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US 11,901,910 B2Granted
Successive approximation register analog to digital converter
AssigneeTexas Instruments Incorporated
InventorsKrishnaswamy Nagaraj, Joonsung Park
Life of this patent
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Abstract
A successive approximation analog-to-digital with an input for receiving an input analog voltage, and an amplifier with a first set of electrical attributes in a sample phase and a second set of electrical attributes, differing from the first set of electrical attributes, in a conversion phase.
Claims20
A circuit device comprising:
- a comparator that includes:
- a transconductor that includes an input configured to couple to a sampling capacitor and includes an output;
- a switch coupled to the output of the transconductor;
- a first capacitor coupled to the switch and to a ground node;
- a second capacitor coupled to the output of the transconductor;
- a resistor coupled to the output of the transconductor and the ground node;
- and
- a level detector that includes an input coupled to the second capacitor.
5 more elements
A circuit device comprising:
- a voltage input configured to receive an input voltage;
- a digital-to-analog converter configured to provide a reference voltage;
- a register coupled to the digital-to-analog converter;
- a first switch coupled to the voltage input and the digital-to-analog converter;
- a sampling capacitor coupled to the first switch;
- and
- a comparator that includes:
- a transconductor that includes:
- an input coupled to the sampling capacitor;
- and
- an output;
- a second switch coupled to the output of the transconductor;
- a first capacitor coupled to the second switch and to a ground node;
- a second capacitor coupled to the output of the transconductor;
- and
- a level detector that includes:
- an input coupled to the second capacitor;
- and
- an output coupled to the register,
- wherein the first switch is configured to couple the input voltage to the sampling capacitor and the second switch is configured to couple the output of the transconductor to the first capacitor concurrently.
17 more elements
A method comprising:
- performing a sampling phase of a successive approximation register digital-to-analog conversion that includes:
- receiving an input voltage;
- coupling the input voltage to a sampling capacitor that is coupled to an input of a transconductor;
- and
- coupling a first capacitor to an output of the transconductor such that the first capacitor is coupled between the output of the transconductor and a ground node;
- and
- performing a conversion phase of the successive approximation register digital-to-analog conversion that includes:
- decoupling the first capacitor from the output of the transconductor;
- receiving a reference voltage;
- coupling the reference voltage to the sampling capacitor;
- and
- performing a comparison of a difference between the reference voltage and the input voltage using a level detector that includes an input coupled to the output of the transconductor by a second capacitor.
9 more elements
Dependencies are inferred from the claim text.