Two way single VREF trim for fully differential CDAC for accurate temperature sensing

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United States of America Patent

PATENT NO 11514990
SERIAL NO

17349963

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Abstract

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A temperature sensing circuit of a data storage system includes a temperature sensor, a digital-to-analog circuit, and a reference generation and trimming circuit configured to generate a common mode voltage (VCM), a positive reference voltage (VREFP), and a negative reference voltage (VREFN) using a single band gap reference signal. The trimming circuit is configured to trim the VCM, VREFP, and VREFN by adjusting a VC trim signal to increase the VCM until a VCM error is below a threshold; adjusting a high temperature trim signal to increase the VREFP and decrease the VREFN until a digital temperature signal associated with the digital-to-analog circuit attains a predetermined accuracy level for a first temperature; and adjusting a low temperature trim signal to increase the VREFP, VCM, and VREFN until the digital temperature signal attains a predetermined accuracy level for a second temperature.

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Patent Owner(s)

  • SANDISK TECHNOLOGIES LLC

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Choudhary, Anupam G N Bengaluru, IN 1 2
Kumar, Nittala Venkata Satya Somanadh Bangalore, IN 2 4
Lakshminarayana, Addagalla Aswani Krishna Andhra Pradesh, IN 2 5
Yadala, Sridhar Bangalore, IN 26 271

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