US 2017/0257113 A1 · High Accuracy Temperature Sensor

Abstract

A temperature sensor is disclosed. In one aspect, the temperature sensor provides a digital output having a precise degree/code step. For example, each step in the digital output code may correspond to one degree Celsius. In one aspect, a temperature sensor comprises a precision band-gap circuit and a sigma delta modulator (SDM) analog-to-digital convertor (ADC). A bandgap voltage and a PTAT voltage may be provided from the band-gap circuit as an input to the SDM ADC. The SDM ADC may produce an output based on the difference between the PTAT voltage and the bandgap voltage. The temperature sensor may also have logic that outputs a temperature code based on the output of the SDM ADC.

Claims20

Dependent claims

An apparatus, comprising:

a sigma delta modulator (SDM) analog-to-digital convertor (ADC) having an input and an output that responds to the input;
and
logic configured to provide a proportional to absolute temperature voltage minus a temperature independent reference voltage to the input of the SDM ADC, the logic configured to generate a digital temperature code based on the output of the SDM ADC.

An apparatus comprising:

a reference generator configured to generate a bandgap voltage and a proportional to absolute temperature voltage;
a first order, single-bit sigma delta modulator (SDM) analog-to-digital convertor (ADC);
and
control logic configured to provide the proportional to absolute temperature voltage minus the bandgap voltage as an input of the SDM ADC, the control logic configured to generate a digital temperature code based on an output of the SDM ADC.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

15/178,363Filed 9 Jun 2016

Priority

IN 2016410076554 Mar 2016

Published

7 Sep 2017

Term ends

Not estimatedThe source records don’t support an estimate.

Classification10 codes

G01K 7/34
Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using…: using…
G01K 7/01
Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using…: using…
G05F 3/245
With compensation for device parameters, e.g. channel width modulation, threshold voltage, processing, or external variations, e.g. temperature,…:…
G01K 2219/00
Thermometers with dedicated analog to digital converters

High Accuracy Temperature Sensor

Life of this patent

High Accuracy Temperature Sensor

Life of this patent

Abstract

Claims20