公开(公告)号：US11892360B2

公开(公告)日：2024-02-06

申请号：US17136240

申请日：2020-12-29

Applicant: STMicroelectronics International N.V.

Inventor： Atul Dwivedi ,  Pijush Kanti Panja

IPC: G01K7/00 ,  H03K17/60

CPC classification number: G01K7/00 ,  H03K17/60 ,  G01K2219/00

Abstract: 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.

公开(公告)号：US11867572B2

公开(公告)日：2024-01-09

申请号：US17521123

申请日：2021-11-08

Applicant: STMicroelectronics International N.V.

Inventor： Pijush Kanti Panja ,  Kallol Chatterjee ,  Atul Dwivedi

IPC: H03K17/14 ,  G01K7/14 ,  G01K7/01 ,  H03K19/018 ,  H03M1/12

CPC classification number: G01K7/14 ,  G01K7/01 ,  H03K17/14 ,  H03K19/018 ,  H03M1/1245

Abstract: 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.