A fully integrated CMOS VCXO-IC with low phase noise, wide tuning range and high tuning linearity*Project supported by the National Natural Science Foundation of China (No. 61350007). (June 2015)

• Record Type: Journal Article
• Authors: Yang, Yanjun; Zeng, Yun
• Is Part Of: Journal of semiconductors. Volume 36:Number 6(2015:Jun.)
• Page Start: 57
• Publication Date: 2015-06
• Subjects: Semiconductors -- Periodicals; 621.38152
• DOI: 10.1088/1674-4926/36/6/065009
• Languages: English
• ISSNs: 1674-4926

Abstract

<abstract> <title>Abstract</title> <p>This paper describes a low phase noise, wide tuning range and high tuning linearity CMOS voltage controlled crystal oscillator IC (VCXO-IC) with LVCMOS and LVPECL output. A differential coupled frequency doubling Colpitts oscillator is adopted to obtain low noise 2× frequency output. Wide tuning range and high linearity are simultaneously achieved by using MOS varactor arrays. The measurement results show that the designed VCXO-IC achieves −134 dBc/Hz phase noise at 1 kHz offset frequency and ± 135 ppm output frequency tuning range within 3% linearity by using 40 MHz fundamental AT-cut crystal. The VCXO-IC is fabricated in the chartered 0.35 <italic>μ</italic>m standard CMOS process and occupies a total silicon area of 2.4 mm².</p> </abstract>