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This paper presents a CMOS 1.8 V–0.18 μm quadrature sinusoidal oscillator designed for its application as the actuation system in portable frequency-domain sensing devices, such as impedance spectroscopy or resonant readout systems. It is based on an analog implementation, to preserve low-voltage low-power operation with a compact topology. The oscillation frequency can be digitally set by a novel...
This paper presents a capacitive-discharging oscillator architecture that achieves ultra-low-power operation without a temperature-stabilized reference generator by directly relying on the RC time constants of capacitors discharging across passively-temperature-stabilized resistive elements. The architecture operates by pre-charging two capacitors to the supply voltage, and then discharging one of...
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