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Power supply equipment, processing chip for digital microphone and digital microphone

A technology for digital microphones and power supply equipment, applied in the direction of microphone structure associations, electrical components, transducer circuits, etc., can solve the problem of low PSRR

Active Publication Date: 2011-04-06
KTMICRO ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For the processing chip 12, the higher the PSRR of the power supply module 121, the better, but when the power supply module 121 uses an LDO, its PSRR is still low, and there is no solution for a power supply module with higher PSRR in the prior art

Method used

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  • Power supply equipment, processing chip for digital microphone and digital microphone
  • Power supply equipment, processing chip for digital microphone and digital microphone
  • Power supply equipment, processing chip for digital microphone and digital microphone

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no. 1 example

[0016] Such as image 3 As shown, it is a schematic structural diagram of the first embodiment of the power supply device of the present invention, which may include at least two LDOs 31, 32, . . . 3n connected in series, where n is a natural number greater than or equal to 2. The structure of each LDO can be found in figure 2 The circuit diagram shown will not be repeated here.

[0017] The PSRR of the power supply equipment is calculated by the following formula:

[0018] PSRR = 20 log ΔV ddn ΔV dd = 20 log ΔV dd 1 ΔV dd · ΔV dd 2 ΔV dd 1 · . ...

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Abstract

The invention relates to a power supply equipment, a processing chip for a digital microphone and the digital microphone. The power supply equipment contains at least two low dropout linear regulators which are connected in series. The processing chip for the digital microphone contains a processing module and a power supply module, wherein the power supply module contains at least two low dropout linear regulators which are connected in series. The digital microphone contains a microphone and the processing chip, wherein the processing chip contains the processing module and the power supply module which contains at least two serial low dropout linear regulators. The invention can provide the power supply equipment with higher power supply rejection ratio (PSRR).

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to a power supply device, a processing chip for a digital microphone and the digital microphone. Background technique [0002] A digital microphone is a microphone electro-acoustic component that directly outputs a digital pulse signal. Digital microphones have the advantages of strong anti-interference ability, high integration, and ease of use, and are widely used in portable devices that are sensitive to power consumption and volume. [0003] Such as figure 1 Shown is a schematic structural diagram of a digital microphone in the prior art, which may include a microphone 11 and a processing chip 12 , and the processing chip 12 may include a power supply module 121 and a processing module 122 . Wherein, the microphone 11 converts the sound signal into an analog electrical signal and sends it to the processing chip 12, and the processing module 122 in the processing chip 12 ampl...

Claims

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Application Information

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IPC IPC(8): H04R1/08H04R3/00
CPCH04R1/04
Inventor 白蓉蓉王建庭菅端端王文静曹靖
Owner KTMICRO ELECTRONICS
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