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Switched-capacitor bandgap reference circuit using chopping technique

A technology of switching devices and circuits, applied in the field of switched capacitor bandgap reference circuits using chopper technology, which can solve problems such as temperature drift output voltage

Inactive Publication Date: 2017-05-10
MARVELL WORLD TRADE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the offset of CMOS op amps can result in output voltages with significant temperature drift

Method used

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  • Switched-capacitor bandgap reference circuit using chopping technique
  • Switched-capacitor bandgap reference circuit using chopping technique
  • Switched-capacitor bandgap reference circuit using chopping technique

Examples

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Embodiment Construction

[0028] figure 1 It is a block diagram of a bandgap reference circuit 1-100 according to an embodiment. The bandgap reference circuit 1-100 includes a bandgap core 1-10, a discrete time circuit 1-150, and a filter 1-190.

[0029] The band gap core 1-110 generates a current proportional to absolute temperature (PTAT) and provides a PTAT voltage and a complementary to absolute temperature (CTAT) voltage to the discrete time circuit 1-150. In one embodiment, the bandgap core 1-110 includes a resistor, a bipolar junction transistor (BJT), and a first chopping operational amplifier that performs a first chopping operation.

[0030] The discrete time circuit 1-150 multiplies the PTAT voltage, CTAT voltage, and residual offset voltage, and adds the multiplied PTAT voltage, CTAT voltage, and residual offset voltage to provide a voltage to the filter 1-190. The discrete time circuit 1-150 provides a first voltage V during the first time interval out1 To filter 1-190, and the first voltage...

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Abstract

The method relates to a switched-capacitor bandgap reference circuit using chopping technique. A method includes providing a first voltage to a first output node during a first time interval, providing a second voltage to the first output node during a second time interval, and averaging the first and second voltages to provide a reference voltage to a second output node. The first voltage includes a proportional-to-absolute-temperature (PTAT) component, a complementary-to-absolute-temperature (CTAT) component, and a first residual offset component. The second voltage includes the PTAT component, the CTAT component, and a second residual offset component. An apparatus includes a discrete-time circuit to provide the first voltage to the first output node during the first time interval and to provide the second voltage to the first output node during the second time interval, and a filter to average the first and second voltages to provide the reference voltage to the second output node.

Description

[0001] Cross references to related applications [0002] This disclosure claims the benefit of U.S. Provisional Application No. 62 / 246,203 filed on October 26, 2015, which is hereby incorporated by reference in its entirety. Background technique [0003] Bandgap reference circuits generate output voltages that are substantially independent of temperature changes, and therefore have been used in integrated circuits to supply one or more stable operating voltages. In order to supply the operating voltage, the conventional bandgap reference circuit adds a voltage proportional to absolute temperature (PTAT) to a voltage complementary to absolute temperature (CTAT). For example, the CMOS bandgap reference circuit includes a complementary metal oxide semiconductor (CMOS) operational amplifier (op-amp) to generate the PTAT voltage. However, the offset of the CMOS operational amplifier can cause an output voltage with significant temperature drift. Summary of the invention [0004] In one...

Claims

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Application Information

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IPC IPC(8): G05F1/56
CPCG05F3/30H03F3/393H03F3/45475H03F3/45968H03F2200/271H03F2203/45044H03F2203/45286G05F1/56
Inventor 许伟伟P·厄帕德雅雅N·刘王晓悦
Owner MARVELL WORLD TRADE LTD
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