A hybrid wideband amplifier having bandwidth from 5MHz to 2000MHz with a gain of $10db\pm3dB$ is designed and implemented by using a lossy matched network and GaAs FET. The GaAs FET exhibits a flat gain below 800MHz and a 6dB/octave gain roll off above 800MHz. A low frequency amplifier loaded with resistor and a high frequency impedance matching by using a transmission line are combined to frequency range from 5.0 to 800MHz. The lossless impedance matching circuit realized by the transmission lines is employed. Above two methods are combined by using decoupling transmission line transformers in the high frequency band (800 to 2000MHz) to decouple R-C networks and to decouple transmission line matching in the low frequency band (5 to 800MHz). The bias circuit is implemented by self bias network. This concept is implemented as two stage GaAs FET amplifier which is measured to a 10dB gain within a 2dB fluctuation over the frequency band from 5 to 2000MHz and its noise figure is measured as 4.5dB at 2.0GHz and gradually increase 9.5dB at 50MHz as the frequency decreases.
