Current injection for fast ramp start-up during analog-to-digital operations

A method, comprising:

• opening, in response to a first control signal, a feedback bypass switch coupled to an amplifier to initiate an analog-to-digital conversion (ADC) operation;
• providing, by a current injection circuit, an injection current pulse to an inverting input of the amplifier, wherein the non-inverting input is coupled to the feedback bypass switch;
• integrating a first reference current coupled to the inverting input of the amplifier, wherein the integrating of the first reference current occurs due to the opening of the feedback bypass switch;
• and
• providing, by the amplifier, a reference voltage in response to the injection current pulse, the integrating of the first reference current, and a reference voltage coupled to a non-inverting input of the amplifier,
• wherein a level of the reference voltage is increased at least at initiation of the ADC operation at least in response to the injection current pulse.