Reference voltage generator and method for providing multiple reference voltages

A technology of reference voltage and generator, applied in the direction of instruments, adjusting electric variables, control/regulation systems, etc., can solve the problems of multi-power, chip area, consumption, etc., and achieve the effect of large voltage margin

Active Publication Date: 2008-12-24
AOTU ELECTRONICS WUHAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, voltage buffering consumes more power and die area
[0009] figure 1 Another disadvantage of the bandgap r

Method used

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  • Reference voltage generator and method for providing multiple reference voltages
  • Reference voltage generator and method for providing multiple reference voltages
  • Reference voltage generator and method for providing multiple reference voltages

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Embodiment Construction

[0040] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, so as to make the characteristics and advantages of the present invention more obvious.

[0041] The following will give a detailed description of the embodiments of the present invention. The low power bandgap reference voltage circuit with high power supply rejection ratio of the present invention can generate multiple reference voltages without using any buffer. While the invention will be described in conjunction with examples, it will be understood that it is not intended to limit the invention to these examples. On the contrary, the invention is intended to cover various alternatives, modifications and equivalents as defined within the spirit and scope of the invention as defined by the claims.

[0042] Furthermore, in the following detailed description of the invention, numerous specific details are set forth in...

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PUM

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Abstract

The present invention relates to a reference voltage generator and a method for providing a plurality of reference voltages. The reference voltage generator comprises a voltage regulator, a band-voltage circuit and an amplifying circuit. The voltage regulator with an input node is coupled to an external power supply for generating a regulated voltage source. The band-gap voltage circuit includes a first resistor and a second resistor and a first transistor and a second transistor to generate a voltage difference between the base-to-emitter voltages of the first and the second transistors. The first resistor is coupled to the first transistor. The second resistor is coupled to the first resistor, the first transistor and a regulated voltage source, the second resistor is coupled to the first resistor and a first transistor for generating the first predetermined voltage in response to the voltage difference. The amplifier circuit is coupled to the first transistor of the band-gap voltage circuit for receiving a first amplifying signal and generating an amplified signal so as to regulate the regulated voltage source. The present invention can generate an input reference voltages according under the more supply source and can improve more voltage sources.

Description

technical field [0001] The present invention relates to a reference voltage generator, in particular to a reference voltage generator providing multiple reference voltages with a high power supply rejection ratio and a method thereof. Background technique [0002] Reference circuits generate reference voltages that are used in many semiconductor applications, including digital and analog devices. Maintaining the accuracy of these semiconductor applications is directly dependent on the stability of the reference voltage. High-performance digital or analog devices require a stable reference voltage that is immune to temperature variations, power supply variations, and noise. For example, the accuracy of analog-to-digital and digital-to-analog conversions is directly dependent on the accuracy of an internal reference, which is typically a voltage reference that can withstand power supply variations, noise, and temperature variations. [0003] A common solution to an internal ...

Claims

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Application Information

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IPC IPC(8): G05F1/56G05F3/16
CPCG05F3/30
Inventor 肖安全汤小虎栗国星
Owner AOTU ELECTRONICS WUHAN
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