Abstract
An RC relaxation oscillator (ROSC) with hybrid temperature compensation as well as the frequency of 2 MHz is proposed in this paper. Frequency stability is enhanced with analog compensation by replicating the path of comparator and level determination logic (LDL), the compensation approach removes the temperature-dependent delay of the comparator and LDL. Since frequency is undesirable at low temperatures (below 0 °C) due to non-zero-temperature-coefficient current and voltage references, as well as weak carrier mobility, digital low temperature compensation is presented to extend the oscillator’s operating temperature range to −40 °C–125 °C. The digital compensation module, after hybrid compensation, is then utilized for real-time oscillator calibration by the same operating principle. The presented oscillator with hybrid compensation and real-time calibration is developed in a standard 0.18-μm CMOS process with the active area of 0.04 mm2, and post-simulation results reveal that after hybrid compensation, the temperature coefficient (TC) of this oscillator is 43.97 ppm/°C in the temperature range of −40 °C–125 °C. The power of this ROSC is 185 μW when the supply voltage is 1.8V.
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