| CPC H03M 1/1057 (2013.01) [H02M 1/0025 (2021.05); H03M 1/785 (2013.01)] | 15 Claims |
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1. A DC-DC converter system, comprising:
a reference buffer configured to buffer a reference input signal at its input to produce a digital-to-analog conversion reference signal at its output, and operating based upon a reference feedback voltage generated by a reference resistive divider;
a tail buffer configured to generate a tail voltage based upon an input voltage generated from the digital-to-analog conversion reference signal by a tail resistive divider;
a R-2R type digital to analog converter (DAC) configured to utilize a R-2R resistive ladder to generate a DAC output voltage at a DAC output based upon an input code, the R-2R resistive ladder having a tail resistor coupled to the tail voltage;
a feedback buffer configured to buffer the DAC output voltage to produce a converter reference voltage;
a DC-DC converter configured to generate a DC output voltage at a DC output node from a DC input voltage at a DC input node, based upon a converter feedback voltage;
a feedback resistive divider coupled between the DC output node and the converter reference voltage, with the converter feedback voltage being generated at a tap of the feedback resistive divider; and
control circuitry configured to:
selectively tap the reference resistive divider to produce the reference feedback voltage, thereby performing gain trimming of the DC output voltage; and
selectively tap the tail resistive divider to produce the input voltage for the tail buffer, thereby performing offset trimming of the DC output voltage.
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