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Input signal state detection and output control circuit and control method

An input signal and state detection technology, applied to multiple input and output pulse circuits, electrical components, pulse processing, etc., can solve problems such as large common-mode voltage deviation and output signal distortion

Pending Publication Date: 2021-05-07
西安翔腾微电子科技有限公司
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Problems solved by technology

[0003] The asymmetric input structure is adopted. When the input signal is a differential signal, due to the influence of the asymmetric resistance, an offset will be introduced to the input signal, and the mismatch voltage will be amplified step by step through the buffer, and the output differential signal will be in common mode under high-frequency operation. The voltage deviation is too large, resulting in serious distortion of the output signal

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  • Input signal state detection and output control circuit and control method

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Embodiment Construction

[0019] An input signal state detection and output control circuit provided by the present invention includes a comparison circuit, a logic AND gate circuit and a two-stage buffer circuit, and the comparison circuit is connected to the two-stage buffer circuit through a logic AND gate circuit.

[0020] The present invention also provides an input signal state detection and output control method, the method includes the following steps:

[0021] 1) The comparison circuit is used to compare the resistance divided voltage value of the differential input signal with the reference voltage, and send it to the logic AND gate circuit;

[0022] 2) The logic AND gate circuit is used to perform logic calculation on the comparison input result, generate a logic control signal det, and send it to the two-stage buffer stage circuit;

[0023] 3) The two-level buffer stage circuit is used to generate corresponding output signals according to different input states. When the input signal is on ...

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Abstract

The invention relates to an input signal state detection and output control circuit and a control method. The circuit comprises a comparison circuit, a logic AND gate circuit and a two-stage buffer stage circuit, wherein the comparison circuit is connected with the two-stage buffer stage circuit through the logic AND gate circuit. Detection and output control of on-state, ground-state and differential-state input signals are achieved, the structure is simple, judgment sensitivity is high, the detection range is wide, signal distortion cannot be introduced, and the circuit can be widely applied to clock / data driving circuits.

Description

technical field [0001] The present invention relates to the field of integrated circuits, in particular to an input signal state detection and output control circuit and control method Background technique [0002] In the clock / data drive system, because the input signal requires the output signal to be in the high and low states when the input signal is in the open state and the ground state, the traditional input receiving stage circuit adopts an asymmetrical input structure. When the input signal is in the open state or the ground state, the high and low state identification is realized through the difference of the pull-up resistor; when the input signal is a differential signal, the input passes through to the clock transmission channel. [0003] The asymmetric input structure is adopted. When the input signal is a differential signal, due to the influence of the asymmetric resistance, an offset will be introduced to the input signal, and the mismatch voltage will be am...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K5/24
CPCH03K5/2481H03K5/249
Inventor 刘颖田泽吕俊盛李嘉邵刚刘敏侠
Owner 西安翔腾微电子科技有限公司