Low Noise Low Voltage Differential Signal Transmitter

A low-voltage differential signal, differential signal technology, applied in differential amplifiers, improved amplifiers to reduce noise effects, DC-coupled DC amplifiers, etc., can solve problems such as affecting common-mode levels, improve matching, and reduce common-mode noise. , the effect of reducing the impact
CN104539251BActive Publication Date: 2017-05-10BRITE SEMICON SHANGHAI CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BRITE SEMICON SHANGHAI CORP
Publication Date
2017-05-10

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Abstract

The invention provides a low-voltage differential signal transmitter. The low-voltage differential signal transmitter comprises transistors MP0, M1, M2, M3, M4, MN0, divider resistors R1 and R2, a transconductance amplifier, transistors MP6, MN5 and MN6 and a compensation capacitor C0, wherein the divider resistors R1 and R2 and a load resistor RT are connected at a first output end OUTP and a second output end OUTN in series, the transconductance amplifier comprises a transistor MP3, the first input end of the transconductance amplifier is connected with intermediate nodes of the divider resistors R1 and R2, the second input end of the transconductance amplifier is connected with VREF, and the output end of the transconductance amplifier is connected with a gate of the transistor MN0. The divider resistors R1 and R2, the compensation capacitor C0, the transconductance amplifier and the transistors MP6, MN5, MN6 and MN0 form a common-mode feedback circuit. Because zero points are added to the transistors MP6, MN5, MN6 and MN0 and loop compensation is achieved, a coupled access where a compensation resistor R0 and the compensation capacitor C0 are located in the prior art is avoided, and common-mode noise is lowered.
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Description

[0001] 【Technical Field】

[0002] The invention relates to the field of circuit design, in particular to a low-noise low-voltage differential signal transmitter.

[0003] 【Background technique】

[0004] With the development of semiconductor and computer technology, the clock frequency on integrated circuit chips has reached GHz. The demand for high-speed data transmission rates between chips is far greater than Gb / s. LVDS (Low Voltage Differential Signaling) is a low-swing differential signal technology, which has the characteristics of high data transmission speed, low noise and low power consumption, and is widely used in the field of high-speed digital interfaces.

[0005] In actual design, there are many undesirable factors (such as incompletely matched terminal resistance, transmission line effects, noise) that affect the performance of the driver. The traditional low-voltage differential signal transmitter is affected by the non-ideality of the switch and the common mode feedba...

Claims

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