Feedback Ultra-wideband Amplifier with Unbalanced Input and Balanced Output.

A new type of UWB LNA presents. The amplifier has got a novel feedback topology and load circuit that allows the designer to obtain a high voltage gain and matching in the wide frequency range from 3.1 GHz to 10.6 GHz without cascading, current reuse technique and an additional matching circuit. The key point of the amplifier is the source degeneration with resistive shunt series feedback and the load circuit based on the combined parallel-series resonance circuit. The voltage gain of the amplifier is 9.7 dB, matching is better than –10 dB, the noise figure lies between 5.4 and 7 dB in the whole frequency range.