數位至類比轉換器及其操作方法DIGITAL-TO-ANALOG CONVERTER AND PERFORMING METHOD THEREOF

專利類型

發明

專利國別 (專利申請國家)

中華民國

專利申請案號

100132605

專利證號

I 481202

專利獲證名稱

數位至類比轉換器及其操作方法DIGITAL-TO-ANALOG CONVERTER AND PERFORMING METHOD THEREOF

專利所屬機關 (申請機關)

國立成功大學

獲證日期

2015/04/11

技術說明

傳統二元權重切換式電流汲取數位/類比轉換器由預先選定的電流源群組形成陣列。此專利提出一種隨機旋轉電流源順序方法，只需採用旋轉電流源即可有效率的實現隨機二元權重式輸出，以實現動態元件匹配技術。此技術不需使用溫度計編碼器，故可有效地以低成本方式高速地實現動態元件匹配特性。採用此技術將可用小面積實現電流源，並消除小面積造成的線性度失真，以展現出極佳的動態無失真範圍。比起傳統設計，節省至少80%面積成本。比起一流文獻之10~12位元數位類比轉換器，本設計有最佳之性能評比(FOM)。 Conventional binary-weighted current-steering DACs are generally operated with current groups where each group is binary-weighted and formed with predetermined members of a unit current-source array. This patent proposes a random rotation current-source sequence (RRCS) that efficiently performs dynamic-element matching (DEM) by randomly rotating the sequence of these units to form new binary-weighted current groups for each DAC output. Without using binary-to-thermometer decoders, RRCS features its simplicity and compactness of DEM realization. Compared to conventional binary-weighted DACs, RRCS binary-weighted DACs are insensitive to the mismatch of small-size current-sources and exhibit better dynamic performance. Compared to other designs, at least 80% area saving is obtained. The three popular figures-of-merit (FOMs) are used to compare this design with other state-of-the-art 10~12-bit DACs, the proposed design performing best with two FOMs.

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