公开(公告)号：US20200073430A1

公开(公告)日：2020-03-05

申请号：US16558717

申请日：2019-09-03

Applicant: STMicroelectronics International N.V.

Inventor： Pijush Kanti PANJA ,  Gautam Dey KANUNGO

IPC: G05F3/26

Abstract: 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.

公开(公告)号：US20210405677A1

公开(公告)日：2021-12-30

申请号：US17467985

申请日：2021-09-07

Applicant: STMicroelectronics International N.V.

Inventor： Pijush Kanti PANJA ,  Gautam Dey KANUNGO

IPC: G05F3/26

Abstract: 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.