US Patent No: 5,982,221

Number of patents in Portfolio can not be more than 2000

Switched current temperature sensor circuit with compounded .DELTA.V.sub.BE

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Abstract

A switched current temperature sensor circuit with compounded .DELTA.V.sub.BE includes an amplifier having an inverting input with a corresponding non-inverting output, and a non-inverting input with a corresponding inverting output; a first PN junction connected to the non-inverting input through a first input capacitor and a second PN junction connected to the inverting input through a second input capacitor; a current supply including a low current source and a high current source; a switching device for applying in the auto zero mode the high current source to a first terminal of the first PN junction and the low current source to a first terminal of the second PN junction for providing the V.sub.BE1 of the first junction to the first capacitor and for providing the V.sub.BE2 of the second junction to the second capacitor and for applying in the temperature measurement mode the low current source to the first terminal of the first PN junction and the high current source to the first terminal of the second PN junction for providing the negative .DELTA.V.sub.BE1 of the first PN junction to the first capacitor and the positive .DELTA.V.sub.BE2 of the second PN junction to the second capacitor. The first feedback capacitor interconnected between the inverting output and non-inverting input and a second feedback capacitor interconnected between the non-inverting output and inverting input in the amplifier to define the gain on each of the .DELTA.V.sub.BE inputs to produce a differential voltage across the outputs representative of the average temperature of the PN junctions; and first and second reset switching devices for discharging the first and second feedback capacitors, respectively, and for enabling the amplifier to equalize its input in the auto-zero mode.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
ANALOG DEVICES, INC.NORWOOD, MA2158

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Tuthill, Michael G Limerick, IE 8 250

Cited Art

Patent Info (Count) # Cites Year
 
ANALOG DEVICES, INC. (1)
5,195,827 Multiple sequential excitation temperature sensing method and apparatus 68 1992
 
HOCHIKI CORPORATION (1)
4,331,888 Temperature detecting apparatus 20 1979
 
RESPIRATORY SUPPORT PRODUCTS, INC. (1)
5,066,140 Temperature measurement 14 1987
 
UNISYS CORPORATION (1)
5,213,416 On chip noise tolerant temperature sensing circuit 20 1991

Patent Citation Ranking

Forward Cites

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6,808,307 Time-interleaved sampling of voltages for improving accuracy of temperature remote sensors 14 2002
6,637,934 Constant offset buffer for reducing sampling time in a semiconductor temperature sensor 14 2002
6,867,470 Multi-slope analog temperature sensor 3 2002
6,736,540 Method for synchronized delta-VBE measurement for calculating die temperature 28 2003
6,869,216 Digitizing temperature measurement system 15 2003
6,750,796 Low noise correlated double sampling modulation system 20 2003
7,828,479 Three-terminal dual-diode system for fully differential remote temperature sensors 0 2004
6,957,910 Synchronized delta-VBE measurement system 24 2004
7,075,475 Correlated double sampling modulation system with reduced latency of reference to input 6 2004
7,252,432 Efficient method of sharing diode pins on multi-channel remote diode temperature sensors 1 2004
6,962,436 Digitizing temperature measurement system and method of operation 15 2005
 
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6,847,319 Temperature-to-digital converter 6 2003
7,030,793 Accurate testing of temperature measurement unit 5 2004
7,281,846 Integrated resistance cancellation in temperature measurement systems 38 2004
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7,332,952 Accurate temperature measurement method for low beta transistors 2 2005
 
INTERSIL AMERICAS INC. (6)
7,686,508 CMOS temperature-to-digital converter with digital correction 2 2006
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ANALOG DEVICES, INC. (5)
6,097,239 Decoupled switched current temperature circuit with compounded .DELTA.V .sub.be 39 1999
6,617,838 Current measurement circuit 12 2001
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7,112,948 Voltage source circuit with selectable temperature independent and temperature dependent voltage outputs 18 2005
7,170,334 Switched current temperature sensing circuit and method to correct errors due to beta and series resistance 11 2005
 
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7,255,476 On chip temperature measuring and monitoring circuit and method 7 2004
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7,648,271 Systems and methods for temperature measurement using n-factor coefficient correction 1 2007
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7,857,510 Temperature sensing circuit 4 2003
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7,758,240 PN-junction temperature sensing apparatus 3 2006
 
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6,554,470 M-level diode junction temperature measurement method cancelling series and parallel parasitic influences 10 2001
 
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8,144,047 Current-mode dual-slope temperature-digital conversion device 0 2010
 
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6,198,267 Current generator for delivering a reference current of which the value is proportional to the absolute temperature 5 1999
 
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6,890,097 Temperature measuring sensor incorporated in semiconductor substrate, and semiconductor device containing such temperature measuring sensor 25 2003
 
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OTHER [CHECK PATENT PROFILE FOR ASSIGNMENT INFORMATION] (1)
7,052,180 LED junction temperature tester 9 2003