CPC A61B 5/14532 (2013.01) [A61B 5/0002 (2013.01)] | 10 Claims |
1. A method for providing a variable reference voltage to an input of an operational amplifier, comprising:
calculating a PWM/PDM signal to generate a target reference voltage using an RC network;
connecting a PWM/PDM generator to the RC network and applying the calculated PWM/PDM signal to generate a reference voltage;
waiting for the reference voltage to settle;
measuring the reference voltage and comparing the measured voltage to the target reference voltage;
adjusting the PWM/PDM signal until a measured voltage of the reference voltage is at the target reference voltage;
turning off and disconnecting the PWM/PDM generator from the RC network; and
waiting a period of time in a low power state.
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