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Attenuation range up to 100 dB
- Low
insertion losses
- High
isolation
- Low
switching time
- Fullband
operation
- Low
cost
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Applications
- Low
cost alternative for p-i-n modulators and polarization attenuators
- AM
of microwave signals.
- Power
control
- Lock-in
detection systems
Description
ELVA-1
Voltage-Controlled Variable Attenuators VCVA series is built
on the base of PIN diodes as an active element. Modern technology
allows to combine advantages of different types of attenuators
and modulators in one device. Fullband operation, accuracy,
typical 60 dB attenuation range and small insertion losses are comparable
with specification for polarization attenuators. On the other
hand a small switching time allows to use the device instead
Faraday rotation ferrite modulators or ON/OFF type p-i-n modulators.
The attenuators are designed as a gold or silver covered waveguide
section and have a high reliability. The basic unit is a current
controlled attenuator. We propose also an external driver
which provides a voltage-current conversion and a switching
time up to the 25 µsec. We supply each device with personal
calibration characteristics. Typical characteristics for the
VCVA-10 model are shown on two plots below: attenuation versus
control voltage with fixed frequency and attenuation versus
frequency with different control voltages.
Attenuation\Current
depencies for attenuators we offer from STOCK
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Model
Number
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Model
Number
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Frequency,GHz
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75-110
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60-90
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50-75
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26,5-40
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Frequency,GHz
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Frequency
Band
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W
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E
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V
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Ka
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Frequency
Band
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Outline
Drawing >
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<
Outline Drawing
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Electrical
Specification
*The
models with 60 dB Isolation are available upon request
**Negative DC Power Source is needed only in fast switching
mode (see below)
***Guaranteed for Rise Time 0-90% RF and Fall Time 100-10%
RF. Model with twice lower switching time are available upon
request for the 50-170GHz frequency range.
Mechanical
Specification
Optionally
each device may be supplied with a controller, that provides
square- wave pulse or sinusoidal modulation with manually
adjusted frequency and depth of modulation. Sinusoidal 10
dB modulation is provided with frequencies up to 10 kHz. A
card of Digital Analog Converter for PC microcomputer with
software for the precision control of attenuator is available
optionally. It allows to control the attenuation with 0.05dB
step.
Digital
Driver with serial RS-485 interface is available: model
DVC-RS-485/12 (PDF format ~20Kb)
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