Patent ID: 7532665
Filing Date: 2009-05-12
Classification: H04B

Abstract:
1. A wireless communication apparatus for transmission/reception of a wireless communication signal, comprising: first and second circuits for processing a transmission/reception signal; an oscillator for generating a reception clock on a first circuit side, the reception clock being used for an operation reference; a first interface for supplying the reception clock from said first circuit to said second circuit; a second interface for inputting, to said first circuit, transmission data output from said second circuit synchronously with the reception clock supplied from said first circuit; and delay compensating means for compensating for a delay between the reception clock and transmission data at said first circuit, the reception clock and transmission data being input via said second interface, wherein, in a data transmission mode a data transmission process is executed, and in a calibration mode a delay time of transmission data is computed, and in said calibration mode, said delay compensating means sends a calibration pulse having a duration over an anticipated maximum delay time from said first circuit to said second circuit via said first interface, and compensates for a delay time on the basis of a delay between a pulse looped-back from said second circuit to said first circuit via said second interface and the original calibration pulse, and in accordance with a phase difference between the pulse looped-back from said second circuit to said first circuit via said second interface and the original calibration pulse, said delay compensating means compensates for a delay time less than one clock period and inserts a proper delay amount into transmission data to make the transmission data have the maximum delay time.