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Temperature compensated ring oscillator based VCO
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DOI：10.1016/j.aeue.2022.154195.png)
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Frequency drift due to temperature variations is a crucial design consideration and cannot always be compensated by a phase-locked loop especially when low-gain, multiband oscillators are employed. A ring oscillator architecture with reduced frequency drift over temperature is presented in this paper. The oscillator is incorporated in a phase locked loop (PLL) to produce a stable clock within the required frequency range under process, voltage, and temperature variations. The output frequency of the oscillator is compensated through a proportional to absolute temperature (PTAT) current in order to eliminate the frequency drift. A proof-of-concept PLL has been designed and fabricated in a 180 nm CMOS technology operating with 3.3 V supply voltage and providing a 480 MHz frequency. Measurement results of the fabricated chip show a frequency variation of the VCO from-1.5 % to + 0.4 % from the center frequency across the temperature range from-40 ? to 120 ? meeting the requirements for most consumer market applications. The duty cycle distortion is less than 1% across the temperature range. The phase noise of the oscillator was measured at-107 dBc/Hz.
Keyword:
Ring oscillator
Temperature compensation
Voltage-controlled oscillator
期刊
A
IF:
3.2
论文数:
5.8K
被引数:
8.3K
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