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a driving device

A driving device and driving circuit technology, which is applied in the field of data transmission, can solve the problems of high and low level changes of the output amplitude, and achieve the effect of stable output amplitude

Active Publication Date: 2019-01-15
LONTIUM SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the present invention provides a driving device to solve the problem in the prior art that the high and low levels of the output amplitude vary greatly for different loads

Method used

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Embodiment Construction

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0037] The invention provides a driving device to solve the problem in the prior art that the high and low levels of the output amplitude vary greatly during the working process.

[0038] Specifically, the driving device such as figure 2 As shown, it includes: a pre-driver circuit 201, a drive circuit 202 whose input end is connected to the output end of the pre-driver circuit 201, an amplitude detection circuit 203 whose input end is connected to the output ...

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Abstract

The invention discloses a driving device, which detects the output amplitude of the output voltage of the output terminal of the driving circuit through an amplitude detection circuit, and adjusts the resistance value of the equal-proportion replica circuit in the same direction according to the output amplitude, and reversely changes the equal-proportion replica circuit. current, so that the current of the drive circuit can be maintained in a reverse change proportional to the current of the equal-proportion replica circuit, and then the output amplitude is adjusted inversely until the output amplitude is adjusted to a preset value, ensuring The stability of the output amplitude is ensured, and the problem in the prior art that the high and low levels of the output amplitude vary greatly for different loads is solved.

Description

technical field [0001] The invention relates to the technical field of data transmission, in particular to a driving device. Background technique [0002] figure 1 It is a traditional MIPI (Mobile Industry Processor Interface) protocol interface drive device, including: a pre-drive circuit 101, a drive circuit 102 and its proportional copy circuit 103, and far end Rterm is the load equivalent resistance of the receiving end. [0003] Taking the impedance of the proportional replica circuit 103 as an example to be 10 times that of the driving circuit 102 for illustration, the proportional replica circuit 103 adjusts the gate voltage Vr of the switch tubes M1 and M2 through negative feedback of an operational amplifier to ensure that Vs_replica=Vs. By the structural characteristics of the equal-scale replica circuit 103, there is Vs_drv=Vs_replica, the current Idrv=10*Ireplica in the drive circuit 102, the output amplitude of the MIPI protocol interface drive device is 200mv,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K19/08
Inventor 陈余陶成陈峰苏进夏洪锋
Owner LONTIUM SEMICON CORP
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