Automatic voltage control circuit and method thereof
AssigneeRealtek Semiconductor Corp.
InventorsMeng-Han Hsieh, Chi-Shun Weng
Life of this patent
Estimating the term…
Abstract
An automatic voltage control circuit controls a power supply unit to adjust a supply voltage provided by the power supply unit. The automatic voltage control circuit includes an oscillating unit, a frequency-comparing unit, and a control unit. The oscillating unit generates an oscillating signal. The frequency-comparing unit compares the oscillating frequency of the oscillating signal with at least one predetermined threshold frequency. The control unit controls the power supply unit to adjust the supply voltage according to the comparing result generated by the frequency-comparing unit.
Claims10
An automatic voltage control circuit for controlling a power supply unit to adjust a supply voltage provided by the power supply unit, comprising:
- a ring oscillator, coupled to the power supply unit, for generating an oscillating signal, wherein the ring oscillator comprises a plurality of inverters, and at least one of the inverters comprises a NOR gate or a NAND gate;
- a frequency-comparing unit, coupled to the oscillating unit, for comparing an oscillating frequency of the oscillating signal with at least one predetermined threshold frequency to generate a comparison result;
- and
- a control unit, coupled to the frequency-comparing unit and the power supply unit, for controlling the power supply unit to adjust the supply voltage according to the comparison result.
An automatic voltage control circuit for controlling a power supply unit to adjust a supply voltage provided by the power supply unit, comprising:
- a plurality of ring oscillators, coupled to the power supply unit, for generating a plurality of oscillating signals, wherein each ring oscillator comprises a plurality of inverters, and at least one of the inverters comprise a NOR gate or a NAND gate;
- a plurality of frequency-comparing units, each of the plurality of frequency-comparing units respectively coupled to one of the oscillating units, for comparing an oscillating frequency of the each oscillating signal with at least one corresponding predetermined threshold frequency to generate a comparison result;
- and
- at least one control unit, coupled to the frequency-comparing units and the power supply unit, for controlling the power supply unit to adjust the supply voltage according to the comparison result.
Dependencies are inferred from the claim text.