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參數(shù)資料
| 型號(hào)： | HMMC-1015 |
| 廠商： | AGILENT TECHNOLOGIES INC |
| 元件分類： | 衰減器 |
| 英文描述： | 0 MHz - 50000 MHz RF/MICROWAVE VARIABLE ATTENUATOR |
| 封裝： | 0.0579 X 0.024 INCH, 0.0056 INCH HEIGHT, DIE |
| 文件頁數(shù)： | 3/7頁 |
| 文件大?。?/td> | 399K |
| 代理商： | HMMC-1015 |
3
Applications
The HMMC-1015 is designed to be
used as a gain control block in an ALC
assembly. Because of its wide dynamic
range and return loss performance,
the HMMC-1015 may also be used
as a broadband pulse modulator or
single-pole single-throw, non-reflective
switch.
Operation
The attenuation value of the
HMMC-1002 is adjusted by applying
negative voltage to V
2. At any
attenuation setting, optimum VSWR is
obtained by applying negative voltage
to V
1. Applying negative voltage (V2)
to the gates of the shunt FETs sets
the source-to-drain resistance and
establishes the attenuation level.
Applying negative voltage (V
1) to the
gates of the series FETs optimizes
the input and output match for
different attenuation settings. In some
applications, a single setting of V
1 may
provide sufficient input and output
match over the desired attenuation
range (V
2). For any HMMC-1015 the
values of V
1 may be adjusted so that
the device attenuation versus voltage is
monotonic for both V
1 and V2; however,
this will slightly degrade the input and
output return loss.
The attenuation and input/output
match of the HMMC-1015 may also
be controlled using only a single
input voltage by utilizing the on-chip
DC reference circuit and the driver
circuit shown in Figure 4. This circuit
optimizes VSWR for any attenuation
setting. Because of process variations,
the values of V
REF, RREF, and RL are
different for each wafer if optimum
performance is required. Typical values
for these elements are given. The ratio
of the resistors R
1 and R2 determines
the sensitivity of the attenuation
versus voltage performance of the
attenuator. For more information on
the performance of the HMMC-1015
and the driver circuits previously
mentioned, see WPTC’s Application
Note #37, "HMMC-1021 Attenuator:
Attenuation Control." For more
S-parameter information, see WPTC’s
Application Note #44, "HMMC-1015
Attenuator: S-Parameters."
Assembly techniques
GaAs MMICs are ESD sensitive. ESD
preventive measures must be employed
in all aspects of storage, handling, and
assembly.
MMIC ESD precautions, handling
considerations, die attach and
bonding methods are critical factors in
successful GaAs MMIC performance
and reliability.
Agilent application note #54, "GaAs
MMIC ESD, Die Attach and Bonding
Guidelines" provides basic information
on these subjects.
Figure 1. Schematic
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