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A large set of photoswitches (PSW) with different configurations is tested. Using the device with a shortest gap length leads to the generation of frequency harmonics while increasing RF input electrical power. Hence, the spurious free dynamic range (SFDR) is reduced when the RF power is increased up to 13 dBm. This results from an electrical nonlinear response which is partially due to carrier velocity...
Photoconductive sampling of 10-GHz radio- frequency (RF) signal is demonstrated using interdigitated photoswitches made from low-temperature grown GaAs. We study the linearity of the device for RF input power ranging from -3 to 20 dBm. For moderate levels, the sampler shows a spurious-free dynamic range (SFDR) better than 40 dB. For the largest values, it exhibits a nonlinear response that deteriorates...
In this work, we study photoconductive sampling of RF signals using metal semiconductor metal structures with low-temperature grown GaAs (LTG-GaAs) as active media. The sampler is a photos witch (PS) embedded in a microwave coplanar waveguide (CPW) and it is triggered by ultra short optical pulses. Both the design of the electrodes and the semiconductor (SC) characteristics are optimized to ensure...
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