Key result
A 1-9 GHz linear-wide-tuning-range quadrature ring oscillator demonstrated a linear tuning range from 1 GHz to 9 GHz with advantages in low power consumption compared to other designs.
Describes a 1-9 GHz quadrature ring oscillator designed for non-contact vital sign radar sensors with low power consumption and linear tuning.
May enable low-power non-contact vital sign radar in cardiology; leaves open prospective clinical validation.
A 1-9 GHz linear-wide-tuning-range quadrature ring oscillator has been designed and fabricated in UMC 0.13 ¿m CMOS process. The chip was wire-bonded on printed circuit board and tested, showing a liner tuning range from 1 GHz to 9 GHz. Comparative study with other differential ring oscillators demonstrates the advantages of this design in low power consumption and linear-tuning. The oscillator was designed as the voltage controlled oscillator (VCO) for a non-contact vital sign radar sensor. It can also be used for other applications such as ultra-wideband (UWB) impulse radio and clock recovery in broadband optical communications.
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Li et al. (2009) studied this question. 1-9 GHz linear-wide-tuning-range quadrature ring oscillator vs. Other differential ring oscillators was evaluated on Linear tuning range and power consumption. A 1-9 GHz linear-wide-tuning-range quadrature ring oscillator demonstrated a linear tuning range from 1 GHz to 9 GHz with advantages in low power consumption compared to other designs.
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