Analog to digital converter with dual integrating capacitor systems
First Claim
1. An apparatus comprising:
- a first capacitor system and a second capacitor system, each capacitor system comprising one or more capacitors, each capacitor system removably coupled to the same portion of an analog to digital converter (ADC) and the same sensing circuit, each capacitor system configured to store an amount of charge received through the sensing circuit when coupled to the sensing circuit, and provide the amount of charge received through the sensing circuit to the ADC for conversion into a digital value when coupled to the portion of the ADC;
a timing circuit configured to generate one or more control signals; and
a switching circuit configured to;
receive the one or more control signals;
when the one or more control signals are in a first state, couple the first capacitor system to the sensing circuit to receive charge through the sensing circuit and concurrently couple the second capacitor system to the portion of the ADC; and
when the one or more control signals are in a second state, couple the second capacitor system to the sensing circuit to receive charge through the sensing circuit and concurrently couple the first capacitor system to the portion of the ADC.
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Accused Products
Abstract
In one embodiment, an apparatus comprises a first capacitor system and a second capacitor system. Each capacitor system is removably coupled to the same portion of an analog to digital converter (ADC) and the same sensing circuit. Each capacitor system stores charge received through the sensing circuit when coupled to the sensing circuit and provides the charge received through the sensing circuit to the ADC for conversion into a digital value when coupled to the ADC. When the control signals are in a first state, the first capacitor system receives charge through the sensing circuit and the second capacitor system is coupled to the portion of the ADC. When the one or more control signals are in a second state, the second capacitor system is coupled to the sensing circuit to receive charge through the sensing circuit and the first capacitor system is coupled to the portion of the ADC.
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Citations
21 Claims
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1. An apparatus comprising:
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a first capacitor system and a second capacitor system, each capacitor system comprising one or more capacitors, each capacitor system removably coupled to the same portion of an analog to digital converter (ADC) and the same sensing circuit, each capacitor system configured to store an amount of charge received through the sensing circuit when coupled to the sensing circuit, and provide the amount of charge received through the sensing circuit to the ADC for conversion into a digital value when coupled to the portion of the ADC; a timing circuit configured to generate one or more control signals; and a switching circuit configured to; receive the one or more control signals; when the one or more control signals are in a first state, couple the first capacitor system to the sensing circuit to receive charge through the sensing circuit and concurrently couple the second capacitor system to the portion of the ADC; and when the one or more control signals are in a second state, couple the second capacitor system to the sensing circuit to receive charge through the sensing circuit and concurrently couple the first capacitor system to the portion of the ADC. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method comprising:
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generating one or more control signals; when the one or more control signals are in a first state; coupling a first capacitor system comprising one or more capacitors to a sensing circuit; coupling a second capacitor system comprising one or more capacitors to a portion of an analog to digital converter (ADC); storing, by the first capacitor system, a first amount of charge received through the sensing circuit; providing, by the second capacitor system, a second amount of charge to the ADC for conversion into a first digital value; and when the one or more control signals are in a second state; coupling the second capacitor system to the sensing circuit; coupling the first capacitor system to the portion of the ADC; storing, by the second capacitor system, a third amount of charge received through the sensing circuit; and providing, by the first capacitor system, the first amount of charge to the ADC for conversion into a second digital value. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An apparatus, comprising:
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a capacitive touch sensor comprising a plurality of nodes; and a control unit coupled to the capacitive touch sensor, the control unit comprising; a first capacitor system and a second capacitor system, each capacitor system comprising one or more capacitors, each capacitor system removably coupled to the same portion of an analog to digital converter (ADC) and at least one node of the capacitive touch sensor, each capacitor system configured to store an amount of charge received through the at least one node when coupled to the at least one node, and provide the amount of charge received through the at least one node to the ADC for conversion into a digital value when coupled to the ADC; a timing circuit configured to generate one or more control signals; and a switching circuit configured to; receive the one or more control signals; when the one or more control signals are in a first state, couple the first capacitor system to the at least one node to receive charge through the at least one node and concurrently couple the second capacitor system to the portion of the ADC; and when the one or more control signals are in a second state, couple the second capacitor system to the at least one node to receive charge through the at least one node and concurrently couple the first capacitor system to the portion of the ADC. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification