Switched-Capacitor RCO Calibration Without Comparators or PLLs

The patent removes the comparator from the oscillator circuit, extracting the harmful element that causes excessive power consumption and large IC area. The frequency calibration function is then achieved through digital frequency calibration without requiring a comparator, thus resolving the contradiction between precision and power consumption.

The patent replaces the analog comparator-based frequency calibration mechanism with a digital frequency calibration system. This substitution eliminates the need for large resistor-capacitor arrays and comparators, reducing both power consumption and IC area while maintaining frequency calibration precision.

The patent extracts and removes the phase locked loop from the oscillator system, eliminating the need for large IC footprint. Frequency calibration precision is maintained through digital frequency calibration methods that do not require the complex phase locked loop architecture.

The patent uses digital frequency calibration as a simplified copy or alternative to the phase locked loop function. Instead of implementing the full phase locked loop mechanism, a digital calibration system replicates the frequency adjustment capability with significantly reduced hardware requirements.

The patent replaces the comparator-based high-frequency operation mechanism with a switched capacitor-based system. This substitution enables high-frequency operation with reduced power consumption by eliminating the continuous operation of comparators and using periodic switching instead.

The patent employs periodic switching of capacitors to achieve high-frequency operation. Instead of continuous comparator operation that consumes power, the system uses periodic charge transfer and switching actions to generate high-frequency clocks with lower power consumption.