System reference with compensation of electrical and mechanical stress and life-time drift effects
Stress compensated systems and methods of compensating for electrical and mechanical stress are discussed. One example system can include a first circuit and a global stress compensation component. The first circuit can be configured to generate a first signal and can comprise at least one local stress compensation component (e.g., employing dynamic element matching, chopping, etc.). The global stress compensation component can comprise one or more stress sensors configured to sense one or more stress components associated with the system. The global stress compensation component can be configured to receive the first signal and to compensate for stress effects on the first signal.
1. A method, comprising:
generating at least one reference signal via a reference circuit, wherein generating the reference voltage comprises compensating, via the reference circuit, for stress effects shown via the at least one reference signal, wherein the at least one reference signal comprises at least one of a reference voltage, a reference current, or a reference clock frequency;
sensing at least one stress component of a system comprising the reference circuit via at least one stress sensor, wherein each stress component of the at least one stress component of the system is one of a component of a stress tensor of the system or a linear combination of components of the stress tensor of the system; and
compensating for the stress effects shown via the at least one reference signal based on the sensed at least one stress component.
2. The method of claim 1 , wherein compensating, via the reference circuit, for the stress effects shown via the at least one reference signal comprises employing dynamic element matching (DEM) to cycle between at least one of a plurality of transistors of the reference circuit or a plurality of resistors of the reference circuit.
3. The method of claim 1 , wherein compensating, via the reference circuit, for the stress effects shown via the at least one reference signal comprises chopping or auto-zeroing at least one of an input signal of an amplifier of the reference circuit or an output signal of the amplifier of the reference circuit.
4. The method of claim 1 , wherein sensing at least one stress component comprises sensing at least two distinct stress components, and wherein compensating for the stress effects shown via the at least one reference signal based on the sensed at least one stress component comprises compensating for the stress effects shown via the at least one reference signal based on the sensed at least two distinct stress components.
5. The method of claim 1 , wherein the at least one stress sensor comprises a plurality of stress sensors, and further comprising employing dynamic element matching (DEM) to cycle between the plurality of stress sensors to compensate for stress effects on the plurality of stress sensors.
6. The method of claim 1 , wherein the reference circuit comprises at least one of an amplifier or an analog-to-digital converter (ADC), and the sensing is performed using an auto-zeroing component or a chopper, further comprising eliminating an offset of an input signal or an output signal of the amplifier or the ADC using the auto-zeroing component or the chopper.
7. The method of claim 1 , wherein the at least one stress sensor comprises a plurality of stress sensors, and wherein sensing at least one stress component comprises sensing a plurality of distinct stress components, respectively.
8. The method of claim 1 , wherein the at least one stress sensor comprises a temperature sensor configured to sense at least one temperature, and wherein compensating for the stress effects comprises compensating for temperature effects shown via the at least one reference signal based at least in part on the sensed at least one temperature.
9. The method of claim 1 , wherein compensating is performed with a stress compensation component that comprises a sensor analog-to-digital converter (ADC) that measures the at least one stress component based on the sensed at least one stress component.
10. The method of claim 9 , wherein compensating is further performed with a set of local stress compensation components, wherein the set of local stress compensation components comprises at least one of an sensor ADC auto-zeroing component or a sensor ADC chopper, wherein the sensor ADC auto-zeroing component or the sensor ADC chopper is configured to eliminate an offset of an input signal or an output signal of the sensor ADC.
11. The method of claim 9 , wherein compensating is further performed with a compensation digital-to-analog converter (DAC) configured to receive an output signal from the sensor ADC, and configured to generate a compensation output signal, and is further configured to compensate for the stress effects on the at least one reference signal based at least in part on adjusting the reference voltage based on the compensation output signal.