Real time clock (RTC) voltage regulator and method of regulating an RTC voltage
AssigneeTexas Instruments Incorporated
InventorsMohammad A. Al-Shyoukh, Marcus M. Martins
Life of this patent
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Abstract
A real time clock (RTC) voltage regulator, a method of regulating an RTC voltage and a power management integrated circuit (PMIC). In one embodiment, an RTC voltage regulator includes a current source configured to provide a first current and a voltage regulator having a common gate amplifier and a power device. The first current is employed to establish a reference voltage for the common gate amplifier and the common gate amplifier is configured to control the power device. The power device is configured to provide an RTC voltage for the common gate amplifier.
Claims14
A real time clock (RTC) voltage regulator comprising:
- a current source that provides a first current;
- and
- a voltage regulator having:
- a common gate amplifier having first and second MOS transistors, wherein each of the first and second MOS transistors is coupled to the current source, and wherein the first MOS transistors receives the first current, and wherein the first current establishes a reference voltage for the common gate amplifier;
- a power device that is coupled to the second MOS transistor and that is controlled by the common gate amplifier, wherein the power device provides an RTC voltage for the common gate amplifier.
A power management integrated circuit (PMIC) comprising:
- an input node configured to receive an operating voltage from a battery;
- and
- a real time clock (RTC) voltage regulator including:
- a current source that provides a first current;
- and
- a voltage regulator having:
- a common gate amplifier having first and second MOS transistors, wherein each of the first and second MOS transistors is coupled to the current source, and wherein the first MOS transistors receives the first current, and wherein the first current establishes a reference voltage for the common gate amplifier;
- a power device that is coupled to the second MOS transistor and that is controlled by the common gate amplifier, wherein the power device provides an RTC voltage for the common gate amplifier.
An apparatus comprising:
- a bandgap voltage generator;
- and
- a real time clock (RTC) voltage regulator having:
- a current source that is coupled to the bandgap voltage source;
- a first MOS transistor that is coupled to the current source at its gate and its drain, wherein the first MOS transistor is diode-connected;
- a second MOS transistor that is coupled to the gate of the first MOS transistor at its gate and the current source at its drain;
- and
- a third MOS transistor that is coupled to the drain of the second MOS transistor at its gate and that outputs a reference voltage at its drain.
Dependencies are inferred from the claim text.