BlackBerry Limited
Supporting multiple frequency bands

Abstract:

A channel sharing method includes receiving a signal in a frequency band. The frequencies in the signal above a cutoff frequency are filtered to generate a filtered signal. The cutoff frequency is determined based on a frequency region that includes a plurality of frequency bands. The filtered signal is amplified using a mixer-tuned low noise amplifier (LNA). The mixer-tuned LNA includes a passive switching mixer and an LNA. The passive switching mixer presents a tunable impedance to the LNA. The LNA provides a voltage gain to the passive switching mixer. The voltage gain being proportional to the tunable impedance.