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參數(shù)資料
| 型號(hào)： | AMMC-6640 |
| 元件分類： | 衰減器 |
| 英文描述： | 0 MHz - 50000 MHz RF/MICROWAVE VARIABLE ATTENUATOR |
| 封裝： | ROHS COMPLIANT, PLASTIC PACKAGE-4 |
| 文件頁數(shù)： | 11/11頁 |
| 文件大?。?/td> | 394K |
| 代理商： | AMMC-6640 |
9
AMMC-6640 Bias and Usage
The AMMC-6640 attenuator is driven by voltage ramps
placed on Vseries and Vshunt control pins. Operation in
this mode requires voltages between 0 to 1.5 volts for Vse
and 0 to 1.5 volts for Vsh. The recommended DC control
voltage range is Vse = 0 to 1.2 volts and Vsh = 0 to 1.2
volts. The simplied schematic for the MMIC die is shown
in Figure 19.
In the minimum attenuation state, the series FETs are
fully biased at 1.2 volts and the shunt FETs are in the full
“o” state at 0 volts. Inversely, for a maximum attenuation
state, the series FETs are “o” at 0 volts bias and the shunt
FETs are fully on at 1.2 volts. Achieving attenuation levels
in-between these two states requires voltage levels similar
to those in Table 4. Applying voltage to the shunt FETs sets
the source to drain resistance and establishes the main
attenuation level. The match is optimized by the amount
of bias applied to the series FETs. The match will determine
how at the attenuation level is across a broadband
operational range.
Figure 18. AMMC-6640 Schematic
Table 4. AMMC-6640 Typical Control Voltages
Attenuation (dB)
Vseries (V)
Vshunt (V)
0
1.2
0
2
0.440
0.325
4
0.435
0.383
6
0.430
0.416
8
0.420
0.440
10
0.410
0.465
12
0.400
0.480
14
0.385
0.505
16
0.375
0.535
18
0.360
0.575
20
0.350
0.650
22
0.346
0.845
max
0
1.2
Figure 19. Demonstration Board (available upon request)
Vse Vsh
RFO
RFI
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