An On-Chip Oscillator with Comparator Offset Cancellation

This work presents an on-chip oscillator with offset cancellation in $0.25~\mu \mathrm {m}$ process. By automatically choosing the reference voltage in a single comparator, the proposed oscillator can perfectly achieve offset cancellation. In addition, it reduces the comparator count from two to one for area-saving and power-saving. The simulation results exhiUit a Temperature Coefficient of 2.3 ppm/oC from -40 to $90~^{\circ} \mathrm {c}$ while consuming $6.5~\mu W$ at 30 kHz.