Relaxation oscillator that samples voltage difference between voltages generated by resistor-capacitor charging and discharging for controlling output clock frequency of controllable oscillator and associated relaxation oscillation method
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United States of America Patent
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Feb 14, 2023
Grant Date -
Nov 10, 2022
app pub date -
Nov 14, 2021
filing date -
May 7, 2021
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Abstract
A relaxation oscillator includes a resistor-capacitor (RC) circuit, an integration capacitor, a sampling circuit, and a controllable oscillator. The RC circuit performs an RC charging operation to set a first voltage, performs an RC discharging operation to set a second voltage, and performs a reset operation to reset the first voltage to a first reference voltage and reset the second voltage to a second reference voltage. The sampling circuit performs a charge delivery operation to sample a voltage difference between the first voltage and the second voltage, and transfers the voltage difference to the integration capacitor. The controllable oscillator generates an output clock in response to a control input provided by the integration capacitor.
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