Level conversion circuit and fingerprint identification device
A technology for converting circuits and levels, applied in logic circuit interface devices, character and pattern recognition, logic circuit connection/interface layout, etc. Low and other problems, to achieve the effect of no static power consumption
Active Publication Date: 2021-03-02
SHENZHEN GOODIX TECH CO LTD
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Problems solved by technology
[0003] However, the traditional level conversion circuit has the problems of high static power consumption and low signal transmission speed, which will affect the overall performance of electronic devices (such as fingerprint recognition devices) using the level conversion circuit.
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[0025] In order to make the object, technical solution and advantages of the present invention clearer, some embodiments of 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] see figure 1 , which is a schematic circuit diagram of a typical high-voltage level conversion circuit. Such as figure 1 As shown, wherein, the high-voltage level conversion circuit includes a MOS (Metal Oxide Semiconductor, Metal Oxide Semiconductor) transistor T1, a MOS transistor T2 and a MOS transistor T9 as an inverter, and a high-voltage MOS transistor T3, a high-voltage MOS transistor T4, a high voltage MOS transistor T5 and a high voltage MOS transistor T6.
[0027] when figure 1 When the high-voltage level conversion circuit shown is in a static state, since ...
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Some embodiments of the present invention provide a level conversion circuit and a fingerprint identification device. The level conversion circuit includes: a complementary signal generating unit, a high-voltage pulse generating unit, and a switching and latching unit; the high-voltage pulse generating unit is connected to the complementary signal generating unit and the switching and latching unit; the complementary signal generating unit is used to receive The target signal, and output the complementary signal of the target signal and the target signal; the high-voltage pulse generation unit is used to generate high-voltage pulses according to the target signal and the complementary signal; the conversion and latch unit is used to convert the target signal from a low-voltage The domain is switched to the high voltage domain, and is used to latch and output the target signal in the high voltage domain. By adopting the embodiment of the invention, the circuit can transmit the target signal at high speed without static power consumption.
Description
technical field [0001] The present application relates to the technical field of circuit design, in particular to a level conversion circuit and a fingerprint recognition device using the above-mentioned level conversion circuit. Background technique [0002] In electronic circuit design, the problem of different input and output logic voltage domains often occurs inside the system, which increases the complexity of system design. For example: when a 1.8V digital circuit communicates with an analog circuit operating at 3.3V, it is necessary to solve the conversion problem of two levels. At this time, it is necessary to use a level conversion circuit to achieve level conversion. Conversion circuits are also called level shifters. [0003] However, the traditional level conversion circuit has the problems of high static power consumption and low signal transmission speed, which will affect the overall performance of electronic devices (such as fingerprint identification devic...
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IPC IPC(8): H03K19/0185H03K19/0175G06K9/00
CPCH03K19/017509H03K19/018521G06V40/1306H03K19/0013H03K19/018507
Inventor 李博
Owner SHENZHEN GOODIX TECH CO LTD