Voltage Regulator and Its Reference Voltage Generation Circuit

A voltage regulator and reference voltage technology, which is applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problems of voltage amplitude jitter, large occupied area, high power consumption, etc., and achieve low cost, low power consumption, small area effect

Active Publication Date: 2011-12-14
SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem solved by the invention is that the output voltage of the

Method used

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  • Voltage Regulator and Its Reference Voltage Generation Circuit
  • Voltage Regulator and Its Reference Voltage Generation Circuit
  • Voltage Regulator and Its Reference Voltage Generation Circuit

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Embodiment Construction

[0040] In the process of designing the voltage regulator, the inventors of the present invention found that due to the fixed value of the reference voltage, when the load unit connected to the voltage regulator switches from one working mode to another, such as the memory from the standby mode Turning to the working mode (when performing a read operation), the load cell will have a shunt effect, and the transient current through the PMOS transistor M1 is fixed, which causes the current flowing through the resistors R1 and R2 to become smaller, thus, the voltage regulator. The output voltage Vout decreases, and at the same time, the feedback voltage vfb generated by the feedback unit also decreases. Since the voltage value of the comparator and the drive unit can only be recovered after a certain feedback delay, during the feedback delay period, the voltage will be reduced. The amplitude jitter of the voltage Vout output by the regulator affects the work of the load unit, for ex...

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PUM

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Abstract

The invention discloses a voltage regulator and a reference voltage generating circuit thereof. The voltage regulator comprises a reference voltage generating circuit, a comparator, a driving unit and a feedback unit, wherein the input end of the driving unit is connected with the output end of the comparator; the output end of the driving unit serves as the output end of the voltage regulator; the input end of the feedback unit is connected with the output end of the driving unit; the output end of the feedback unit is connected with the first input end of the comparator; the reference voltage generating circuit comprises a first voltage dividing unit and a second voltage dividing unit; the first voltage dividing unit is used for dividing a first voltage in the working mode of a load unit to generate a first reference voltage input to the second input end of the comparator; the second voltage dividing unit is used for dividing a second voltage in the standby mode of the load unit to generate a second reference voltage input to the second input end of the comparator; and the second reference voltage is greater than the first reference voltage. According to the invention, the influence of amplitude perturbation on the work of the load unit can be lowered, and the floor area of a decoupling capacitor is small.

Description

technical field [0001] The invention relates to a voltage regulator and a reference voltage generating circuit of the voltage regulator. Background technique [0002] Multiple precise voltages are often required inside the chip, which are used as control signals or reference voltage signals for different modules, such as programming voltages and erasing voltages in flash memory. The voltage generation circuit in the prior art generally uses a reference voltage source to generate a reference voltage, and then uses a comparator, a drive unit and a feedback unit to adjust the reference voltage, and generates an output voltage with a corresponding voltage value according to the requirements of different modules. [0003] see figure 1 , the existing voltage regulator includes a reference voltage generating circuit 1 , a comparator 2 , a driving unit 3 and a feedback unit 4 , and the driving unit 3 outputs a voltage Vout to a load unit 5 . The reference voltage generation circui...

Claims

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Application Information

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IPC IPC(8): G05F1/56G05F3/16
Inventor 杨光军
Owner SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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