Investigation of a new configuration of a two-stage CMOS wideband amplifier and a new CMOS wideband RF front-end for multistandard low-IF wireless receivers

A front-end, a combination of a low noise amplifier and a frequency converter, is an important building block in a radio receiver system. Very weak radio frequency signals need to be amplified before they are translated to the intermediate frequency or baseband signals. For multistandard wireless communication systems operating at different carrier frequencies, one of the important requirements is wideband receiver front-end capable of handling all these frequencies. Therefore, attention is made to design wideband amplifier and front-end circuit for the multistandard low intermediate-frequency wireless receiver.; In this thesis, a new configuration of a two-stage wideband amplifier is proposed and designed in CMOS 0.18 mum technology. Dual loop negative feedback is used to achieve the input/output wideband matching with -3 dB bandwidth of larger than 2.5 GHz.; Using the new configuration of the proposed wideband amplifier as the low noise amplifier, a new wideband front-end is proposed and designed in CMOS 0.18 mum technology. The overall front-end circuit is highly linear with input bandwidth of larger than 3 GHz. All the designs are mathematically analyzed and the simulation results justify the functionality of the circuits.