Circuit and method for generating a reference voltage with a voltage regulator and a sample and hold circuit

A system comprising:

• a sensor operable to transmit sensed data, wherein the sensor is operable to have a first period where transmission of the sensed data is enabled and a second period where transmission of the sensed data is disabled;
• a voltage regulator operable to:
• receive a supply voltage;
• and
• provide a first output voltage;
• a sample-and-hold circuit coupled to the voltage regulator and operable to:
• provide a second output voltage based on the first output voltage;
• and
• a control circuit coupled to the voltage regulator and to the sample-and-hold circuit and operable to provide an enable signal to the voltage regulator, wherein the enable signal is configured such that a portion of the voltage regulator is enabled during the first period where transmission of the sensed data is enabled and disabled during the second period where transmission of the sensed data is disabled.

A method comprising:

• receiving, by a voltage regulator, a supply voltage;
• providing, by the voltage regulator, a first output voltage based on the supply voltage;
• sampling, by a sample-and-hold circuit, the first output voltage to provide a second output voltage;
• and
• disabling a portion of the voltage regulator based on a transmit duty cycle of a sensor such that the voltage regulator is disabled when a transmit capability of the sensor is disabled.