Back to results
US 12,584,802 B2Granted
Method and apparatus for temperature sensing
AssigneeAvago Technologies International Sales Pte. Limited
InventorsKareem Abdelghani Ibraheem Mohamed Ragab, Xiaofeng Lin, Darwin Cheung, Chi Mo, Vinay Chandrasekhar, Jungwoo Song, Xicheng Jiang
Life of this patent
Estimating the term…
Abstract
An apparatus includes a temperature sensing circuit that includes both on-chip and off-chip components. The apparatus includes components that use the same source as a reference voltage, thus allowing variations in the reference voltage to be compensated for. Additionally, the apparatus can provide error averaging to compensate for deterministic error sources.
Claims18
An apparatus, comprising:
- a substrate;
- a first resistor physically on the substrate;
- an analog-to-digital converter (ADC) coupled to the first resistor, the ADC configured to:
- receive a resistor voltage, wherein the resistor voltage is applied across the first resistor, and
- provide a digital output based on the resistor voltage;
- and
- a second resistor coupled to the substrate, wherein the second resistor is physically off of the substrate;
- a first amplifier configured to provide a first voltage to the second resistor;
- and
- a second amplifier configured to receive the first voltage from the first amplifier and provide a second voltage based on the first voltage, wherein the ADC is further configured to receive the second voltage from the second amplifier.
7 more elements
An apparatus, comprising:
- a first amplifier configured to provide a first voltage output based on a first reference voltage;
- a second amplifier configured to:
- use the first voltage output as a second reference voltage, and
- provide a second voltage output based on the second reference voltage;
- a resistor divider configured to receive the first output voltage, the resistor divider comprising a temperature-dependent resistor configured to change resistance based on a temperature change;
- and
- an analog-to-digital converter (ADC) configured to:
- receive the second reference voltage,
- receive a resistor voltage, wherein the resistor voltage is applied across the temperature-dependent resistor, and
- generate, based on the second reference voltage and the resistor voltage, a digital output corresponding to a temperature.
7 more elements
A circuit, comprising:
- a component comprising an input;
- a switch coupled to the component at the input;
- and
- a controller configured to, in response to a voltage offset at the component:
- obtain, from a first sample, a first voltage measurement of the voltage offset,
- cause the switch to reverse a polarity of the voltage offset,
- subsequent to the reversal of the polarity, obtain, from a second sample, a second voltage measurement of the voltage offset, and
- determine an average of the first voltage measurement and the second voltage measurement.
5 more elements
Dependencies are inferred from the claim text.