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Method and apparatus for compensating offset drift over temperature

A technology that varies with temperature and phase, applied in the field of analog front-end

Active Publication Date: 2021-12-07
TEXAS INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

M is an integer

Method used

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  • Method and apparatus for compensating offset drift over temperature
  • Method and apparatus for compensating offset drift over temperature
  • Method and apparatus for compensating offset drift over temperature

Examples

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Embodiment Construction

[0015] figure 1 An analog-to-digital converter (ADC) 100 of an example embodiment is illustrated. ADC 100 includes a comparator 110 that receives a threshold voltage Vt 112 . Comparator 110 includes a non-inverting terminal 114 and an inverting terminal 116 . Comparator 110 receives threshold voltage Vt 112 at non-inverting terminal 114 . ADC 100 also includes a basic set of capacitors 104, denoted C1, C2 through CT. ADC 100 includes a set of M offset capacitors 102, denoted CO1, CO2 through COM. M is an integer. The set of base capacitors 104 and the set of M offset capacitors 102 are coupled to an inverting terminal 116 of a comparator 110 .

[0016] Control logic circuit 120 is coupled to comparator 110 . Control logic 120 includes state logic 122 and trim logic 124 . State logic circuit 122 is coupled to first set of switches 126 . The base set of capacitors 104 receives an input voltage Vin 132 and one of a set of reference voltages through a first set of switches...

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Abstract

In the described example of an analog-to-digital converter (ADC) (100), the ADC includes a comparator (110) that receives a threshold voltage (112). A basic set of capacitors (104) are coupled to the comparator (110) and receive an input voltage (132) and one of a set of reference voltages. A set of M offset capacitors (102) are coupled to the comparator (110) and receive one of a primary voltage (142) and a secondary voltage (144). M is an integer. The difference between the primary voltage (142) and the secondary voltage (144) varies linearly with temperature.

Description

technical field [0001] The present application relates generally to an analog front end (AFE), and more particularly to compensating for offset drift over temperature in an AFE. Background technique [0002] Analog and digital systems are typically implemented in integrated circuits using system-on-chip (SOC) technology. Such systems typically include analog front-end (AFE) circuitry. The AFE circuit operates as an interface between an external input through which an analog signal is input and a digital signal processing unit that processes the received signal in digital format. [0003] AFE circuits are widely used in various devices such as down converters for wireless digital communication equipment, digital image scanners, digital cameras, and voice codecs. The AFE circuit includes an amplifier and an analog-to-digital converter (ADC). The amplifier amplifies the received analog signal, and the ADC converts the amplified analog signal into a digital signal. The AFE a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/08
CPCH03M1/1057H03M1/468H03M1/0607
Inventor D·曼达
Owner TEXAS INSTR INC