Browsing by Subject "Amplifiers (Electronics)."

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    2-18 GHZ MMIC distributed amplifiers
    (1994) Ergun, Sanlı
    Using GaAs Monolithic Microwave Integrated Circuit (MMIC) technology three distributed amplifiers are realized. Two of these amplifiers employ single gate FETs and operate in the 2-18 GHz frequency range. They have 4.5 and 6.5 dB gain, respectively. The third amplifier utilizes cascode connected FETs. This amplifier operates in the 2-20 GHz range and has a gain of ~10 dB. All the three amplifiers have input and output return losses better than 10 dB. The isolation of the amplifiers with single gate FETs is better than 20 dB, whereas the cascode connection improves the isolation over 30 dB. The amplifiers are designed for a 50O-svstem. The simulations are made linearly, and the results match the theoretical work. In the design of these amplifiers a more detailed method is used in which the artificial transmission lines are investigated and optimized in their frequency behaviour. Besides, to realize these amplifiers, a new parametrized cell library for GEC-Marconi’s F20 foundry process is created and utilized.
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    Femtosecond optical parametric amplifiers based on beta-barium borate crystals
    (1996) Köprülü, Kahraman Güçlü
    In this thesis we describe our experiments to construct and evaluate nondegenerate and degenerate optical parametric amplifiers (OP.-\) based on betabarium borate (BBO) crystals. VVe used a mode-locked Titanium.Sapphire laser at a wavelength of 830 nm and a pulse duration of 140 fs. The Ti:Sapphire laser was frequency doubled with a type-I BBO crystal. The frequency doubled output of the laser was used to pump our OP.As. For 800 mVV’ of laser output, 300 mVV of maximum output power at the second harmonic was obtained, corresponding to a 38% conversion efficiency. Both type-I and type-II BBO crystals were used for parametric amplification. The type-II crystal resulted in a nondegenerate OPA due to the orthogonal polarizations of the signal and the idler beams. A degenerate OP.A was achieved with the type-I crystal. Phcise sensitive nature of the degenerate OPA, and phase insensitive nature of the nondegenerate OP.A were observed. The maximum gain of the degenerate OPA was measured to be 1.45, whereas the maximum gain of the nondegenerate OP.A was measured to be 1 .0 2 .