Charge pump device on basis of MEMS (Micro Electro Mechanical System) microphone bias circuit

A technology of bias circuit and charge pump, which is applied in the direction of conversion equipment without intermediate conversion to AC, can solve the problems of high circuit overhead and low conversion efficiency, and achieve the effects of reducing power consumption, improving conversion efficiency and improving voltage gain.

Inactive Publication Date: 2012-11-21
CHANGSHU RES INSTITUE OF NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the loss of the threshold voltage of the MOS tube in the charge pump, the Dickson charge pump often cannot achieve the ideal high output voltage at a low power supply voltage, the circuit overhead is huge, and the conversion efficiency is low

Method used

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  • Charge pump device on basis of MEMS (Micro Electro Mechanical System) microphone bias circuit
  • Charge pump device on basis of MEMS (Micro Electro Mechanical System) microphone bias circuit
  • Charge pump device on basis of MEMS (Micro Electro Mechanical System) microphone bias circuit

Examples

Experimental program
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Effect test

Embodiment Construction

[0015] reference voltage source

[0016] In the application of MEMS microphone, the power supply voltage as low as 1.3V-1.5V is allowed. In this voltage swing range, the reference voltage source can provide a 1.1V reference voltage insensitive to the power supply voltage to ensure the stability of the charge pump output voltage and improve the accuracy of the charge pump output high voltage within the range of 10-12V.

[0017] oscillator

[0018] In the MEMS microphone bias circuit application, based on the consideration of reducing electromagnetic interference and improving power supply efficiency, the selected oscillator outputs a clock signal with a frequency of 250KHZ. The ring oscillator in the oscillator provides a square wave signal with a frequency of 500KHZ. The master-slave RS flip-flop converts this square wave signal into a two-phase non-overlapping initial clock signal ck1 and . This pair of initial clock signals will be converted to an amplitude of 2V by a cl...

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Abstract

The invention discloses a charge pump device on the basis of a MEMS (Micro Electro Mechanical System) microphone bias circuit. The charge pump device comprises an oscillator, a reference voltage source, a clock amplitude doubling circuit, a Dickson charge pump, a low pass filter and the like. The oscillator is used for providing a two-phase non-overlapping clock with the duty cycle of 50 percent and regulating the amplitude of a two-phase non-overlapping clock signal into two times of the amplitude of a reference voltage. According to the invention, a reference voltage and clock amplitude defining circuit is added and can be used for implementing the stable high voltage output; and due to the adoption of a clock amplitude doubling technology, the number of stages of a diode-capacitance voltage unit is reduced by at least four stages, the area of a core circuit of the charge pump is at least shortened by 21 percent, the power consumption is at least reduced by 40 percent and the conversion efficiency is improved by nearly once.

Description

technical field [0001] The invention relates to integrated circuit technology, in particular to the charge pump design of a microphone bias circuit. Background technique [0002] Since J.F. Dickson first proposed the integrated charge pump circuit structure in the chip in 1976, the Dickson charge pump has gradually become the most commonly used DC-DC boost circuit in DRAM, EEPROM and flash memory devices. Due to the loss of the threshold voltage of the MOS tube in the charge pump, the Dickson charge pump often cannot achieve the ideal high output voltage at a low power supply voltage, the circuit overhead is huge, and the conversion efficiency is low. Aiming at these problems, many solutions have been proposed at home and abroad, such as static charge transfer switch technology, PMOS instead of NMOS switch to compensate body effect technology, etc. In the design of a charge pump for biasing a MEMS microphone, some important factors are involved: [0003] (1) Low power cons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/07
Inventor 张震戚湧
Owner CHANGSHU RES INSTITUE OF NANJING UNIV OF SCI & TECH
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