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Patent Searching and Data


Title:
DIGITAL TEMPERATURE SENSOR CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2019/024176
Kind Code:
A1
Abstract:
Provided is a digital temperature sensor circuit. The circuit comprises a PTAT current source (1) used for generating a PTAT current in direct proportion to an absolute temperature, a sigma-delta modulation module (2) and a digital filter (3). The sigma-delta modulation module (2) comprises an integrator (21), an analog-to-digital conversion unit (22), a feedback digital-to-analog conversion unit (23). The integrator (21) is used for converting the PTAT current into a temperature voltage; the analog-to-digital conversion unit (22) is used for comparing the temperature voltage with a band-gap reference voltage to generate a digital modulation signal with a duty ratio in direct proportion to the temperature; the feedback digital-to-analog conversion unit (23) is used for adjusting a voltage input by the analog-to-digital conversion unit (22) to control a charging/discharging velocity of the integrator (21); and the digital filter (3) is used for quantizing the digital modulation signal to a digital signal and outputting it. According to the circuit, an integral amplifier is removed in the Sigma-delta modulation module (2), so that the power consumption is greatly reduced; on one hand, the digital temperature sensor circuit is output in the mode of the digital modulation signal, so that the measurement precision is improved; and on the other hand, the temperature inside a chip is directly measured and the temperature value is quantized and converted into a binary code, so that the application range is expanded.

Inventors:
HU RONGBIN (CN)
WANG JIAN'AN (CN)
FU DONGBING (CN)
CHEN GUANGBING (CN)
ZHANG ZHENGPING (CN)
JIANG HEQUAN (CN)
HU GANGYI (CN)
Application Number:
CN2017/101203
Publication Date:
February 07, 2019
Filing Date:
September 11, 2017
Export Citation:
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Assignee:
NO 24 RESEARCH INSTITUTE OF CHINA ELECTRONICS TECH GROUP CORPORATION (CN)
International Classes:
G06F11/30; H03L5/00; H03M1/66
Foreign References:
CN105444907A2016-03-30
CN103296904A2013-09-11
CN102435336A2012-05-02
CN104390715A2015-03-04
US20150003490A12015-01-01
Other References:
WEI, RONGSHAN ET AL.: "Design of a Sigma-Delta Modulator Applied in the Temperature Sensor", CHINA INTEGRATED CIRCUIT, 30 June 2014 (2014-06-30)
Attorney, Agent or Firm:
J.Z.M.C. PATENT AND TRADEMARK LAW OFFICE (CN)
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