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Power supply signal generation device and control method thereof

A technology for generating devices and electrical signals, which is applied to electrical components, electronic switches, instruments, etc., and can solve problems such as communication errors, large burr noises in power supply signals, etc.

Active Publication Date: 2016-11-16
CHIPONE TECH BEIJINGCO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in the actual passive capacitive fingerprint recognition system, due to the increase of the excitation signal amplitude and the influence of many factors such as parasitic inductance, parasitic capacitance and parasitic resistance, the provided The power supply signal of the fingerprint sensor will have a large glitch noise, which may even cause communication errors

Method used

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  • Power supply signal generation device and control method thereof
  • Power supply signal generation device and control method thereof
  • Power supply signal generation device and control method thereof

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Embodiment Construction

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Apparently, the described embodiments are some of the embodiments of the present disclosure, but not all of them. Based on the described embodiments of the present disclosure, all other embodiments obtained by persons of ordinary skill in the art without creative effort fall within the protection scope of the present disclosure.

[0043] figure 1 An example structure diagram of a passive capacitive fingerprint identification system 100 is shown. like figure 1 As shown, the passive capacitive fingerprint identification system 100 includes a fingerprint sensor module 101 and a power supply module 102 . The power supply module 102 is connected to the system powe...

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Abstract

The invention provides a power supply signal generation device of a passive capacitor fingerprint recognition system and a control method thereof. The power supply signal generation device comprises a first switch module and a second switch module which are connected between a voltage rise node and a system ground voltage node in series; and a third switch module and a capacitor which are connected between a node and a system power supply voltage node in series. The node is arranged between the first switch module and the second switch module. The first switch module comprises N first switch units connected in parallel. Each first switch unit comprises a first transistor and a first resistor which are connected in series. The second switch module comprises N second switch units which correspond to the N first switch units and are connected in parallel. Each second switch unit comprises a second transistor and a second resistor. The third switch module comprises a third transistor. Through arrangement of at least one switch unit comprising the transistor and the resistor, the noise in a power supply voltage signal generated in the power supply signal generation device can be reduced.

Description

technical field [0001] The present disclosure relates to the field of fingerprint identification, and in particular, relates to a power supply signal generating device and a control method of a passive capacitive fingerprint identification system. Background technique [0002] Capacitive fingerprint recognition technology can be divided into active capacitive fingerprint recognition and passive capacitive fingerprint recognition according to whether the excitation signal is directly applied to the finger. The principle of active capacitive fingerprint recognition is mainly to apply an excitation signal to the finger to enhance the charge on the surface of the finger, and use the sensing array of the touch panel to receive the electric field signal and amplify the signal. Due to the inconsistency of the fingerprint, the induced electric field is also inconsistent. This extracts fingerprint information. The working principle of the passive type is to obtain fingerprint inform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/687G06K9/00
CPCH03K17/6871G06V40/1306
Inventor 李卓赵帆
Owner CHIPONE TECH BEIJINGCO LTD
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