Low-noise pre-amplifier

A preamplifier and amplifier technology, applied in the direction of improving the amplifier to reduce the impact of noise, etc., can solve the problems of being easily interfered by high-frequency sound signals, high energy consumption, complex structure, etc., to achieve improved anti-interference, low energy consumption, The effect of simple structure

Inactive Publication Date: 2015-05-20
CHENGDU LONGTENG ZHONGYUAN INFORMATION TECHCO
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Traditional preamplifiers are susceptible to noise interference, especially high-frequency

Method used

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  • Low-noise pre-amplifier

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Embodiment Construction

[0009] The present invention will be further described below in conjunction with accompanying drawing:

[0010] Such as figure 1 As shown, a low-noise preamplifier of the present invention includes a power supply E, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7, eighth resistor R8, ninth resistor R9, tenth resistor R10, eleventh resistor R11, first capacitor C1, second capacitor C2, third capacitor C3, fourth capacitor C4, fifth capacitor C5, sixth Capacitor C6, seventh capacitor C7, eighth capacitor C8, ninth capacitor C9, first N-channel field effect transistor Q1, second N-channel field effect transistor Q2 and integrated operational amplifier IC, the positive pole of the power supply E and the first resistor R1 The first terminal of the power supply E is connected to the first terminal of the fifth resistor R5, and the second terminal of the first resistor R1 is res...

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Abstract

The invention discloses a low-noise pre-amplifier. The low-noise pre-amplifier comprises a power supply, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a first N-channel field-effect transistor, a second N-channel field-effect transistor, an integrated operational amplifier, a low-pass filter composed of the eleventh resistor, the eighth capacitor, the ninth capacitor and the tenth resistor and a differential amplifier composed of the first N-channel field-effect transistor and the second N-channel field-effect transistor. The low-noise pre-amplifier is provided with the low-pass filter composed of the eleventh resistor, the eighth capacitor, the ninth capacitor and the tenth resistor, so high-frequency signals among acoustical signals can be filtered out; moreover, the high-quality low-noise N-channel field-effect transistors are selected for the pre-amplifier, so that the anti-interference performance of the pre-amplifier is improved.

Description

technical field [0001] The invention relates to an amplifier, in particular to a low-noise preamplifier. Background technique [0002] The preamplifier can amplify the audio signal to the input range that the power amplifier can accept. There are two functions of the preamplifier: one is to select the required audio source signal and amplify the preamplifier to the rated level; Various sound quality controls to beautify the sound. Traditional preamplifiers are susceptible to noise interference, especially to high-frequency sound signals, and have the disadvantages of complex structure and high energy consumption. Contents of the invention [0003] The object of the present invention is to provide a low-noise preamplifier in order to solve the above problems. [0004] In order to achieve the above object, the present invention adopts the following technical solutions: [0005] A low-noise preamplifier, including a power supply, a first resistor, a second resistor, a thir...

Claims

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Application Information

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IPC IPC(8): H03F1/26
Inventor 樊勇龙宁
Owner CHENGDU LONGTENG ZHONGYUAN INFORMATION TECHCO
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