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Signal receiving circuit

A signal reception and signal technology, applied in logic circuits, electrical components, pulse technology, etc.

Active Publication Date: 2015-09-09
BRITE SEMICON SHANGHAI CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Similarly, low-voltage devices will encounter the same problems and challenges when receiving and sending high-voltage signals

Method used

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Embodiment Construction

[0024] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] Reference herein to "one embodiment" or "an embodiment" refers to a particular feature, structure or characteristic that can be included in at least one implementation of the present invention. "In one embodiment" appearing in different places in this specification does not all refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments. Unless otherwise specified, the words connected, connected, and joined in this document mean that they are electrically connected directly or indirectly.

[0026] figure 1 It is a functional block diagram circuit schematic diagram of a signal receiving circuit.

[0027] The signal receiving circuit includes a differential in...

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Abstract

The invention provides a signal receiving circuit. The signal receiving circuit includes a differential input unit, a first current comparison unit and a second current comparison unit; the differential input unit is used for receiving an inputted pair of voltage differential signals, and generates a first pair of current differential signals according to the inputted pair of voltage differential signals when the voltage of the inputted pair of voltage differential signals is higher than a first preset threshold value, and at least generates a second pair of current differential signals based on the voltage of this pair of voltage differential signals when the voltage of the first voltage differential signal and / or the second first voltage differential signal is lower than the first preset threshold value; the first current comparison unit and the second current comparison unit respectively compare the first pair of current differential signals and the second pair of current differential signals, and obtain comparison results; signal judgment on the inputted pair of voltage differential signals can be obtained through integrating the comparison results; the differential voltage of this pair of voltage differential signals is higher than the withstand voltage of devices in the first current comparison unit, the second current comparison unit and the differential input unit; and therefore, low-withstand voltage devices can be adopted to receive voltage signals.

Description

【Technical field】 [0001] The invention relates to the technical field of circuit design, in particular to a signal receiving circuit, which can receive a voltage differential signal whose signal amplitude exceeds the withstand voltage of the internal device. 【Background technique】 [0002] As the size of transistors continues to shrink, the supply voltage is also reduced proportionally. Traditional I / O (input / output) voltages have dropped from above 5v to 3.3v and 1.8v. Take USB2.0 (Universal Serial Bus) as an example. It is the most common interface in consumer electronics products. In order to be backward compatible with the USB1.1 standard, USB2.0 must have the ability to send and receive USB1. .1 Function of the specified full-speed and low-speed signals. In the most advanced semiconductor manufacturing process of 28nm and below, 1.8v transistors are generally used as devices for interface circuits. The voltage difference between the four terminals (source, gate, drai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K19/094
Inventor 周玉镇魏来戴颉李耿民职春星
Owner BRITE SEMICON SHANGHAI CORP
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