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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 d Bc/Hz phase noise at 1 k Hz 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 chartered0.35 m standard CMOS process and occupies a total silicon area of 2.4 mm2.
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 obtained to obtain low noise 2 frequency output. Wide tuning range and high linearity were using by MOS varactor arrays. The measurement results show that the designed VCXO-IC achieves 134 d Bc / Hz phase noise at 1 k Hz 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 mm standard CMOS process and occupies a total silicon area of 2.4 mm2.