2641 Typical Noise Parameters at VCC = +3V, TA = +25°C
FREQUENCY (MHz)
1500
fMIN (dB)
1.02
|Γ opt|
0.43
Γ opt ANGLE
44
1600
1.05
0.40
47
1700
1.08
0.38
50
1800
1.10
0.36
54
1900
1.14
0.32
58
2000
1.17
0.30
62
2100
1.20
0.28
66
2200
1.23
0.25
71
2300
1.27
0.22
77
2300
1.30
0.19
82
2500
1.34
0.17
91
RN (Ω)
12.5
11.9
11.3
10.8
10.2
9.7
9.3
8.8
8.3
7.9
7.4
7.0
RN (Ω)
12.4
11.8
11.3
10.8
10.3
9.9
9.4
9.0
8.6
8.3
8.0
Layout and Power-Supply Bypassing
A properly designed PCB is essential to any RF/micro-
wave circuit. Be sure to use controlled impedance lines
on all high-frequency inputs and outputs. The power
supply should be bypassed with decoupling capacitors
located close to the device VCC pins. For long VCC lines,
it may be necessary to add additional decoupling capac-
itors. These additional capacitors can be located further
away from the device package.
Proper grounding of the GND pins is essential. If the
PCB uses a topside RF ground, connect it directly to all
GND pins. For a board where the ground plane is not on
the component side, the best technique is to connect the
GND pin to the board with a plated through-hole close to
the package.
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