Adaptively Filtering Trans-impedance Amplifier for RF Current Passive Mixers

Résumé du livre

Current Passive Mixers represent the state of the art for the signal down-conversion in wireless receivers. In such kind of structures, noise, distortion, and losses are strictly correlated to the stage following the mixer. This thesis proposed a trans-impedance amplifier (TIA) to sense the down-converted current with a new topology that adaptively filters the out-of-band interferers as a function of input current magnitude with a class-AB transconductor in the feedback network. The prototype is implemented in IBM 0.13Îźm CMOS technology, and shows low input impedance with a high-pass shaped noise and distortion profile. The filter cut-off frequency is reconfigurable between 2.8MHz and 12MHz. The prototype consumes 1.92mW of power from a 1.2V supply and the active die area is 0.45mm2. It achieves out-of-band SFDR between 86.8dB and 75.1dB, with the FOM varies between 182 dB(J-1) and 176 dB(J-1).