Patent ID: 7580675
Filing Date: 2009-08-25
Classification: H04B

Abstract:
1. A data communication apparatus having an ID-tag function and an ID-tag read-write function, comprising: a control circuit configured to generate data; and an analog front-end circuit electrically connected between an antenna and the control circuit, the antenna being configured to receive a signal from other ID tags and to send a signal from the apparatus; a first modulation circuit configured to modulate data to be transmitted to another ID-tag read-write device as a response to a request from said another ID-tag read-write device and to send the modulated data to the antenna; a second modulation circuit configured to modulate data to be transmitted to other ID tags; a driver circuit configured to amplify an output from the second modulation circuit to drive the antenna; a demodulation circuit configured to demodulate data sent from the other ID tags and demodulate data from said another ID-tag read-write device; and an input switch configured to selectively input data to one of the first and second modulation circuits, the data being sent from the control circuit to the analog front-end circuit.