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Pre-driver and transmitter using it

A pre-driver and transmitter technology, applied to logic circuits using specific components, logic circuits using semiconductor devices, etc., can solve problems such as the impact of high-speed transmitter signal quality

Inactive Publication Date: 2015-09-09
NOVATEK MICROELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the signal quality of the high-speed transmitter is also affected

Method used

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  • Pre-driver and transmitter using it
  • Pre-driver and transmitter using it
  • Pre-driver and transmitter using it

Examples

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Embodiment Construction

[0030] Please refer to figure 1 , which shows a schematic circuit diagram of a pre-driver according to an embodiment of the present invention. The pre-driver (Pre-driver) 1 can generate a differential output signal in response to a differential input signal. The differential input signal includes a non-inverting input signal component DIP and an inverting input signal component DIN, which are respectively received by the non-inverting input terminal NI+ and the inverting input terminal NI−. The differential output signal includes a non-inverted output signal component VIP and an inverted output signal component VIN, which are respectively output from the non-inverted output terminal NO+ and the inverted output terminal NO−.

[0031] Such as figure 1 As shown, the pre-driver 1 may include a first transistor M1 and a third transistor M3 connected in series, and a second transistor M2 and a fourth transistor M4 connected in series. The first and second transistors M1 and M2 ar...

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Abstract

The invention discloses a pre-driver and a transmitter using the same. The pre-driver comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a first impedance component and a second impedance component, wherein the first transistor is coupled between a first output end and a first node, and the gate of the first transistor is coupled with a first differential input end; the second transistor is coupled between a second differential output end and the first node, and the gate of the second transistor is coupled with a second differential input end; the third transistor is coupled between a first differential output end and a second node, and the gate of the third transistor is coupled with the first differential input end; the fourth transistor is coupled between the second differential output end and the second node, and the gate of the fourth transistor is coupled with the second differential input end; the first impedance component is coupled between the first differential output end and a third node; the second impedance component is coupled between the second differential output end and the third node; and the voltage of the third node is biased into preset voltage.

Description

technical field [0001] The present invention relates to a pre-driver, and in particular to a pre-driver with stable output common-mode voltage and output swing. Background technique [0002] Traditionally, the technology of using a pre-driver in high-speed digital data transmission already exists and is widely used in many different occasions, such as a serial-to-parallel converter (SerDes). In general, the pre-driver is used to provide a more stable input common-mode voltage level, so that a high speed transmitter that cooperates with the pre-driver can have better output signal quality. [0003] However, in the conventional technology, the pre-driver often encounters the dilemma (Trade Off) that the operation speed and the slew rate (Slew Rate) cannot be balanced due to the large output signal swing (Swing). In addition, the rising and falling slew rates of the output signal of the pre-driver are different, the common-mode voltage level is not stable enough, and it is qui...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K19/08
Inventor 许哲豪
Owner NOVATEK MICROELECTRONICS CORP