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.
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