應用於 UHF 頻段 RFID 標籤之充電幫浦電路及十位元250MHz電流導向數位類比轉換器之研究

In this thesis achieve circuit is applied to UHF 915MHz RFID Tags , transfering small radio waves into stable DC voltage for the use of next stage circuit. Because RF signal losses quickly in air, much smaller than -15dBm, the issue of using a charge pump to supply sufficient and stable DC voltage is important. And this technology can be further applied in wireless charging technology, not only in wireless sensor system but also in various technology products such as mobile phones, MP3, wireless communications, and camera…In this thesis, I implement the charge pump circuits by TSMC 18µm 1P6M process. In order to achieve a stable supply meet the specifications of the DC voltage, the circuit layout includes a matching network, voltage multiplier, voltage limiting circuit, reference voltage circuit, and Regulator. The simulation and layout of the thesis is to achieve a 250MHz 10bits current steering DAC, and is expected to complete tape out by 35um 2p4m process provided by Taiwan Semiconductor Manufacturing Company provided . The circuit layout design has two parts - digital and analog. To reduce the glitch and differential nonlinearity (DNL), integral nonlinearity (INL) and to maintain the transfer curve monotonic the circuit is designed to be segmented structure, in which the highest 6bits MSB is the thermometer decoder and the lowest 4bits LSB is weighted binary code. The circuit is composed of 4 main parts: (1) digital circuit (2) clock drive, buffer (3) Deglitch Latch (4) current units. And current steering DAC output current do not need to output buffer can Directly drive the load resistance, so better than other architecture has speed advantages.