A micro-power active-RFID LSI with an all-digital RF-transmitting scheme achieves experimental 10-m-distance communication with a 1-Mbps data rate in the 300-MHz frequency band. The IC consists of an RF transmitter and a power supply circuit. The RF transmitter generates wireless signals without a crystal. The power supply circuit controls the energy flow from the battery to the IC and offers intermittent operation of the RF transmitter. The IC draws 1.6µA from a 3.4-V supply and is implemented in a 0.2-µm CMOS process in an area of 1mm². The estimated lifetime of the IC is over ten years with a coin-size battery.