A Fully Integrated 16-MHz Voltage-Mode Relaxation Oscillator With Current Calibration for Temperature Compensation

초록

This brief presents a fully integrated 16-MHz on-chip voltage-mode relaxation oscillator that employs a current calibration technique for temperature. Fabricated in a 130nm CMOS process, the prototype occupies only 0.048mm(2 )of active area. The proposed calibration method leverages an on-chip bandgap reference to stabilize the oscillator's reference current and control voltage against temperature variations. With calibration enabled, the oscillator's temperature coefficient is reduced from 405.83 ppm/degrees C to 93.83 ppm/degrees C, with an average of 77.32 ppm/degrees C measured from- 40 degrees C to 80 degrees C, demonstrating significantly improved frequency stability. Operating at 16 MHz, the design consumes 60 mu W, corresponding to a power efficiency figure of merit (FoM( 1 )) of 3.75 mu W/MHz, and achieves a phase noise FoM (FoM( 2 )) of-142.3 dBc/Hz. These results confirm that the proposed oscillator provides a compact, low-power clock source with excellent temperature stability.

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