Patent ID: 8923762

Claim:
A communication device, comprising: a wireless LAN transceiver, for receiving a first signal in a first frequency band in a first period and for receiving a second signal in the first frequency band in a second period; a Bluetooth transceiver, for receiving a third signal in a second frequency band in the first period and for receiving a fourth signal in a third frequency band in the second period; an oscillator for generating a fifth signal and a sixth signal; a mixer for mixing the third signal and the fifth signal to generate a seventh signal, and for mixing the fourth signal and the sixth signal to generate an eighth signal; a wireless LAN demodulation circuit for demodulating the first signal and the second signal; and a Bluetooth demodulation circuit for demodulating the seventh signal and the eighth signal; wherein the first frequency band locates between a first frequency and a second frequency; the second frequency band locates between a third frequency and a fourth frequency; the third frequency band locates between a fifth frequency and a sixth frequency; the fifth signal and the sixth signal have a seventh frequency and a eighth frequency, respectively; the second frequency is higher than the first frequency; the fourth frequency is higher than third frequency; the sixth frequency is higher than the fifth frequency; the third frequency is higher than or equal to the second frequency; the sixth frequency is lower than or equal to the first frequency; the seventh frequency is higher than or equal to the fourth frequency; and the eighth frequency is lower than or equal to the fifth frequency.