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Low pass filter circuit and voltage regulator

A low-pass filter circuit and reference voltage technology, applied in the direction of regulating electrical variables, control/regulating systems, instruments, etc., can solve the problems of voltage regulator output voltage drop, etc. The effect of good output voltage accuracy

Inactive Publication Date: 2013-09-18
SII SEMICONDUCTOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the output voltage of the low-pass filter circuit decreases when the potential of the drain decreases, the output voltage of the voltage regulator also decreases according to the operation of the voltage regulator.

Method used

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  • Low pass filter circuit and voltage regulator
  • Low pass filter circuit and voltage regulator
  • Low pass filter circuit and voltage regulator

Examples

Experimental program
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Embodiment Construction

[0027] figure 1 It is a figure which shows the low-pass filter circuit of this embodiment.

[0028] The low-pass filter circuit 103 of this embodiment includes PMOS transistors 121 and 122 , a current source 111 , a capacitor 161 , an input terminal 112 , a back gate input terminal 114 and an output terminal 113 .

[0029] The source terminals of the PMOS transistors 121 and 122 are connected to the input terminal 112 , the substrate terminals are connected to the back gate input terminal 114 , and the gate terminals are connected to one terminal of the current source 111 and the drain terminal of the PMOS transistor 122 . The other terminal of the current source 111 is connected to the ground terminal 100 . The drain terminal of the PMOS transistor 121 is connected to the output terminal 113 and one terminal of the capacitor 161 . The other terminal of the capacitor 161 is connected to the ground terminal.

[0030] In addition, a back gate voltage source 109 is connected ...

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Abstract

Provided are a low pass filter circuit having a small output voltage shift caused by a substrate leakage current at high temperature, and a voltage regulator using the low pass filter circuit, which has a small output voltage shift at high temperature. In a low pass filter circuit using a PMOS transistor as a resistive element, a back gate terminal of the PMOS transistor is set to have a higher voltage than a source of the PMOS transistor. Further, in a voltage regulator incorporating the low pass filter circuit to an output of a reference voltage circuit, the voltage of the back gate terminal of the PMOS transistor which is higher than that of the source thereof is generated by the reference voltage circuit.

Description

technical field [0001] The present invention relates to a low-pass filter circuit in a semiconductor integrated circuit, and a voltage regulator including the low-pass filter circuit. Background technique [0002] Electronic devices equipped with high-frequency circuits and wireless devices require low-noise power supplies, and LDO (low dropout voltage) voltage regulators with good noise characteristics are used. Regarding the output noise of the voltage regulator, 1 / f noise generated in the internal reference voltage circuit and resistor thermal noise generated in the resistor divider circuit used to determine the output voltage are the main causes. In recent years, the tendency to use CMOS transistor integrated circuits that consume less current than bipolar transistor integrated circuits has increased in response to the desire to extend the use time of portable electronic devices. However, it is known that CMOS transistor circuits are The 1 / f noise of . Therefore, it is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/567
CPCG05F1/575G05F1/10H03H11/02G05F1/56H03H11/1213
Inventor 坂口薰
Owner SII SEMICONDUCTOR CORP