Tx Leakage Impact on Analog-Digital Conversion in Zero-IF Receivers

Transmitter leakage has a significant impact on the system performance in mobile devices using zero-IF receivers and thus requires a suitable compensation. In contrast to analog approaches, digital Tx leakage compensation approaches can easily be reconfigured and therefore are highly attractive for future mobile devices, using software defined radios. In this contribution we show that Tx Leakage reduces the SNR at the ADC output. However, this SNR loss is negligibly weak in presence of moderate Tx leakage. This proves that compensating the Tx leakage in digital domain is a suitable approach to lower the requirements on the analog transceiver front end and to facilitate the design of software defined radios.