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Output driver circuit

A technology for outputting drivers and driver circuits, applied in the direction of logic circuits, instruments, logic circuit connection/interface layout, etc.

Inactive Publication Date: 2009-06-24
MEGACHIPS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] Therefore, even if the feedback control precisely keeps the voltage at the junction at the midpoint of the two resistors 37a and 37b equal to the reference voltage V REF 1. Due to the resistance value nR of the built-in resistors 37a and 37b T / 2 with the resistance value R of the external termination resistor 29 T mismatch between, resulting in an output common-mode voltage V of the differential signal output from the output driver circuit 40 oc change

Method used

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Embodiment Construction

[0031] Hereinafter, an output driver circuit according to the present invention is described in detail with reference to the accompanying drawings.

[0032] figure 1 is a view showing an exemplary embodiment of an output driver circuit according to the present invention. according to figure 1 , the output driver circuit 10 includes a driver circuit 12 , a replica circuit 14 and an operational amplifier 16 at an output final stage. In the figure, the reference voltage V REF 1 and V REF 2 is a constant bias voltage supplied externally. The reference voltage V can be generated using, for example, a bandgap reference circuit integrated in the same LSI chip REF 1 and V REF 2. In the LSI chip, the driver circuit 12 and the replica circuit 14 are integrated. The signals In1 and In2 are differential input signals supplied from a circuit (for example, a pre-driver circuit) in the previous stage.

[0033] At the node that feeds back into the negative input of the operational a...

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Abstract

In an output driver circuit, a replica circuit includes seventh and eighth transistors corresponding to first and second transistors, respectively, ninth and tenth transistors corresponding to third or fifth, and fourth or sixth transistors in a driver circuit, respectively, and a resistor corresponding to a termination resistor. A reference voltage and a voltage of a node between the ninth transistor and the resistor are input to an operational amplifier, and an output signal of the operational amplifier is input to gates of the first and seventh transistors.

Description

technical field [0001] The invention relates to an output driver circuit for outputting differential signals. Background technique [0002] Between the panel timing controller (T-con) and the column driver, several panel internal interface bus standards have been defined and widely used, such as RSDS (Small Swing Differential Signaling), mini-LVDS (Mini Low Voltage Differential Signaling) ), PPDS (point-to-point differential signaling). [0003] In interface bus standards, depending on the application, the output amplitude voltage V of the differential output signal is defined od and the output common-mode voltage V oc Specifications. Such as image 3 shown in, the output amplitude voltage V od is the high-level voltage of the differential output signal V OH and low-level voltage V OL The differential voltage between (|V od |=|V OH |—|V OL |). Output Common Mode Voltage V oc is the high-level voltage of the differential output signal V OH and low-level voltage V ...

Claims

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Application Information

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IPC IPC(8): H03K19/0185G09G3/20
CPCH04L25/0272H04L25/0282H03K19/018564H04B3/00
Inventor 竹内大志
Owner MEGACHIPS