A NEW CONCEPT FOR FRONT-END CIRCUIT INTEGRATION: FROM SINGLE-ENDED ANTENNA TO DIFFERENTIAL-INPUT CONNECTION WITHOUT ANY EXTERNAL BALUN

摘要

A new concept for a single-ended input front-end circuit design is proposed. The coupling of a single-ended low-noise amplifier (LNA) to a double-balanced cross-coupled mixer using a single-to-dif-ferential transformer is successfully implemented and then tested in the 5.725-5.825-GHz band in order to show its feasibility. Furthermore, this idea is even useful for wide-receive-band applications when the bandwidth of the LNA is designed widely.