Stable watch time base having two frequency oscillators providing reference and frequency derivator comparing signal/reference dividing signal forming temperature stable reference time

摘要

The time base architecture has first and second oscillators (OSC1,OSC2) oscillating at different frequencies. A difference signal is generated. There is a frequency derivative unit (CTRL) comparing the signal from the first oscillator with a reference. A programmable correction (DIVI) divides the signal from the first oscillator forming a temperature stable reference time (RTC).