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a transmitter for usb

A transmitter, MOS tube technology, applied in electrical components, logic circuits, pulse technology, etc., can solve the problem that the rise time and fall time cannot be controlled at the same time.

Active Publication Date: 2017-09-29
VERISILICON MICROELECTRONICS SHANGHAI +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of transmitter for USB, be used to solve the intersection of rising edge and falling edge and rising edge of USB low-speed and full-speed transmitter in the prior art. The problem that the control of time and fall time cannot be taken into account at the same time

Method used

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Embodiment Construction

[0033] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

[0034] see figure 1 . It should be noted that the diagrams provided in this embodiment are only schematically illustrating the basic idea of ​​the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the components in actual implementation. Dimensional drawing, the type, quantity and proportion of each component can be changed arbitrarily duri...

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Abstract

The present invention provides a transmitter for USB, comprising: a pre-driver bias circuit, a pre-driver circuit and a driver stage circuit; wherein the pre-driver bias circuit is used to generate a bias signal of the pre-driver circuit, And control the range of the rising edge and falling edge intersection of the driving signal output by the driver stage circuit; the pre-driver circuit is used to receive the data signal and drive the pre-driver of the driver stage circuit by the control output of the bias signal signal; the driver stage circuit is used to receive the pre-drive signal and control the rise time and fall time of the drive signal. The present invention adopts the Miller feedback method to control the rising and falling edges of the signal, so that under different load conditions, the rising time and falling time are between 75 ns and 300 ns; the bias circuit is biased and pre-driven by using process angle and power supply voltage compensation The circuit makes the intersection of the rising edge and the falling edge between 1.3V and 2.0V; the combination of the two can well meet the requirements of the USB2.0 protocol.

Description

technical field [0001] The invention relates to the field of large-scale analog integrated circuit design, in particular to a USB-based low-speed and full-speed transmitter. Background technique [0002] USB (Universal Serial Bus, Universal Serial Bus) is a new interface technology that has been widely used in the PC field in recent years. The USB interface has the characteristics of faster transmission speed, simple interface, convenient application, support for hot plugging, and the ability to connect multiple devices. At present, it has been widely used in various external devices. There are currently three types of USB interfaces: USB1.1 and USB2.0, and USB3.0 that has appeared in recent years. Theoretically, the transmission speed of USB1.1 can reach 12Mbps, while USB2.0 can reach the speed of 480Mbps, and can be backward compatible with USB1.1. [0003] There are three types of traditional USB LFS TX (Low Full Speed ​​Transmit, low-speed and full-speed transmitters)...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K19/094
Inventor 张旻琦黄志忠肖轶苏杰庞振洋
Owner VERISILICON MICROELECTRONICS SHANGHAI