CPC H03K 3/011 (2013.01) [G06F 1/06 (2013.01); H03K 3/017 (2013.01); H03K 5/24 (2013.01)] | 34 Claims |
1. An analog calibration (ACAL) circuit, comprising:
a programmable voltage reference generation circuit configured to:
generate a step reference voltage among a plurality of programmable step reference voltages based on a supply voltage and a reference voltage programming selection selected by a reference voltage selection circuit;
the ACAL circuit configured to generate an input reference voltage based on the selected step reference voltage;
further comprising:
a comparator circuit configured to:
compare the input reference voltage to an input circuit voltage from a measured circuit; and
generate a digital measurement signal based on a difference between the input reference voltage and the input circuit voltage; and
the ACAL circuit further configured to:
determine if the input reference voltage is greater than the input circuit voltage based on the digital measurement signal; and
in response to the digital measurement signal indicating the input reference voltage is greater than the input circuit voltage:
generate a next step reference voltage among the plurality of programmable step reference voltages based on the supply voltage and a next reference voltage programming selection; and
generate the input reference voltage based on the next selected step reference voltage.
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