| 摘要 |
PURPOSE:To attain low power consumption by bringing a receiver to a short- time operating state intermittently at a low duty to reduce the operating time of the receiver during standby. CONSTITUTION:An input to an antenna 1 is tuned and selected by a reception circuit 2 in the receiver and the result is given to a pulse shaping circuit 3, and its output is given to one input of an AND circuit 4 and a data processing circuit 5. A pulse P whose pulse width t3 is less than 1/10 of a period t2 being a half or below a prescribed duration time t1 of a reader pulse DR is outputted periodically from a timer circuit 7. The pulse P is given to other input terminals of the AND circuit 4 and one input of an OR circuit 8. The output of the AND circuit 4 is given to a trigger input terminal of a multivibrator 9 outputting a pulse having a sufficient prescribed time t4 do receive the data D1-D4 and its output pulse is given to the other input terminal of the OR circuit 8. The supply of the operating voltage to the reception circuit 2 and the pulse shaping circuit 3 is subjected to intermittent control by the output of the OR circuit 8. |
