Differential operational amplifier and bandgap reference voltage generating circuit

A technology of operational amplifiers and reference voltages, applied in differential amplifiers, amplifiers, DC-coupled DC amplifiers, etc., can solve problems affecting reference voltages, and achieve the effect of stabilizing reference voltages

Active Publication Date: 2015-07-01
SILICON MOTION TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But if V GS increase, it indicates that the first voltage V 1 and the second voltage V 2 Gap D 12 There are also changes (e.g. image 3 shown), which will also affect the reference voltage generated by the bandgap reference voltage generation circuit

Method used

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  • Differential operational amplifier and bandgap reference voltage generating circuit
  • Differential operational amplifier and bandgap reference voltage generating circuit
  • Differential operational amplifier and bandgap reference voltage generating circuit

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Embodiment Construction

[0044] Figure 4 A block diagram of a differential operational amplifier 400 according to an embodiment of the invention is shown. Such as Figure 4 As shown, the differential operational amplifier 400 includes a voltage adjustment module 401 and a differential signal operation module 403. The voltage adjustment module 401 is coupled between a first predetermined voltage source and a second predetermined voltage source (V DD And GND, not shown in Figure 4 ), receive a first voltage V 1 According to a first voltage adjustment value, a first adjusted voltage V is generated 1a , And receive a second voltage V 2 According to a second voltage adjustment value, a second adjusted voltage V 2a , Wherein the first voltage adjustment value and the second voltage adjustment value change corresponding to the temperature. The differential signal arithmetic module 403 is coupled between the first predetermined voltage source and the second predetermined voltage source, according to the firs...

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Abstract

A differential operational amplifier, which comprises: a voltage adjusting module, coupled between a first predetermined voltage source and a second predetermined voltage source, for adjusting a first voltage via a first voltage adjusting value to generate a first adjusted voltage, and for adjusting a second voltage via a second voltage adjusting value to generate a second adjusted voltage, wherein the first voltage adjusting value and the second voltage adjusting value change corresponding to a temperature; and a differential signal computing module, coupled between the first predetermined voltage source and the second predetermined voltage source, for generating an output voltage according the first adjusted voltage and the second adjusted voltage.

Description

Technical field [0001] The present invention relates to a differential operational amplifier and a bandgap reference voltage generating circuit using the differential operational amplifier, in particular to a differential operational amplifier capable of reducing the influence of temperature on input voltage and a bandgap using the differential operational amplifier Reference voltage generating circuit. Background technique [0002] In circuit design, a reference voltage generating circuit is usually used to generate a more accurate reference voltage for use as a reference for other components. The reference voltage generating circuit has many forms, among which the bandgap reference voltage generating circuit is more commonly used. The internal components of this type of circuit will react to the temperature coefficient to adjust its voltage or current, so that the generated reference voltage can be maintained at a stable value. [0003] The bandgap reference voltage generating ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45G05F1/56
CPCG05F3/16H03F1/301H03F3/45269H03F2203/45286H03F2200/504H03F3/45183H03F2200/447H03F2203/45612G05F3/30
Inventor 王巧星
Owner SILICON MOTION TECH CORP
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