Methods of filtering reference voltage noise

A circuit comprising:

• a converter that receives an input voltage at an input terminal and compares the input voltage to a voltage reference received at a reference terminal from a voltage reference circuit;
• a resistor connected at a first end to the voltage reference circuit and at a second end to the reference terminal of the converter;
• and
• reference gain trimming means for compensating an output of the converter to adjust for a gain error caused by voltage drop across the resistor by multiplying an output of the converter by a scaling factor having a value selected to compensate the gain error caused by voltage drop across the resistor upon application of the voltage reference to the first end of the resistor.

A method comprising:

• receiving an input voltage at an input terminal of a circuit;
• comparing the input voltage to a voltage reference received at a reference terminal of the circuit from a voltage reference circuit;
• and
• compensating gain error due to voltage drop across a resistor connected at a first end to the voltage reference circuit and at a second end to the reference terminal of the circuit by multiplying an output of the circuit by a scaling factor having a value selected to compensate a gain error caused by voltage drop across the resistor upon application of the voltage reference to the first end of the resistor.