A design of ± 0.28 ppm temperature-compensated crystal oscillator in a 0.35 μm CMOS process
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A high-performance temperature-compensated crystal oscillator (TCXO) is presented. This paper proposes a new temperature sensor with a Σ–Δ analog to digital converter, and a voltage-controlled crystal oscillator, respectively, using two sets of independent power supply. The presented TCXO is implemented in a 0.35 μm 2P3 M standard complementary metal-oxide semiconductor process at a power supply of 3.3 V, and the total power dissipation is 21 mW. Measurement results indicate that the designed TCXO achieves ± 16 ppm output frequency tuning range and 135, − 141 dBc/Hz phase noise at 1, 10 kHz frequency offset, respectively, by using a 40 MHz fundamental AT-cut crystal resonator. With the temperature compensation, the frequency deviation is within ± 0.28 ppm over − 40 °C to 85 °C.
KeywordsOscillator Crystal Temperature-compensated TCXO VCXO Varactor
This work is sponsored by National Natural Program on Key Basic Research Project (973 Program) (No. 2015CB352103). The author would like to thank Dr. Jie Chen and Dr. Yang for their useful discussions and instruction.
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