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LIN transmitter with semi-open loop control

A transmitter and control signal technology, applied in the field of transmitters, can solve the problems of unmeasurable performance improvement and circuit complexity of transmitters, and achieve the effects of improving RF and EMI performance characteristics, simple design, and good immunity

Active Publication Date: 2016-06-15
STMICROELECTRONICS (SHENZHEN) R&D CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practice, however, circuit complexity becomes an issue, and practical implementations of DAC-controlled transmitters fail to measurably improve performance

Method used

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  • LIN transmitter with semi-open loop control
  • LIN transmitter with semi-open loop control
  • LIN transmitter with semi-open loop control

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] The transmitter / driver structure proposed by the present invention is in figure 1 (a schematic diagram of the transmitter and a block diagram of the control and switching circuits) and figure 2 ( figure 1 A schematic diagram of the control circuit shown).

[0014] figure 1 The following abbreviations are used in:

[0015] VBAT is the power supply for the LIN transmitter.

[0016] V3V_DRIVER is the internal 3V power supply for the LIN transmitter.

[0017] GND_DRIVER is used to reference the ground of the transmitter.

[0018] M0 is an NMOS4 transistor.

[0019] NMOS4 transistors have a large aspect ratio.

[0020] M1 to M4 are NDMOS65V transistors.

[0021] In order to achieve good EMI performance, when POWER_GATE is lower than the threshold voltage of transistor M6, the operation switching of POWER_GATE must be completed. The output of the detector of transistor M0 is referred to as "VTHL" (below threshold). NDMOS transistors have a threshold of about 0.86 v...

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PUM

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Abstract

The invention relates to a half-open ring control local interconnection network (LIN) emitter, and provides an LIN emitter. The LIN emitter comprises a current mirror which is coupled to an emission output node, and a control circuit which is coupled to an emission input node and is used for controlling the current mirror by virtue of various load current control signals.

Description

technical field [0001] The present invention relates to transmitters, and more particularly to LIN (Local Area Internet) transmitters. Background technique [0002] In the prior art, there are three conventional structures for LIN transmitters: closed-loop controlled transmitters; open-loop controlled transmitters; and DAC (Digital to Analog Converter) controlled transmitters. [0003] In general, closed-loop controlled transmitters of the prior art exhibit good EMI (electromagnetic interference) characteristics, but poor immunity to RF (radio frequency). Closed-loop controlled transmitters use feedback in their design. However, as a rule, the use of feedback has been prohibited in later designs of LIN transmitters, since the use of feedback may cause undesired operation. [0004] An open-loop controlled transmitter has better RF immunity but poorer EMI characteristics than a closed-loop controlled transmitter. [0005] DAC-controlled transmitters are a variation of open-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/04
Inventor 曾妮
Owner STMICROELECTRONICS (SHENZHEN) R&D CO LTD