Diagnostic monitoring for analog-to-digital converters

A channel selector for use in an analog-to-digital converter having a sampling circuit configured to convert an analog input to a digital output within a fault tolerance range, the channel selector comprising:

• a reception channel having a first channel impedance;
• a first switch coupled between the reception channel and the sampling circuit;
• a diagnostic channel coupled with the sampling circuit;
• a second switch coupled between the diagnostic channel and the sampling circuit;
• and
• an impedance compensator configured to offset the first channel impedance of the reception channel based on the fault tolerance range of the sampling circuit and when the diagnostic channel is selectively coupled to the sampling circuit.

A method for verifying a digital output of an analog-to-digital converter (ADC) having a channel selector configured to select a channel for providing an analog input, and a sampling circuit configured to convert the analog input to the digital output, the method comprising:

• isolating the sampling circuit from the selected channel during a first time period;
• resetting the sampling circuit during a second time period partially overlapping with the first time period;
• and
• coupling the sampling circuit with the channel selector during a third time period after the second time period and outside of the first time period.

A device for verifying a digital output of an analog-to-digital converter (ADC), the device comprising:

• means for isolating a sampling circuit from a selected channel during a first time period;
• means for resetting the sampling circuit during a second time period partially overlapping with the first time period;
• and
• means for coupling the sampling circuit with a channel selector during a third time period after the second time period and outside of the first time period.