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Signal conversion circuit and fingerprint identification system

A technology of signal conversion and fingerprint recognition, applied in the direction of code conversion, analog-to-digital converter, analog-to-digital conversion, etc., can solve the problems of high power consumption, increased production cost, etc., and achieve the effect of small circuit area and simple circuit structure

Inactive Publication Date: 2016-01-27
SHENZHEN GOODIX TECH CO LTD
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Problems solved by technology

In the conventional technology, the pixel output signal passes through an analog-to-digital converter (AnalogtoDigitalConvertor, ADC) to convert the analog pixel output signal into a digital signal. production cost, and consumes higher power

Method used

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  • Signal conversion circuit and fingerprint identification system
  • Signal conversion circuit and fingerprint identification system

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Embodiment Construction

[0025] 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.

[0026] Please refer to figure 1 , figure 1 It is a schematic diagram of a signal conversion circuit 10 according to an embodiment of the present invention. The signal conversion circuit 10 is used to convert the first analog signal VA into a first digital signal VD1 . The signal conversion circuit 10 includes a comparator 100 , a counter 102 and a reference voltage generator 104 . The comparator 100 includes a negative input terminal (marked with "-"), a positive input terminal (marked with "+") and an output terminal, the positive input terminal is used to receive the first analog signal VA, and...

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Abstract

The invention provides a signal conversion circuit and a fingerprint identification system. The signal conversion circuit is used for generating a first digital signal according to a first analog signal. The signal conversion circuit comprises a comparator and a counter, wherein the comparator comprises a first input end for receiving the first analog signal, a second input end which is connected to a reference voltage generator and used for receiving a reference voltage, and an output end for outputting a second digital signal; and the counter is connected to the output end, and used for generating the first digital signal. The signal conversion circuit provided by the invention has the advantages of simple circuit structure, small circuit area, low cost and low power consumption.

Description

technical field [0001] The invention relates to a signal conversion circuit and a fingerprint identification system, in particular to a signal conversion circuit and a fingerprint identification system with a simple circuit structure. Background technique [0002] With the rapid development of technology, more and more portable electronic devices such as mobile phones, digital cameras, tablet computers, and notebook computers have become necessary tools in people's lives. Because portable electronic devices are generally used by individuals and have a certain degree of privacy, the data stored in them, such as phonebooks, photos, personal information, etc., are privately owned. Once the electronic device is lost, the data may be used by others, causing unnecessary losses. Although there is currently a password protection method to prevent the electronic device from being used by others, the password is easy to leak or be cracked, and has low security. Moreover, the user ne...

Claims

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Application Information

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IPC IPC(8): H03M1/12G06K9/00
CPCH03M1/56G06V40/1306H03M1/34G06V40/12G06V40/1376G06V40/1359H03M1/001H03M1/002H03M1/148H03M1/368
Inventor 谭波詹昶
Owner SHENZHEN GOODIX TECH CO LTD
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