Title :
A 10GHz nonlinear cosine-weighted digital-to-analog converter for high-speed direct digital synthesis
Author :
Yang, Dayu ; Dai, Foster F.
Author_Institution :
Dept. of Electr. & Comput. Eng., Auburn Univ., AL, USA
Abstract :
A SiGe cosine-weighted digital-to-analog converter (DAC) with 10 GHz sampling rate is presented. The nonlinear DAC is used in a direct digital synthesis (DDS) to replace the conventional look up table and the linear DAC. It takes the advantage of high switching speed of SiGe current switches and uses the current mode logic (CML) circuits to realize the digital control logic. The DAC is designed using a 47 GHz SiGe technology and achieves a maximum 5 GHz output frequency with 10 GHz clock.
Keywords :
Ge-Si alloys; current-mode logic; digital-analogue conversion; direct digital synthesis; CML circuits; DAC; DDS; Ge-Si; SiGe current switches; cosine-weighted digital-to-analog converter; current mode logic circuits; digital control logic; high-speed IC; high-speed direct digital synthesis; nonlinear digital-to-analog converter; Circuit synthesis; Digital control; Digital-analog conversion; Frequency; Germanium silicon alloys; Logic circuits; Sampling methods; Silicon germanium; Switches; Switching circuits;
Conference_Titel :
Silicon Monolithic Integrated Circuits in RF Systems, 2004. Digest of Papers. 2004 Topical Meeting on
Print_ISBN :
0-7803-8703-1
DOI :
10.1109/SMIC.2004.1398170
