Patent ID: 8243863
Filing Date: 2012-08-14
Classification: G06K,H04B,H04L,H04Q

Abstract:
1. A semiconductor device comprising: an antenna circuit which transmits and receives data; a first demodulation signal generation circuit configured to demodulate a signal from the antenna circuit, whose modulation factor is greater than or equal to 95% and less than or equal to 100%; a second demodulation signal generation circuit configured to demodulate a signal from the antenna circuit, whose modulation factor is greater than or equal to 95% and less than or equal to 100% and a signal from the antenna circuit, whose modulation factor is greater than or equal to 10% and less than or equal to 30%; and a logic circuit configured to select one of the signal demodulated in the first demodulation signal generation circuit and the signal demodulated in the second demodulation signal generation circuit to modulate the signal selected by the logic circuit, wherein the logic circuit is configured to select the signal demodulated in the first demodulation signal generation circuit when the antenna circuit transmits data, and wherein the logic circuit is configured to select the signal demodulated in the second demodulation signal generation circuit when the antenna circuit receives data.