Utilizing multiple analog-to-digital converters in a conversion circuit

A method, comprising:

• converting, using a first analog-to-digital converter (ADC), an analog voltage to generate a first subset of digital output bits from a most significant bit (MSB) to a bit k and then generating a second subset of digital output bits from a bit k−1 to a least significant bit (LSB) of the first ADC, the bit k being between the MSB and the LSB of the first ADC;
• outputting, from the first ADC, a residual voltage of the analog voltage after conversion of the bit k;
• amplifying, using an amplifier stage, the residual voltage to generate an amplified residual voltage at an output of the amplifier stage;
• preloading one or more higher resolution bits of a second ADC with logical zeros, the second ADC being implemented using a same circuit design as the first ADC;
• and
• converting, using the second ADC, the amplified residual voltage at the output of the amplifier stage to generate extra digital output bits, wherein the extra digital output bits and the second subset of digital output bits comprise overlapping information relating to the residual voltage.

A device, comprising:

• a conversion circuit, comprising:
• a first analog-to-digital converter (ADC) comprising a first digital-to-analog converter (DAC) that outputs Vdacn, a second DAC that outputs Vdacp based at least upon an analog voltage, a comparator connected to the first DAC and the second DAC, and a residual output, the first ADC configured to determine, from an output of the comparator, a first subset of digital output bits from a most significant bit (MSB) to a bit k and then a second subset of digital output bits from a bit k−1 to a least significant bit (LSB) of the first ADC, the bit k being between the MSB and the LSB of the first ADC, the residual output being configured to output a residual voltage comprising Vdacn and Vdacp after converting the bit k;
• an amplifier stage connected to the residual output of the first ADC and configured to generate an amplified residual voltage at an output of the amplifier stage;
• and
• a second ADC connected to the output of the amplifier stage, the second ADC configured to convert the amplified residual voltage at the output of the amplifier stage to generate extra digital output bits, wherein the extra digital output bits and the second subset of digital output bits comprise overlapping information relating to the residual voltage.