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Sub-bandgap compensated reference voltage generation circuit

A sub-bandgap, reference current technology, used in the adjustment of electrical variables, instruments, control/regulation systems, etc.

Active Publication Date: 2020-03-10
STMICROELECTRONICS SRL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the resulting sub-bandgap reference voltage is affected by resistor process variations as well as the resistor's resistance variation with respect to temperature

Method used

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  • Sub-bandgap compensated reference voltage generation circuit
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Embodiment Construction

[0016] The following disclosure enables those skilled in the art to make and use the technical solutions disclosed herein. The general principles described herein may be employed in embodiments and applications other than those detailed above without departing from the spirit and scope of the present disclosure. The present disclosure is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed or suggested herein.

[0017] now refer to figure 1 Describes the sub-bandgap voltage reference (Vref) generator. For ease of explanation and understanding, the Vref generator will be described in terms of three constituent circuit blocks 12 , 14 and 16 . Block 12 is responsible for generating a current Iptat proportional to absolute temperature, while block 14 is responsible for generating a voltage Vctat complementary to absolute temperature, which in turn is used to control a differential ampli...

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Abstract

The invention relatest to a sub-bandgap compensated reference voltage generation circuit. 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 toproduce 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.

Description

[0001] related application [0002] This application claims priority to U.S. Provisional Patent Application 62 / 726,564, filed September 4, 2018, the contents of which are incorporated by reference to the fullest extent permitted by law. technical field [0003] The present disclosure relates to the field of temperature-independent reference voltage generation, and in particular to circuits for generating a temperature-independent reference voltage that is part of a generated bandgap voltage. Background technique [0004] Integrated circuit technology does not provide an intrinsically constant reference voltage regardless of changes in temperature. Therefore, the practical approach is to generate a temperature-independent reference voltage by combining two voltages with precisely complementary temperature characteristics. By adding a voltage that increases with temperature (e.g., proportional to absolute temperature) with a voltage that decreases with temperature (e.g., com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F3/28
CPCG05F3/26G05F3/30G05F3/262G05F3/267
Inventor P·K·潘加G·D·凯南格
Owner STMICROELECTRONICS SRL
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