Basically, the navigation signals transmitted by those systems follow the same trilateration positioning principles as the GPS but they differ in terms of signal definition (frequency, bandwidth and modulation). These differences result in GPS receivers’ design (RF front-end and digital signal processing) not being fully compatible with the other systems. On the other hand, users are looking for higher precision, better satellite visibility, greater integrity and more robustness. The combination of the various GNSS signals in a single GNSS receiver can help satisfy the users’ needs to some extent. Therefore, the logical step is to design a universal GNSS receiver that could receive and process the signals from various satellite navigation systems. However, one limitation in the design of a universal GNSS receiver is the RF front-end, which may be complex and/or technically limited for covering all potential GNSS bands and signals. Furthermore, the sensitivity of the RF front-end is essential in several applications using high sensitivity receivers.