Patent ID: 7924100
Filing Date: 2011-04-12
Classification: H03J

Abstract:
1. A communication device, comprising: a frequency differentiation unit receiving a reference signal with a first frequency and a local pulse with a second frequency to generate a differential signal according to a difference between said first frequency and said second frequency; a decoding modulator connected with said frequency differentiation unit for receiving said differential signal; an embedded virtual crystal connected with said frequency differentiation unit for receiving said differential signal and generating a local signal; and a synthesizer coupled to said frequency differentiation unit and said embedded virtual crystal for receiving said local signal to generate said local pulse and to provide said frequency differentiation unit with said local pulse, wherein said frequency differentiation unit, said embedded virtual crystal and said synthesizer form a closed loop to adjust said second frequency of said local pulse according to said differential signal, and said local signal is sent to said decoding modulator for decoding said differential signal to generate a data signal when said differential signal is within a fixed error margin, or said second frequency of said local pulse is reset and resent to said frequency differentiation unit for renewing said differential signal when said frequency differential signal is out of said fixed error margin.