Power-up calibration of charge redistribution analog-to-digital converter

An analog/digital converter integrated circuit, comprising:

• an analog/digital converter circuit having a power supply input port, an analog signal port, and a digital data port, wherein the analog/digital converter circuit is a charge-redistribution analog-to-digital converter, wherein the analog signal port is an analog input pin, and wherein the digital data port is a digital data output port,
• a calibration circuit having a calibration initiation control input and being operatively connected to the analog/digital converter circuit, and
• a power-up delay circuit operatively connected to the initiation control input of the calibration circuit.

An analog/digital converter integrated circuit, comprising:

• an analog/digital converter circuit having a power supply input port, an analog signal port, and a digital data port,
• a calibration circuit having a calibration initiation control input and being operatively connected to the analog/digital converter circuit, and
• a power-up delay circuit operatively connected to the initiation control input of the calibration circuit, wherein the calibration circuit includes status outputs operatively connected to the power-up delay circuit.

An analog/digital converter integrated circuit, comprising:

• an analog/digital converter circuit having a power supply input port, analog signal port, and a digital data port,
• a calibration circuit having a calibration initiation control input and being operatively connected to the analog/digital converter circuit, and
• a power-up delay circuit operatively connected to the initiation control input of the calibration circuit, wherein the power-up delay circuit is constructed and adapted to operate without any external calibration pin on the integrated circuit.

A method of calibrating an analog/digital converter integrated circuit, comprising:

• providing power to the analog/digital converter integrated circuit from an external power supply to a power pin on the analog/digital converter integrated circuit,
• generating a delayed signal, said signal being delayed from the occurrence of the step of providing power from the external power supply to the power pin on the analog/digital converter integrated circuit by a power-up delay circuit on the integrated circuit, and
• initiating by a calibration circuit on the integrated circuit a calibration of an analog/digital converter on the integrated circuit upon detecting the delayed signal generated in the generating step.

A method of calibrating an analog/digital converter integrated circuit, comprising:

• providing power to the analog/digital converter integrated circuit,
• generating a delayed signal, said signal being delayed from the occurrence of the step of providing power by a power-up delay circuit on the integrated circuit, wherein the step of generating a delayed signal generates the delayed signal with a delay that is nominally less than about 30 milliseconds in length, and
• initiating a calibration of the analog/digital converter upon detecting the delayed signal generated in the generating step.

A method of calibrating an analog/digital converter integrated circuit, comprising:

• providing power to the analog/digital converter integrated circuit,
• generating a delayed signal, said signal being delayed from the occurrence of the step of providing power by a power-up delay circuit on the integrated circuit, wherein the step of generating a delayed signal derives the duration of a delay of the delayed signal from a duration of a calibration operation, and
• initiating a calibration of the analog/digital converter upon detecting the delayed signal generated in the generating step.

A method of calibrating an analog/digital converter integrated circuit, comprising:

• providing power to the analog/digital converter integrated circuit,
• generating a delayed signal, said signal being delayed from the occurrence of the step of providing power by a power-up delay circuit on the integrated circuit, wherein the step of generating a delayed signal includes a step of charging a capacitor external to the integrated circuit, and wherein the step of generating the delayed signal derives the duration of a delay of the delayed signal from the charging step, and
• initiating a calibration of the analog/digital converter upon detecting the delayed signal generated in the generating step.

A method of calibrating an analog/digital converter integrated circuit, comprising:

• providing power to the analog/digital converter integrated circuit,
• generating a delayed signal, said signal being delayed from the occurrence of the step of providing power by a power-up delay circuit on the integrated circuit, and
• initiating a calibration of the analog/digital converter upon detecting the delayed signal generated in the generating step, wherein the calibration initiated in the step of initiating a calibration of the converter includes the step of adjusting the capacitance of a capacitor in the converter using a switched array of capacitors.

A circuit for calibrating an analog/digital converter integrated circuit, comprising:

• power supply pin means for providing power from an external power supply to the analog/digital converter integrated circuit,
• power-up delay means responsive to the power supply pin means on the integrated circuit for generating a signal delayed from power-up of the integrated circuit, and
• means on the integrated circuit and responsive to the power supply pin means and to the power-up delay means for initiating a calibration of the analog/digital converter upon detecting the delayed signal.

A circuit for calibrating an analog/digital converter integrated circuit, comprising:

• means for providing power to the analog/digital converter integrated circuit,
• power-up delay means on the integrated circuit for generating a signal delayed from power-up of the integrated circuit, and
• means responsive to the power-up delay means for initiating a calibration of the analog/digital converter upon detecting the delayed signal, wherein the means for initiating a calibration further includes means for initiating a calibration in response to a signal external to the integrated circuit on a calibration input pin of the integrated circuit.

A circuit for calibrating an analog/digital converter integrated circuit, comprising:

• means for providing power to the analog/digital converter integrated circuit,
• power-up delay means on the integrated circuit for generating a signal delayed from power-up of the integrated circuit, wherein the power-up delay means includes means for deriving the duration of a delay of the signal from a duration of a calibration operation, and
• means responsive to the power-up delay means for initiating a calibration of the analog/digital converter upon detecting the delayed signal.

A circuit for calibrating an analog/digital converter integrated circuit, comprising:

• means for providing power to the analog/digital converter integrated circuit,
• power-up delay means on the integrated circuit for generating a signal delayed from power-up of the integrated circuit, wherein the power-up delay means includes means for charging a capacitor external to the integrated circuit, and wherein the power-up delay means includes means for deriving the duration of a delay of the delayed signal from the means for charging, and
• means responsive to the power-up delay means for initiating a calibration of the analog/digital converter upon detecting the delayed signal.