mobile phone handsets include a cmos front end configured for operating across multiple transmit and receive frequencies . the front end typically includes multiple receivers , each covering a different band allocated for cellular service , and requires large , expensive and power - intensive a / d converters and dsps . front - end circuits disclosed herein operate with a broadband software - defined radio , and include a receive low noise amplifier , transmit power amplifier , and an antenna matching network . the front - end provides broadband operation using relatively low power , and minimizes noise in the received signal .