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Power voltage regulator circuit

A voltage regulator, power supply voltage technology, applied in the field of circuits, to solve problems such as limitations

Active Publication Date: 2016-12-21
AAC ACOUSTIC TECH (SHENZHEN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the output voltage of the power regulator in the related art is a fixed value, and when the microphone amplifier circuit is applied to a battery-powered system, the battery output voltage has a large variation range with time
In order to adapt to battery power supply, the output voltage of the power supply regulator needs to be lower than the minimum voltage of the battery, that is, the voltage when the battery is nearly exhausted, which means that the voltage output range of the microphone amplifier circuit is limited when the new battery is used, That is, the acoustic overload point (Acoustic Overload Point, AOP) of the microphone amplifier circuit is limited

Method used

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] see figure 1 , is the circuit diagram of the power regulator circuit of the present invention. The power supply regulator circuit 10 provided by the present invention includes a first transistor M 1 , the first voltage divider resistor R 1 , the second voltage divider resistor R 2 , Amplifier A 1 and signal processor 1.

[0024] The first transistor M 1 The source of the power supply regulator circuit 10 is connected to the power supply voltage VDD as the input terminal of the power supply regulator circuit 10, and the first transistor M 1 The drain of the power supply regulator circuit 10 is connected to the output voltage V LDO .

[0025] The first divider resistor R 1 connected in series to the first transistor M 1 The drain; the second voltage divider resistor R 2 One end is connected in series to the first voltage dividing resisto...

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Abstract

The invention provides a power voltage regulator circuit comprising a first transistor, a first divider resistance, a second divider resistance, an amplifier and a signal processor; a source electrode of the first transistor is connected to a power supply voltage and a drain electrode of the first transistor is connected to an output voltage. the first divider resistance is in series connection with the drain electrode of the first transistor; one end of the second divider resistance is in series connection with the first divider resistance and the other end is grounded. An in-phase input end of the amplifier is connected between the first divider resistance and the second divider resistance; an anti-phase input end of the amplifier is connected with an output end of the signal processor; an output end of the amplifier is connected with a grid of the first transistor. Compared with related technologies, when the power voltage regulator circuit of the invention is applied to the microphone amplifier, the output voltage can follow the power supply voltage while providing sufficient power supply rejection ratio so as not to limit the output voltage range of the microphone amplifier and the acoustic overload point.

Description

【Technical field】 [0001] The invention relates to a circuit, in particular to a power supply regulator circuit of a microphone amplifier used in MEMS technology. 【Background technique】 [0002] The microphone amplifier circuit mainly includes a MEMS sensor and an ASIC (Application-Specific Integrated Circuit, Application-Specific Integrated Circuit), both of which are electrically connected to convert sound signals into electrical signals to realize the function of the microphone. [0003] In the microphone amplifier circuit of the related art, the power supply rejection ratio (Power Supply Rejection Ratio, PSRR) of the power supply at 217 Hz determines the coupling capability of noise from the power supply to the output. Since the output impedance of the current source is not infinite, the microphone amplifier circuit generally suffers from the problems of high current consumption and low PSRR, which generally can only reach 80dB. In order to reduce noise and improve the s...

Claims

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Application Information

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IPC IPC(8): G05F1/56
CPCG05F1/562
Inventor 韩冬蔡东记戴有祥
Owner AAC ACOUSTIC TECH (SHENZHEN) CO LTD
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