US 11,850,046 B2
System and apparatus for enabling low power wireless devices
Robert Bruce Ganton, San Diego, CA (US); and Robert S Ballam, Eaton Hill (CA)
Filed by Robert Bruce Ganton, San Diego, CA (US); and Robert S Ballam, Eaton Hill (CA)
Filed on Feb. 27, 2021, as Appl. No. 17/187,798.
Claims priority of provisional application 62/982,468, filed on Feb. 27, 2020.
Prior Publication US 2022/0007974 A1, Jan. 13, 2022
Int. Cl. H03F 3/45 (2006.01); A61B 5/145 (2006.01); A61B 5/00 (2006.01)
CPC A61B 5/14532 (2013.01) [A61B 5/0002 (2013.01)] 10 Claims
OG exemplary drawing
 
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.