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公开(公告)号：US20200073430A1
公开(公告)日：2020-03-05
申请号：US16558717
申请日：2019-09-03
IPC分类号： G05F3/26
摘要： A sub-bandgap reference voltage generator includes a reference current generator generating a reference current (proportional to absolute temperature), a voltage generator generating an input voltage (proportional to absolute temperature) from the reference current, and a differential amplifier. The differential amplifier is biased by the reference current and has an input receiving the input voltage and a resistor generating a voltage proportional to absolute temperature summed with the input voltage to produce a temperature insensitive output reference voltage. The reference current generator may generate the reference current as a function of a difference between bias voltages of first and second transistors. The voltage generator may generate the input voltage by applying the current proportional to absolute temperature through a plurality of transistors coupled in series between the bias voltage of the second transistor and ground, and tapping a node between given adjacent ones of the plurality of transistors.
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公开(公告)号：US20220196485A1
公开(公告)日：2022-06-23
申请号：US17521123
申请日：2021-11-08
摘要： A temperature sensing circuit a switched capacitor circuit selectively samples ΔVbe and Vbe voltages and provides the sampled voltages to inputs of an integrator. A quantization circuit quantizes outputs of the integrator to produce a bitstream. When a most recent bit of the bitstream is a logic zero, operation includes sampling and integration of ΔVbe a first given number of times to produce a voltage proportional to absolute temperature. When the most recent bit of the bitstream is a logic one, operation includes cause sampling and integration of Vbe a second given number of times to produce a voltage complementary to absolute temperature. A low pass filter and decimator filters and decimates the bitstream produced by the quantization circuit to produce a signal indicative of a temperature of a chip into which the temperature sensing circuit is placed.
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公开(公告)号：US20240175762A1
公开(公告)日：2024-05-30
申请号：US18432943
申请日：2024-02-05
发明人： Atul DWIVEDI , Pijush Kanti PANJA
CPC分类号： G01K7/00 , H03K17/60 , G01K2219/00
摘要： A method includes generating a voltage proportional to absolute temperature, generating an uncorrected voltage complementary to absolute temperature, and generating a correction voltage. The method further includes selectively sampling the voltage proportional to absolute temperature, the uncorrected voltage complementary to absolute temperature, and the correction voltage, providing those sampled voltages to inputs of an integrator, and then quantizing outputs of the integrator to produce a bitstream. The method continues with causing the integrator to integrate the voltage proportional to absolute temperature or causing the integrator to add the correction voltage to the uncorrected voltage complementary to absolute temperature to produce a corrected voltage complementary to absolute temperature and then integrate the corrected voltage complementary to absolute temperature, depending upon a most recent bit of the bitstream. The bitstream is filtered and decimated to produce a voltage indicative of a temperature of a chip on which the method is performed.
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公开(公告)号：US20210405677A1
公开(公告)日：2021-12-30
申请号：US17467985
申请日：2021-09-07
IPC分类号： G05F3/26
摘要： A reference current generator circuit generating a reference current that is proportional to absolute temperature as a function of a difference between bias voltages of first and second transistors. A voltage generator generates an input voltage from the reference current by applying the reference current that is proportional to absolute temperature through a plurality of transistors coupled in series between the bias voltage of the second transistor and ground, with the input voltage being generated at a node between given adjacent ones of the plurality of transistors. The input voltage is complementary to absolute temperature. A differential amplifier is biased by a current derived from the reference current and generates a temperature insensitive output reference voltage from the input voltage and a voltage proportional to absolute temperature.
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公开(公告)号：US20210239540A1
公开(公告)日：2021-08-05
申请号：US17136240
申请日：2020-12-29
发明人： Atul DWIVEDI , Pijush Kanti PANJA
摘要： Circuitry generates base-to-emitter voltages (Vbe1, Vbe2) of two BJTs biased at different current densities, a base-to-emitter voltage (Vbe) of a BJT biased so Vbe is complementary to absolute temperature and has a curved non-linearity across temperature, and base-to-emitter voltages (Vbe1_c, Vbe2_c) of two BJTs biased by a temperature independent constant current and a current proportional to absolute temperature so Vbe2_c−Vbe1_c has the same but opposite curved non-linearity across temperature as Vbe. A sampling circuit samples these voltages and provides them to inputs of a loop filter. Filter outputs are quantized to produce a bitstream. The sampling circuit: when the received bit of the bitstream is zero, causes integration of Vbe1−Vbe2 to produce a voltage proportional to absolute temperature (αΔVbe); and when the received bit of the bitstream is one, causes integration of Vbe2_c−Vbe_Vbe1_c to produce a negative voltage complementary to absolute temperature −Vbe_c without non-linearity across temperature.
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