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Ocd driver system with controllable slew rate and related method

An off-chip driver and slew rate technology, applied in electronic switches, reliability improvement and modification, electrical components, etc., can solve problems such as no way to compensate for changes, slew rate changes, delay changes, etc.

Active Publication Date: 2010-10-06
NAN YA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problem with the constant current and constant voltage methods is that there is no way to compensate for variations caused by process, temperature or supply voltage; for the time delay method, due to the large variation in delay under different process, temperature or supply voltage , the slew rate will vary greatly due to these delay changes

Method used

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  • Ocd driver system with controllable slew rate and related method
  • Ocd driver system with controllable slew rate and related method

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Embodiment Construction

[0018] Certain terms are used throughout the specification and following claims to refer to particular components. Those of ordinary skill in the art will appreciate that hardware manufacturers may refer to the same component by different terms. This description and the following claims do not use the difference in name as a way to distinguish components, but use the difference in function of components as a criterion for distinguishing. "Includes" mentioned throughout the specification and the following claims is an open-ended term, so it should be interpreted as "including but not limited to". In addition, the term "coupled" herein includes any direct and indirect means of electrical connection. Therefore, if it is described that a first device is coupled to a second device, it means that the first device may be directly electrically connected to the second device, or indirectly electrically connected to the second device through other devices or connection means.

[0019]...

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Abstract

An off-chip driver (OCD) includes: a logic circuit, for providing a logic signal input; a pre-driver stage, coupled to the logic circuit, for providing a ramped up voltage in response to the logic signal input; a final driver stage, coupled to the pre-driver stage, for providing an output voltage in response to the ramped up voltage; and a bias circuit, coupled to the pre-driver stage, for providing a constant bias voltage to the pre-driver stage, wherein the constant bias voltage keeps the pre-driver stage within an operational range to compensate for variations in process, temperature and supply voltage.

Description

technical field [0001] The present invention relates to an off-chip driver (Off-Chip driver, OCD), in particular to an off-chip driver capable of compensating variations in process, temperature and supply voltage. Background technique [0002] The off-chip driver is a well-known circuit in the electronic information industry, and a typical off-chip driver includes at least a pre-driver (Pre-Driver) and a terminal driver (Final Driver), both of which are powered by a supply voltage control. The function of the pre-driver is to control when and how the terminal driver stage is turned on or off, and the turn-on and turn-off rate of the terminal driver can determine the slew rate of the output signal. The slew rate of the output signal (voltage change per unit time (V / ns)) is an important indicator of the quality of the off-chip driver. The slew rate often needs to be kept within a certain range under various conditions. However, because the variation of the process, temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K19/0175
CPCH03K17/164H03K19/00369H03K19/00361
Inventor 帕特·特龙宝来·梅
Owner NAN YA TECH