Chopped wave band-gap reference circuit

A technology of reference circuit and chopper circuit, which is applied in the direction of adjusting electric variables, control/regulation systems, instruments, etc., can solve the problems of increasing chip area and cost, large resistance and capacitance, etc., to reduce chip cost, improve precision, and high filtering effect of effect

Active Publication Date: 2014-06-18
VERISILICON MICROELECTRONICS SHANGHAI +3
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  • Abstract
  • Description
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Problems solved by technology

However, the low-pass filter that realizes chopping technology requires a l

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  • Chopped wave band-gap reference circuit
  • Chopped wave band-gap reference circuit
  • Chopped wave band-gap reference circuit

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Embodiment Construction

[0034] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

[0035] see Figure 1 ~ Figure 3 . It should be noted that the diagrams provided in this embodiment are only schematically illustrating the basic idea of ​​the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the components in actual implementation. Dimensional drawing, the type, quantity and proportion of each component can be changed arbi...

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Abstract

The invention provides a chopped wave band-gap reference circuit which comprises a starting circuit module, a clamping operational amplifier module, an offset voltage eliminating module and a band-gap reference module, wherein the starting circuit module is used for supplying a starting voltage to the band-gap reference module and is closed after the band-gap reference module is started; the clamping operational amplifier module is used for clamping voltages at two nodes of the band-gap reference module; the offset voltage eliminating module is used for eliminating an offset voltage of the clamping operational amplifier module; the band-gap reference module is used for generating the voltage which does not change following the temperature; the clamping operational amplifier module comprises a first chopped wave circuit, a second chopped wave circuit and a filtering circuit for a switch capacitor. A chopped wave technique is adopted by the chopped wave band-gap reference circuit for eliminating the offset voltage and acquiring a high-precision output voltage. The switch capacitor instead of a traditional RC technique is adopted by a filter, so that the area of the filter is reduced, the chip cost is lowered, and the integration degree is increased.

Description

technical field [0001] The invention relates to the field of large-scale analog integrated circuit design, in particular to a chopper bandgap reference circuit for high-precision and small-area bandgap reference realized by switched capacitor filtering, which is suitable for a system on chip (SOC). Background technique [0002] The reference voltage source is a very important unit module circuit in a CMOS integrated circuit, which can provide a high-precision and high-stability reference voltage, and is widely used in various analog and digital systems. With the continuous development of mobile communication and other communication technologies, the requirements for the reference voltage source module are getting higher and higher. [0003] The design of the CMOS reference voltage source is basically based on the bandgap reference source technology. A voltage reference source with an extremely low temperature coefficient is obtained by using a bandgap structure combined wit...

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Application Information

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IPC IPC(8): G05F1/567
Inventor 张旻琦黄志忠肖轶
Owner VERISILICON MICROELECTRONICS SHANGHAI
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