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Fingerprint sensor acquisition unit without excitation signal and BOOST chip

A technology of fingerprint collection and unit structure, which is applied in printing image collection, acquisition/sorting of fingerprints/palmprints, instruments, etc. It can solve the problems of complex peripheral circuits and increased costs, and achieve the effect of simple circuits and low cost

Active Publication Date: 2020-06-30
成都高迈微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After adopting the BOOST chip, the peripheral circuit is more complicated, and the cost has also increased a lot, which also brings certain adverse effects to the stocking

Method used

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  • Fingerprint sensor acquisition unit without excitation signal and BOOST chip
  • Fingerprint sensor acquisition unit without excitation signal and BOOST chip
  • Fingerprint sensor acquisition unit without excitation signal and BOOST chip

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Experimental program
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Embodiment Construction

[0021] figure 1 It is a structural diagram of a conventional fingerprint collection unit. exist figure 1 in, of which, figure 1 (a) is a sectional view, figure 1 (b) is a top view; M3 represents Metal 3, M2_1 and M2_2 represent the second layer of metal, there is a gap between M2_1 and M2_2, Ccal represents the capacitance formed by M3 and M2_1, and Cfb represents the capacitance formed by M3 and M2_2. The size of the plate formed by the combination of M2_1 and M2_2 cannot be smaller than the size of the M3 plate. Generally, in the case of 500dpi, the sum of the sizes of Ccal and Cfb is about 80f, the size of Ccal and Cfb is approximately or in a ratio of 2:1, 3:1, and the minimum Cfb is generally above 20f. When the signal is collected, the output ΔVout of the collected signal satisfies the following relationship:

[0022] ΔVout∝Vboost*Cf / Cfb. (1)

[0023] ∝ means proportional to

[0024] In formula (1), when Cf is packaged in a conventional package (after coating wit...

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Abstract

The invention discloses a fingerprint sensor acquisition unit without an excitation signal and a BOOST chip, is applied to the field of integrated circuits, and aims to solve the problems that after the BOOST chip is adopted in the prior art, a peripheral circuit is relatively complex, the cost is greatly increased, and certain adverse effects are brought to stock. By reducing the physical and circuit implementation modes of the Cfb structure, the influence caused by too small Cfb is eliminated, and fingerprint acquisition without BOOST voltage and peripheral chips is realized.

Description

technical field [0001] The invention belongs to the field of integrated circuits, in particular to a collection unit circuit in a fingerprint sensor collection sensor. Background technique [0002] With the popularization of fingerprint technology, fingerprints gradually transition from the principle of excitation signal acquisition to the principle of no excitation signal acquisition. Now there are two kinds of ordinary acyclic, one is passive fingerprint collection without BOOST chip, and the second is to use BOOST chip. The penetrating power of passive chips is relatively weak, and it is difficult for ESD to meet industry standards. BOOST chips can penetrate relatively thick packages, and ESD can reach industry standards. After adopting the BOOST chip, the peripheral circuit is more complicated, and the cost has also increased a lot, which also brings certain adverse effects to the stocking. Contents of the invention [0003] In order to solve the above technical prob...

Claims

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Application Information

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IPC IPC(8): G06K9/00H03F1/34
CPCH03F1/34G06V40/1306
Inventor 肖建辉
Owner 成都高迈微电子有限公司