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US 11,387,837 B1Granted
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 comprising:
- an input configured to receive an input analog voltage;
- a first switch that includes:
- a first input coupled to the input of the circuit;
- a second input coupled to receive a reference voltage;
- and
- an output;
- a first capacitor coupled to the output of the first switch;
- and
- a comparator that includes:
- an amplifier that includes:
- a transconductor that includes an input coupled to the first capacitor and an output;
- a buffer coupled to the output of the transconductor;
- a second capacitor coupled to a ground node;
- and
- a second switch coupled between the second capacitor and the output of the transconductor;
- a third capacitor coupled to the amplifier;
- and
- a latch coupled to the third capacitor.
15 more elements
A successive approximation analog-to-digital converter, comprising:
- an input for receiving an input analog voltage;
- sample phase circuitry comprising an amplifier and for providing the amplifier with a first set of electrical attributes and for sampling the input analog voltage in a sample phase;
- and
- conversion phase circuitry comprising the amplifier and for providing the amplifier with a second set of electrical attributes differing from the first set of electrical attributes and for converting a comparison, of the sampling of the input analog voltage relative to a reference voltage, to a digital value in a conversion phase,
- wherein the sample phase circuitry comprises circuitry for switching a capacitance between an output of the amplifier and a fixed potential in the sample phase;
- and
- wherein the circuitry for switching is further for disconnecting the capacitance from between the output of the amplifier and the fixed potential in the conversion phase.
4 more elements
A method of successive approximation of a digital code from an input analog voltage, comprising:
- sampling the input analog voltage with an amplifier having a first set of electrical attributes in a sample phase, wherein the sampling in the sample phase include switchably coupling a capacitor to an output of the amplifier such that the capacitor is coupled between the output of the amplifier and a ground node;
- and
- converting a comparison, of the sampling of the input analog voltage relative to a reference voltage, to a digital value in a conversion phase while providing the amplifier a second set of electrical attributes differing from the first set of electrical attributes, wherein the converting in the conversion phase includes decoupling the capacitor from the output of the amplifier.
Dependencies are inferred from the claim text.