Overcurrent protection circuit of amplifier output stage

An overcurrent protection circuit and amplifier technology, which is applied in the layout of amplifier protection circuits and other directions, can solve the problems of static power consumption and many devices.

Active Publication Date: 2012-07-11
ANYKA (GUANGZHOU) MICROELECTRONICS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide an amplifier output stage overcurrent protection circuit, which aims t

Method used

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  • Overcurrent protection circuit of amplifier output stage
  • Overcurrent protection circuit of amplifier output stage
  • Overcurrent protection circuit of amplifier output stage

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Embodiment Construction

[0010] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0011] figure 1 The circuit modules of the amplifier output stage overcurrent protection circuit provided by the embodiment of the present invention are shown. For the convenience of description, only the parts related to the embodiment of the present invention are shown, and the details are as follows.

[0012] The amplifier output stage overcurrent protection circuit 100 includes a sampling resistor Rs1 and a MOS transistor M3, the first terminal of the sampling resistor Rs1 is connected to the power supply, the second terminal of the sampling resistor Rs1 is connected to the source of the MOS tr...

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Abstract

The invention is suitable for the field of protection circuits and provides an overcurrent protection circuit of an amplifier output stage. In an embodiment of the overcurrent protection circuit, the overcurent protection circuit of the amplifier output stage adopts a switch element, and sampling voltage at two ends of a sampling resistor increases with increase of output current. When the sampling voltage is higher than the starting voltage of the switch element, the switch element is connected, the grid voltage of a metal oxide semiconductor (MOS) tube is pulled to be high, and output current at the output end of the overcurrent protection circuit of the amplifier output stage. The overcurrent protection circuit of the amplifier output stage has the advantages of being less in device and not consuming static power consumption.

Description

technical field [0001] The invention belongs to the field of protection circuits, in particular to an amplifier output stage overcurrent protection circuit. Background technique [0002] The function of the overcurrent protection circuit is to protect the circuit when the output of the circuit is overcurrent, so as to prevent the circuit from being damaged due to the output overcurrent. [0003] The over-current protection circuit is widely used in the output of the amplifier to protect the amplifier. However, the over-current protection circuit of the output stage of a common CMOS amplifier uses many devices and consumes static power consumption. Contents of the invention [0004] The purpose of the embodiments of the present invention is to provide an amplifier output stage overcurrent protection circuit, aiming at solving the problem that the current amplifier output stage overcurrent protection circuit has many components and consumes static power consumption. [0005...

Claims

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Application Information

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IPC IPC(8): H03F1/52
Inventor 杨建明胡胜发
Owner ANYKA (GUANGZHOU) MICROELECTRONICS TECH CO LTD
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