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Reference voltage generating circuit and method

A technology for generating circuits and reference voltages, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problems of power consumption and large circuit area, large and complex, affecting the accuracy of the output reference voltage and its temperature coefficient, etc. Achieve the effects of low power consumption, accurate temperature coefficient and simple structure

Active Publication Date: 2014-03-12
NOVATEK MICROELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, this type of existing architecture is too large and complex due to the multiple buffers, resulting in much larger power consumption and circuit area than designs without temperature compensation effects
In addition, the buffer that performs voltage addition and subtraction will cause redundant offset (offset), which greatly affects the accuracy of the output reference voltage and its temperature coefficient

Method used

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  • Reference voltage generating circuit and method

Examples

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no. 1 example

[0022] Please refer to figure 2 , which shows a schematic circuit diagram of the reference voltage generating circuit according to the first embodiment of the present invention. like figure 2 As shown, the reference voltage generation circuit 200 includes: a bandgap reference circuit 210, a reference voltage generation circuit 220, a bias current source circuit 230, and one or more regulated output circuits (here, two regulated output circuits 240A and 240B example). The following description can be easily deduced to a larger number of regulated output circuits.

[0023] The bandgap reference circuit 210 is configured to generate initial currents with different temperature coefficients. In a preferred situation, the initial currents include a first current I1 with a positive temperature coefficient and a second current I2 with a negative temperature coefficient.

[0024] The reference voltage generating circuit 220 is coupled to the bandgap reference circuit 210, and is ...

no. 2 example

[0041] Please refer to Figure 4 , which shows a schematic circuit diagram of a reference voltage generating circuit according to a second embodiment of the present invention. and figure 2 similar to the reference voltage generating circuit 200, Figure 4 The reference voltage generating circuit 400 includes: a bandgap reference circuit 410, a reference voltage generating circuit 420, a bias current source circuit 430, and one or more regulated output circuits (also referred to as two regulated output circuits 440A and 440B here. example to illustrate).

[0042] At Figure 4 In the example shown, the bandgap reference circuit 410 may also include a current proportional to absolute temperature generating circuit 410A and a voltage-to-current converting circuit 410B. However, compared to figure 2 As shown in the reference voltage generating circuit 200, Figure 4 The difference of the shown reference voltage generation circuit 400 is that the bias current source circuit ...

no. 3 example

[0053] Please refer to Figure 5A and Figure 5B , which shows a schematic circuit diagram of the reference voltage generating circuit 500 according to the third embodiment of the present invention. and Figure 4 similar to the reference voltage generating circuit 400, Figure 5A and Figure 5B The reference voltage generating circuit 500 includes: a bandgap reference circuit 510, a reference voltage generating circuit 520, a bias current source circuit 530, and one or more voltage-stabilizing output circuits (also referred to as two voltage-stabilizing output circuits 540A and 540B here. example to illustrate). At Figure 5A and Figure 5B In the example shown, the bandgap reference circuit 510 may also include a current proportional to absolute temperature generating circuit 510A and a voltage-to-current converting circuit 510B. However, compared to Figure 4 As shown in the reference voltage generating circuit 400, Figure 5A and Figure 5B The difference of the r...

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Abstract

The invention discloses a reference voltage generating circuit and method. The reference voltage generating circuit comprises a band gap reference circuit, a reference voltage generating circuit, a bias voltage current source circuit and one or more stable-voltage output circuits, wherein the band gap reference circuit generates multiple initial currents with different temperature coefficients; the reference voltage generating circuit is used for combining the initial currents into a resultant current and converting the resultant current into one or more reference voltages; the bias voltage current source circuit is used for generating one or more bias voltage currents according to at least one of the initial currents; and each stable-voltage output circuit is used for converting one of the one or more bias voltage currents into a differential voltage which is added to the reference voltage to form an output reference voltage. Each output reference voltage has a temperature coefficient, and thus the reference voltage generating circuit can be flexibly and widely used.

Description

technical field [0001] The present invention relates to a reference voltage generation circuit and method, and in particular to a reference voltage generation circuit and method utilizing a bandgap reference circuit. Background technique [0002] Due to the characteristics of semiconductors, in many applications, the output reference voltage of the reference voltage generation circuit needs to include a temperature coefficient (TC) to compensate for temperature effects. For example, if there is an application whose output reference voltage specification is 1.6V+10mV / ℃, the adjustment range of the absolute voltage value of this output reference voltage is: 1.2V~2.0V, and the adjustable range of its temperature coefficient is 5mV / ℃~ 15mV / °C. [0003] Figure 1A A schematic diagram showing the adjustment of the absolute voltage value of the output reference voltage. At Figure 1A Among them, curves A1, B1 and C1 represent output reference voltages of 1.2V+10mV / °C, 1.6V+10mV / °...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F3/26
Inventor 胡敏弘吴振聪丁振国苏品翰
Owner NOVATEK MICROELECTRONICS CORP
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