[[alternative]]Digital-to-Analog Converter Based on Multiple Current Mirrors

碩士積體電路設計研究所[[abstract]]本論文中，提出一個新的電流鏡式數位類比轉換器。傳統的溫度計碼式數位類比轉換器雖然有線性度佳及良好的單調性與動態效能等優點，可是卻必須使用到大量的解碼電路和單位電流源。電流鏡式數位類比轉換器的架構中使用了多組的電流鏡取代傳統的電流源架構，其優點可以有效減少單位電流源的數目，因此，整體電路的晶片面積和功率消耗都可以有效降低。 本論文使用TSMC 0.35和TSMC 0.18 製程，分別完成六位元和八位元電流鏡式數位類比轉換器的設計。以八位元雙端數位類比轉換器為例，使用本論文的電流鏡式架構，在操作時脈為每秒取樣一百萬次時，輸入一個10 MHz的正弦波信號，操作電壓為3.3V，其功率消耗為27.5 mW，而傳統使用單位電流源架構的數位類比轉換器在相同條件下的功率消耗為45 mW [1]，因此可知我們的電流鏡式架構減少了約38 %的功率消耗。 本論文提出的電流鏡式數位類比轉換器可以降低電路複雜度，有效減少電晶體個數，進而降低電路功率消耗，相當適合低功率電路的相關應用。[[abstract]]In this thesis, a novel current mirror digital-to-analog converter is proposed. Although traditional thermometer-coded DAC has good linearity and better dynamic performance, a lot of decoders and current sources have been used. In this design, we use current mirrors to replace current sources. So the advantages of this design are to have lower power consumption and smaller chip area. We implemented 6-bit DAC and 8-bit DAC, respectively. The 6-bit DAC is implemented by TSMC 0.18-μm, 1P6M CMOS process. The 8-bit DAC is implemented by TSMC 0.35-μm, 2P4M CMOS process. In the 8-bit current mirror DAC, when we input a 10 MHz sine waveform, the DAC consumes 27.5 mW at the sample rate of 100 MHz with the supply voltage of 3.3 V. The traditional DAC consumes 45 mW[1] in the same condition. The 8-bit current mirror DAC achieves power consumption reduction of 38%. The Current Mirror DAC reduces the complexity of the circuit and the transistor counts. The DAC presents smaller power consumption among the recent researches