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A power amplifier

A technology of power amplification and power amplifier, which is applied in measuring devices, instruments, measuring circuits, etc., can solve the problems of voltage reduction, noise improvement, and resolution degradation, etc., and achieve the effects of noise reduction, high-efficiency work, and high performance

Active Publication Date: 2018-01-23
缪小忠
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a power amplification device, which can solve the current problems of expanding the output current range, reducing the voltage, degrading the resolution, and increasing the noise.

Method used

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  • A power amplifier

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Embodiment

[0024] Embodiment: a schematic diagram of a comparison circuit, the comparison circuit is composed of a differential circuit and a current mirror circuit. The transistor, transistor, and current source resistor configuration form a differential circuit. A current mirror circuit formed from a transistor configuration.

[0025] When the gate potential of the transistor connected to the resistor and the transistor is higher than the gate potential of the transistor connected to the power supply, the amount of current flowing to the transistor becomes larger than the amount of current flowing to the transistor, resulting in a sufficiently large size of the transistor and a fuse connected to output terminal, the fuse can be melted by the output current of the transistor.

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PUM

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Abstract

The invention discloses a power amplification device. The device comprises a current detection circuit and a current mirror circuit, which are connected in parallel. The current detection circuit is connected in series with a first power amplifier and a second power amplifier in sequence. The current mirror circuit comprises a first transistor and a second transistor, which are connected in series. The current detection circuit is used for detecting the magnitude and power of the input current. The output current of the second power amplifier changes with the change of input power. The obtained power amplification device is high in efficiency and linearity, easy to integrate and low in cost and the like.

Description

technical field [0001] The invention relates to the field of semiconductors, in particular to a power amplification device. Background technique [0002] In the existing technical field, many photoelectric conversion devices that are usually used to detect electromagnetic waves are known, for example, a photosensor with sensitivity in the photoelectric radiation region with sensitivity in the range of ultraviolet to infrared rays is specifically made into a visible light sensor, a large number of The visible light sensor of the company is applied to adjust the brightness or turn on and off the control device according to the living environment of the people. [0003] In such a sensing device, a photodiode is used for a sensing part, and an output current of the photodiode is amplified in an amplifier circuit. [0004] At present, there are problems that expanding the range of the output current will reduce the voltage, degrade the resolution, and increase the noise. Conte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J1/44
CPCG01J1/44G01J2001/4473
Inventor 钟传新
Owner 缪小忠