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A level shift circuit with adjustable initial value

A technology for transferring circuits and initial values, which is applied in the fields of logic circuit coupling/interface, logic circuit connection/interface arrangement, etc. using field effect transistors, which can solve the problems of level shifting circuit outputting indeterminate state signals and system uncertainty.

Active Publication Date: 2017-04-12
BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

[0002] In the smart card SOC system, there are often different voltage domains. When signals are switched between voltage domains, the level shift method is often used, but before the input signal and the low voltage domain are not determined, the level shift circuit is often used. Output an indeterminate signal, so that the system is in an uncertain state

Method used

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  • A level shift circuit with adjustable initial value

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Embodiment Construction

[0014] Such as figure 1 As shown, three inverters (INV1, INV2 and INV3) and two switch circuits (IN4, IN5) are included to realize the level shift with simple initial value setting.

[0015] In this circuit, IN represents the digital input signal, VDD represents the low voltage domain voltage, VCC represents the high voltage domain voltage, and OUT represents the output

[0016] The working process of this circuit is as follows. The low-voltage digital signal is input by IN to drive INV1 and IN5 modules. After passing through INV1 module, the signal is reversed to drive IN4 module. The output of IN4 module drives INV2 module. The output of IN5 module drives INV3 module, and the output of INV2 drives INV3 module. At the same time, the output of the INV3 module drives the INV2 module, and the final signal is transferred to the VCC high voltage domain and output by OUT.

[0017] In the sub-module, INV1 is composed of PMOS device M1 and NMOS device M2; INV2 is composed of PMOS de...

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Abstract

Different voltage domains often exist in a smart card SOC system. When signals are switched with one another among the voltage domains, an electrical level transfer method is often used; however, before an input signal or a low voltage domain is determined, an electrical level transfer circuit often outputs unsteady signals, so that the smart card SOC system is caused to to be in an uncertain state. According to the electrical level transfer circuit with a settable initial value, disclosed by the invention, under the condition that the input signal or the low voltage domain signal is undetermined, the electrical level transfer circuit is mainly used for outputting an electric potential of a fixed electrical level so as to enable the smart card SOC system to be in a preset state.

Description

technical field [0001] The invention relates to a level transfer circuit whose initial value can be set. Background technique [0002] In the smart card SOC system, there are often different voltage domains. When signals are switched between voltage domains, the level shift method is often used, but before the input signal and the low voltage domain are not determined, the level shift circuit is often used. Output an indeterminate signal, so that the system is in an uncertain state. Contents of the invention [0003] The invention discloses a design method and circuit of a level transfer circuit whose initial value can be set. The main function is that the level transfer circuit outputs a fixed-level potential when the input signal and the low-voltage domain signal are uncertain. [0004] This paper proposes a level-shifting circuit whose initial value can be set. [0005] This circuit includes five modules INV1, INV2, INV3, IN4 and IN5. INV1 and IN4 are connected to poi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K19/0185
Inventor 刘明磊马华
Owner BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
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