Switched capacitor circuitry and sub-ranging ADC
AssigneeInfineon Technologies Austria AG
InventorsSujata Sen, Luca Petruzzi
Life of this patent
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Abstract
An apparatus as discussed herein can be configured to include a first analog-to-digital converter operative to convert a first analog voltage into a first digital signal; a digital-to-analog converter operative to convert the first digital signal into a second analog voltage; a switched capacitor circuit coupled to the digital-to-analog converter, the switched capacitor circuit is operative to store a sample of the second analog voltage; and a second analog-to-digital converter operative to convert an analog error voltage into a second digital signal, the analog error voltage based on a difference between the sample of the second analog voltage received from the switched capacitor circuit and a sample of the first analog voltage.
Claims24
An apparatus comprising:
- a switched capacitor circuit including multiple switches and multiple capacitors;
- a controller operative to, via control of the multiple switches:
- i) store a sample of an analog input voltage in a first capacitor of the multiple capacitors, the analog input voltage inputted to a first analog-to-digital converter circuit;
- ii) store a sample of a first reference voltage associated with the first analog-to-digital converter circuit in a second capacitor of the multiple capacitors;
- and iii) derive an analog error voltage from the sample of the analog input voltage and the sample of the first reference voltage;
- and
- wherein the first reference voltage is selected from amongst multiple reference voltage for storage in the second capacitor depending on a magnitude of the analog input voltage.
An apparatus comprising:
- a first analog-to-digital converter operative to convert a first analog voltage into a first digital signal;
- a digital-to-analog converter operative to convert the first digital signal into a second analog voltage;
- a switched capacitor circuit coupled to the digital-to-analog converter, the switched capacitor circuit operative to store a sample of the second analog voltage;
- and
- a second analog-to-digital converter operative to convert an analog error voltage into a second digital signal, the analog error voltage generated based on a difference between the sample of the second analog voltage received from the switched capacitor circuit and a sample of the first analog voltage.
A method comprising:
- storing a sample of an analog input voltage in a first capacitor of a switched capacitor circuit including multiple switches and multiple capacitors, the analog input voltage inputted to a first analog-to-digital converter circuit;
- storing a sample of a first reference voltage associated with the first analog-to-digital converter circuit in a second capacitor of the multiple capacitors, the first reference voltage being one of multiple reference voltages associated with the first analog-to-digital converter circuit;
- and
- deriving an analog error voltage from the sample of the analog input voltage and the sample of the first reference voltage.
An apparatus comprising:
- a switched capacitor circuit including multiple switches and multiple capacitors;
- a controller operative to, via control of the multiple switches:
- i) store a sample of an analog input voltage in a first capacitor of the multiple capacitors, the analog input voltage inputted to a first analog-to-digital converter circuit;
- ii) store a sample of a first reference voltage associated with the first analog-to-digital converter circuit in a second capacitor of the multiple capacitors;
- and iii) derive an analog error voltage from the sample of the analog input voltage and the sample of the first reference voltage;
- a second analog-to-digital converter circuit;
- and
- wherein the switched capacitor circuit is operative to output the analog error voltage to the second analog-to-digital converter circuit.
Dependencies are inferred from the claim text.