Title :
A 6GHz direct digital synthesizer MMIC with nonlinear DAC and wave correction ROM
Author :
Wu, Danyu ; Chen, Gaopeng ; Chen, Jianwu ; Liu, Xinyu ; Zhao, Lixin ; Jin, Zhi
Author_Institution :
Inst. of Microelectron., Chinese Acad. of Sci., Beijing, China
Abstract :
This paper proposes a new DDS architecture combined with Nonlinear DAC and Wave-Correction-ROM (WCR) which shows both high operating speed and accuracy. Based on this architecture, a 6 GHz 8-bit DDS MMIC is designed and fabricated in 60 GHz GaAs HBT Technology. The DDS MMIC includes 8-bit pipeline accumulator, an 8×8×3 bits WCR, two combined DACs and an analog Gilbert Cell for sine-wave generation with 8-bit amplitude resolution. The DDS chip is tested in on-wafer measurement system. The measured spurious free dynamic range (SFDR) is 33.96 dBc with 2.367 GHz output under a 6 GHz maximum clock (FCW=0×65). It shows an average SFDR of 37.5 dBc and the worst case SFDR of 31.4 dBc (FCW=0×70) within the whole Nyquist band under a 5 GHz clock frequency. The whole chip occupies 2.4×2mm2 of area consuming 3.27 W of power from a single -4.6 V power supply.
Keywords :
III-V semiconductors; MMIC; digital-analogue conversion; direct digital synthesis; gallium arsenide; heterojunction bipolar transistors; integrated circuit design; millimetre wave bipolar transistors; read-only storage; DDS architecture; GaAs; GaAs HBT technology; MMIC; Nyquist band; amplitude resolution; analog Gilbert cell; clock frequency; direct digital synthesizer; frequency 2.367 GHz; frequency 5 GHz; frequency 6 GHz; nonlinear DAC; on-wafer measurement system; pipeline accumulator; power 3.27 W; sine-wave generation; spurious free dynamic range; voltage -4.6 V; wave correction ROM; Clocks; Dynamic range; Gallium arsenide; Heterojunction bipolar transistors; MMICs; Pipelines; Read only memory; Semiconductor device measurement; Synthesizers; System testing; digital-to-analog converter (DAC); direct digital synthesizer (DDS); emitter coupled logic (ECL); sine-weighted DAC; wave correction ROM (WCR);
Conference_Titel :
Radio Frequency Integrated Circuits Symposium (RFIC), 2010 IEEE
Conference_Location :
Anaheim, CA
Print_ISBN :
978-1-4244-6240-7
DOI :
10.1109/RFIC.2010.5477279