Wireless signal receiving device and method

摘要

The present invention discloses a wireless signal receiving device and method capable of receiving three or more signals of different central frequencies. An embodiment of said device comprises: a receiving circuit operable to generate a reception signal according to a wireless signal including a first, second, and third wireless signals of different central frequencies; a mixer operable to generate a mixing signal by processing the reception signal according to an oscillation clock in which the mixing signal includes a first, second and third intermediate-frequency (IF) signals and the central frequency of the third IF signal is higher than the other two; and a digital signal generating circuit operable to generate a first, second and third digital signals by processing the first, second and third IF signals according to a sampling frequency in which the sampling frequency is lower than two times the maximum frequency of the third IF signal.

主权项

1. A wireless signal receiving device capable of receiving three or more signals of different central frequencies, comprising:
a receiving circuit operable to generate a reception signal according to a wireless signal including a first, second and third wireless signals of different central frequencies; a mixer operable to generate a mixing signal by processing the reception signal according to a local oscillation clock in which the mixing signal includes a first, second and third intermediate-frequency (IF) signals related to the first, second and third wireless signals in turn while the maximum frequency of the third IF signal is higher than the maximum frequency of the first and second IF signals; a digital signal generating circuit including:
a first digital signal generating path operable to process at least one of the in-phase and quadrature-phase parts of the mixing signal according to the central frequency and bandwidth of the first IF signal and a first sampling frequency, and thereby generate a first digital signal;a second digital signal generating path operable to process at least one of the in-phase and quadrature-phase parts of the mixing signal according to the central frequency and bandwidth of the second IF signal and a second sampling frequency, and thereby generate a second digital signal; anda third digital signal generating path operable to process at least one of the in-phase and quadrature-phase parts of the mixing signal according to the central frequency and bandwidth of the third IF signal and a third sampling frequency, and thereby generate a third digital signal, wherein the third sampling frequency is lower than the double of the maximum frequency of the third IF signal; and a control circuit coupled with the digital signal generating circuit, operable to turn off some or all of at least one of the first, second and third digital signal generating paths according to a prescribed condition.